What are advantages of Artificial Neural Networks over Support Vector Machines?
Judging from the examples you provide, I'm assuming that by ANNs, you mean multilayer feed-forward networks (FF nets for short), such as multilayer perceptrons, because those are in direct competition with SVMs.
One specific benefit that these models have over SVMs is that their size is fixed: they are parametric models, while SVMs are non-parametric. That is, in an ANN you have a bunch of hidden layers with sizes h1 through hn depending on the number of features, plus bias parameters, and those make up your model. By contrast, an SVM (at least a kernelized one) consists of a set of support vectors, selected from the training set, with a weight for each. In the worst case, the number of support vectors is exactly the number of training samples (though that mainly occurs with small training sets or in degenerate cases) and in general its model size scales linearly. In natural language processing, SVM classifiers with tens of thousands of support vectors, each having hundreds of thousands of features, is not unheard of.
Also, online training of FF nets is very simple compared to online SVM fitting, and predicting can be quite a bit faster.
EDIT: all of the above pertains to the general case of kernelized SVMs. Linear SVM are a special case in that they are parametric and allow online learning with simple algorithms such as stochastic gradient descent.
What is the right way to populate a DropDownList from a database?
((TextBox)GridView1.Rows[e.NewEditIndex].Cells[3].Controls[0]).Enabled = false;
Git fails when pushing commit to github
I had the same issue and believe that it has to do with the size of the repo (edited- or the size of a particular file) you are trying to push.
Basically I was able to create new repos and push them to github. But an existing one would not work.
The HTTP error code seems to back me up it is a 'Length Required' error. So maybe it is too large to calc or greated that the max. Who knows.
EDIT
I found that the problem may be files that are large. I had one update that would not push even though I had successful pushes up to that point. There was only one file in the commit but it happened to be 1.6M
So I added the following config change
git config http.postBuffer 524288000To allow up to the file size 500M and then my push worked. It may have been that this was the problem initially with pushing a big repo over the http protocol.
END EDIT
the way I could get it to work (EDIT before I modified postBuffer) was to tar up my repo, copy it to a machine that can do git over ssh, and push it to github. Then when you try to do a push/pull from the original server it should work over https. (since it is a much smaller amount of data than an original push).
How to properly create an SVN tag from trunk?
You are correct in that it's not "right" to add files to the tags folder.
You've correctly guessed that copy is the operation to use; it lets Subversion keep track of the history of these files, and also (I assume) store them much more efficiently.
In my experience, it's best to do copies ("snapshots") of entire projects, i.e. all files from the root check-out location. That way the snapshot can stand on its own, as a true representation of the entire project's state at a particular point in time.
This part of "the book" shows how the command is typically used.
Going through a text file line by line in C
So many problems in so few lines. I probably forget some:
- argv[0] is the program name, not the first argument;
- if you want to read in a variable, you have to allocate its memory
- one never loops on feof, one loops on an IO function until it fails, feof then serves to determinate the reason of failure,
- sscanf is there to parse a line, if you want to parse a file, use fscanf,
- "%s" will stop at the first space as a format for the ?scanf family
- to read a line, the standard function is fgets,
- returning 1 from main means failure
So
#include <stdio.h>
int main(int argc, char* argv[])
{
char const* const fileName = argv[1]; /* should check that argc > 1 */
FILE* file = fopen(fileName, "r"); /* should check the result */
char line[256];
while (fgets(line, sizeof(line), file)) {
/* note that fgets don't strip the terminating \n, checking its
presence would allow to handle lines longer that sizeof(line) */
printf("%s", line);
}
/* may check feof here to make a difference between eof and io failure -- network
timeout for instance */
fclose(file);
return 0;
}
How to modify memory contents using GDB?
Expanding on the answers provided here.
You can just do set idx = 1 to set a variable, but that syntax is not recommended because the variable name may clash with a set sub-command. As an example set w=1 would not be valid.
This means that you should prefer the syntax: set variable idx = 1 or set var idx = 1.
Last but not least, you can just use your trusty old print command, since it evaluates an expression. The only difference being that he also prints the result of the expression.
(gdb) p idx = 1
$1 = 1
You can read more about gdb here.
Flask raises TemplateNotFound error even though template file exists
You must create your template files in the correct location; in the templates subdirectory next to the python module (== the module where you create your Flask app).
The error indicates that there is no home.html file in the templates/ directory. Make sure you created that directory in the same directory as your python module, and that you did in fact put a home.html file in that subdirectory. If your app is a package, the templates folder should be created inside the package.
myproject/
app.py
templates/
home.html
myproject/
mypackage/
__init__.py
templates/
home.html
Alternatively, if you named your templates folder something other than templates and don't want to rename it to the default, you can tell Flask to use that other directory.
app = Flask(__name__, template_folder='template') # still relative to module
You can ask Flask to explain how it tried to find a given template, by setting the EXPLAIN_TEMPLATE_LOADING option to True. For every template loaded, you'll get a report logged to the Flask app.logger, at level INFO.
This is what it looks like when a search is successful; in this example the foo/bar.html template extends the base.html template, so there are two searches:
[2019-06-15 16:03:39,197] INFO in debughelpers: Locating template "foo/bar.html":
1: trying loader of application "flaskpackagename"
class: jinja2.loaders.FileSystemLoader
encoding: 'utf-8'
followlinks: False
searchpath:
- /.../project/flaskpackagename/templates
-> found ('/.../project/flaskpackagename/templates/foo/bar.html')
[2019-06-15 16:03:39,203] INFO in debughelpers: Locating template "base.html":
1: trying loader of application "flaskpackagename"
class: jinja2.loaders.FileSystemLoader
encoding: 'utf-8'
followlinks: False
searchpath:
- /.../project/flaskpackagename/templates
-> found ('/.../project/flaskpackagename/templates/base.html')
Blueprints can register their own template directories too, but this is not a requirement if you are using blueprints to make it easier to split a larger project across logical units. The main Flask app template directory is always searched first even when using additional paths per blueprint.
Create instance of generic type whose constructor requires a parameter?
It is still possible, with high performance, by doing the following:
//
public List<R> GetAllItems<R>() where R : IBaseRO, new() {
var list = new List<R>();
using ( var wl = new ReaderLock<T>( this ) ) {
foreach ( var bo in this.items ) {
T t = bo.Value.Data as T;
R r = new R();
r.Initialize( t );
list.Add( r );
}
}
return list;
}
and
//
///<summary>Base class for read-only objects</summary>
public partial interface IBaseRO {
void Initialize( IDTO dto );
void Initialize( object value );
}
The relevant classes then have to derive from this interface and initialize accordingly. Please note, that in my case, this code is part of a surrounding class, which already has <T> as generic parameter. R, in my case, also is a read-only class. IMO, the public availability of Initialize() functions has no negative effect on the immutability. The user of this class could put another object in, but this would not modify the underlying collection.
IEnumerable vs List - What to Use? How do they work?
IEnumerable describes behavior, while List is an implementation of that behavior. When you use IEnumerable, you give the compiler a chance to defer work until later, possibly optimizing along the way. If you use ToList() you force the compiler to reify the results right away.
Whenever I'm "stacking" LINQ expressions, I use IEnumerable, because by only specifying the behavior I give LINQ a chance to defer evaluation and possibly optimize the program. Remember how LINQ doesn't generate the SQL to query the database until you enumerate it? Consider this:
public IEnumerable<Animals> AllSpotted()
{
return from a in Zoo.Animals
where a.coat.HasSpots == true
select a;
}
public IEnumerable<Animals> Feline(IEnumerable<Animals> sample)
{
return from a in sample
where a.race.Family == "Felidae"
select a;
}
public IEnumerable<Animals> Canine(IEnumerable<Animals> sample)
{
return from a in sample
where a.race.Family == "Canidae"
select a;
}
Now you have a method that selects an initial sample ("AllSpotted"), plus some filters. So now you can do this:
var Leopards = Feline(AllSpotted());
var Hyenas = Canine(AllSpotted());
So is it faster to use List over IEnumerable? Only if you want to prevent a query from being executed more than once. But is it better overall? Well in the above, Leopards and Hyenas get converted into single SQL queries each, and the database only returns the rows that are relevant. But if we had returned a List from AllSpotted(), then it may run slower because the database could return far more data than is actually needed, and we waste cycles doing the filtering in the client.
In a program, it may be better to defer converting your query to a list until the very end, so if I'm going to enumerate through Leopards and Hyenas more than once, I'd do this:
List<Animals> Leopards = Feline(AllSpotted()).ToList();
List<Animals> Hyenas = Canine(AllSpotted()).ToList();
Why is 22 the default port number for SFTP?
Why is 21 the default port for FTP? Or 80 the default for HTTP? It is a convention.
Simple timeout in java
@Singleton
@AccessTimeout(value=120000)
public class StatusSingletonBean {
private String status;
@Lock(LockType.WRITE)
public void setStatus(String new Status) {
status = newStatus;
}
@Lock(LockType.WRITE)
@AccessTimeout(value=360000)
public void doTediousOperation {
//...
}
}
//The following singleton has a default access timeout value of 60 seconds, specified //using the TimeUnit.SECONDS constant:
@Singleton
@AccessTimeout(value=60, timeUnit=SECONDS)
public class StatusSingletonBean {
//...
}
//The Java EE 6 Tutorial
//https://docs.oracle.com/javaee/6/tutorial/doc/gipvi.html
Convert RGB to Black & White in OpenCV
This seemed to have worked for me!
Mat a_image = imread(argv[1]);
cvtColor(a_image, a_image, CV_BGR2GRAY);
GaussianBlur(a_image, a_image, Size(7,7), 1.5, 1.5);
threshold(a_image, a_image, 100, 255, CV_THRESH_BINARY);
How to bind Events on Ajax loaded Content?
If your ajax response are containing html form inputs for instance, than this would be great:
$(document).on("change", 'input[type=radio][name=fieldLoadedFromAjax]', function(event) {
if (this.value == 'Yes') {
// do something here
} else if (this.value == 'No') {
// do something else here.
} else {
console.log('The new input field from an ajax response has this value: '+ this.value);
}
});
Transpose a matrix in Python
If we wanted to return the same matrix we would write:
return [[ m[row][col] for col in range(0,width) ] for row in range(0,height) ]
What this does is it iterates over a matrix m by going through each row and returning each element in each column. So the order would be like:
[[1,2,3],
[4,5,6],
[7,8,9]]
Now for question 3, we instead want to go column by column, returning each element in each row. So the order would be like:
[[1,4,7],
[2,5,8],
[3,6,9]]
Therefore just switch the order in which we iterate:
return [[ m[row][col] for row in range(0,height) ] for col in range(0,width) ]
SSH to AWS Instance without key pairs
AWS added a new feature to connect to instance without any open port, the AWS SSM Session Manager. https://aws.amazon.com/blogs/aws/new-session-manager/
I've created a neat SSH ProxyCommand script that temporary adds your public ssh key to target instance during connection to target instance. The nice thing about this is you will connect without the need to add the ssh(22) port to your security groups, because the ssh connection is tunneled through ssm session manager.
AWS SSM SSH ProxyComand -> https://gist.github.com/qoomon/fcf2c85194c55aee34b78ddcaa9e83a1
Types in Objective-C on iOS
This is a good overview:
http://reference.jumpingmonkey.org/programming_languages/objective-c/types.html
or run this code:
32 bit process:
NSLog(@"Primitive sizes:");
NSLog(@"The size of a char is: %d.", sizeof(char));
NSLog(@"The size of short is: %d.", sizeof(short));
NSLog(@"The size of int is: %d.", sizeof(int));
NSLog(@"The size of long is: %d.", sizeof(long));
NSLog(@"The size of long long is: %d.", sizeof(long long));
NSLog(@"The size of a unsigned char is: %d.", sizeof(unsigned char));
NSLog(@"The size of unsigned short is: %d.", sizeof(unsigned short));
NSLog(@"The size of unsigned int is: %d.", sizeof(unsigned int));
NSLog(@"The size of unsigned long is: %d.", sizeof(unsigned long));
NSLog(@"The size of unsigned long long is: %d.", sizeof(unsigned long long));
NSLog(@"The size of a float is: %d.", sizeof(float));
NSLog(@"The size of a double is %d.", sizeof(double));
NSLog(@"Ranges:");
NSLog(@"CHAR_MIN: %c", CHAR_MIN);
NSLog(@"CHAR_MAX: %c", CHAR_MAX);
NSLog(@"SHRT_MIN: %hi", SHRT_MIN); // signed short int
NSLog(@"SHRT_MAX: %hi", SHRT_MAX);
NSLog(@"INT_MIN: %i", INT_MIN);
NSLog(@"INT_MAX: %i", INT_MAX);
NSLog(@"LONG_MIN: %li", LONG_MIN); // signed long int
NSLog(@"LONG_MAX: %li", LONG_MAX);
NSLog(@"ULONG_MAX: %lu", ULONG_MAX); // unsigned long int
NSLog(@"LLONG_MIN: %lli", LLONG_MIN); // signed long long int
NSLog(@"LLONG_MAX: %lli", LLONG_MAX);
NSLog(@"ULLONG_MAX: %llu", ULLONG_MAX); // unsigned long long int
When run on an iPhone 3GS (iPod Touch and older iPhones should yield the same result) you get:
Primitive sizes:
The size of a char is: 1.
The size of short is: 2.
The size of int is: 4.
The size of long is: 4.
The size of long long is: 8.
The size of a unsigned char is: 1.
The size of unsigned short is: 2.
The size of unsigned int is: 4.
The size of unsigned long is: 4.
The size of unsigned long long is: 8.
The size of a float is: 4.
The size of a double is 8.
Ranges:
CHAR_MIN: -128
CHAR_MAX: 127
SHRT_MIN: -32768
SHRT_MAX: 32767
INT_MIN: -2147483648
INT_MAX: 2147483647
LONG_MIN: -2147483648
LONG_MAX: 2147483647
ULONG_MAX: 4294967295
LLONG_MIN: -9223372036854775808
LLONG_MAX: 9223372036854775807
ULLONG_MAX: 18446744073709551615
64 bit process:
The size of a char is: 1.
The size of short is: 2.
The size of int is: 4.
The size of long is: 8.
The size of long long is: 8.
The size of a unsigned char is: 1.
The size of unsigned short is: 2.
The size of unsigned int is: 4.
The size of unsigned long is: 8.
The size of unsigned long long is: 8.
The size of a float is: 4.
The size of a double is 8.
Ranges:
CHAR_MIN: -128
CHAR_MAX: 127
SHRT_MIN: -32768
SHRT_MAX: 32767
INT_MIN: -2147483648
INT_MAX: 2147483647
LONG_MIN: -9223372036854775808
LONG_MAX: 9223372036854775807
ULONG_MAX: 18446744073709551615
LLONG_MIN: -9223372036854775808
LLONG_MAX: 9223372036854775807
ULLONG_MAX: 18446744073709551615
Is it possible to run JavaFX applications on iOS, Android or Windows Phone 8?
Desktop: first-class support
Oracle JavaFX from Java SE supports only OS X (macOS), GNU/Linux and Microsoft Windows. On these platforms, JavaFX applications are typically run on JVM from Java SE or OpenJDK.
Android: should work
There is also a JavaFXPorts project, which is an open-source project sponsored by a third-party. It aims to port JavaFX library to Android and iOS.
On Android, this library can be used like any other Java library; the JVM bytecode is compiled to Dalvik bytecode. It's what people mean by saying that "Android runs Java".
iOS: status not clear
On iOS, situation is a bit more complex, as neither Java SE nor OpenJDK supports Apple mobile devices. Till recently, the only sensible option was to use RoboVM ahead-of-time Java compiler for iOS. Unfortunately, on 15 April 2015, RoboVM project was shut down.
One possible alternative is Intel's Multi-OS Engine. Till recently, it was a proprietary technology, but on 11 August 2016 it was open-sourced. Although it can be possible to compile an iOS JavaFX app using JavaFXPorts' JavaFX implementation, there is no evidence for that so far. As you can see, the situation is dynamically changing, and this answer will be hopefully updated when new information is available.
Windows Phone: no support
With Windows Phone it's simple: there is no JavaFX support of any kind.
The model backing the <Database> context has changed since the database was created
I had this issue and it turned out that one project was pointing to SQLExpress but the one with the problem was pointing to LocalDb. (in their respective web.config). Silly oversight but worth noting here in case anyone else is troubleshooting this issue.
Import Python Script Into Another?
It's worth mentioning that (at least in python 3), in order for this to work, you must have a file named __init__.py in the same directory.
Error handling with PHPMailer
This one works fine
use try { as above
use Catch as above but comment out the echo lines
} catch (phpmailerException $e) {
//echo $e->errorMessage(); //Pretty error messages from PHPMailer
} catch (Exception $e) {
//echo $e->getMessage(); //Boring error messages from anything else!
}
Then add this
if ($e) {
//enter yor error message or redirect the user
} else {
//do something else
}
how to run the command mvn eclipse:eclipse
Right click on the project
->Run As --> Run configurations.
Then select Maven Build
Then click new button to create a configuration of the selected type. Click on Browse workspace (now is Workspace...) then select your project and in goals specify eclipse:eclipse
How to add option to select list in jQuery
For me this one worked
success: function(data){
alert("SUCCCESS");
$.each(data,function(index,itemData){
console.log(JSON.stringify(itemData));
$("#fromDay").append( new Option(itemData.lookupLabel,itemData.id) )
});
}
box-shadow on bootstrap 3 container
For those wanting the box-shadow on the col-* container itself and not on the .container, you can add another div just inside the col-* element, and add the shadow to that. This element will not have the padding, and therefor not interfere.
The first image has the box-shadow on the col-* element. Because of the 15px padding on the col element, the shadow is pushed to the outside of the div element rather than on the visual edges of it.
<div class="col-md-4" style="box-shadow: 0px 2px 25px rgba(0, 0, 0, .25);">
<div class="thumbnail">
{!! HTML::image('images/sampleImage.png') !!}
</div>
</div>
The second image has a wrapper div with the box-shadow on it. This will place the box-shadow on the visual edges of the element.
<div class="col-md-4">
<div id="wrapper-div" style="box-shadow: 0px 2px 25px rgba(0, 0, 0, .25);">
<div class="thumbnail">
{!! HTML::image('images/sampleImage.png') !!}
</div>
</div>
</div>
Alternate table row color using CSS?
There is a fairly easy way to do this in PHP, if I understand your query, I assume that you code in PHP and you are using CSS and javascript to enhance the output.
The dynamic output from the database will carry a for loop to iterate through results which are then loaded into the table. Just add a function call to the like this:
echo "<tr style=".getbgc($i).">"; //this calls the function based on the iteration of the for loop.
then add the function to the page or library file:
function getbgc($trcount)
{
$blue="\"background-color: #EEFAF6;\"";
$green="\"background-color: #D4F7EB;\"";
$odd=$trcount%2;
if($odd==1){return $blue;}
else{return $green;}
}
Now this will alternate dynamically between colors at each newly generated table row.
It's a lot easier than messing about with CSS that doesn't work on all browsers.
Hope this helps.
What's the best way to iterate an Android Cursor?
if (cursor.getCount() == 0)
return;
cursor.moveToFirst();
while (!cursor.isAfterLast())
{
// do something
cursor.moveToNext();
}
cursor.close();
Inheritance and init method in Python
A simple change in Num2 class like this:
super().__init__(num)
It works in python3.
class Num:
def __init__(self,num):
self.n1 = num
class Num2(Num):
def __init__(self,num):
super().__init__(num)
self.n2 = num*2
def show(self):
print (self.n1,self.n2)
mynumber = Num2(8)
mynumber.show()
Process escape sequences in a string in Python
Below code should work for \n is required to be displayed on the string.
import string
our_str = 'The String is \\n, \\n and \\n!'
new_str = string.replace(our_str, '/\\n', '/\n', 1)
print(new_str)
Good ways to sort a queryset? - Django
What about
import operator
auths = Author.objects.order_by('-score')[:30]
ordered = sorted(auths, key=operator.attrgetter('last_name'))
In Django 1.4 and newer you can order by providing multiple fields.
Reference: https://docs.djangoproject.com/en/dev/ref/models/querysets/#order-by
order_by(*fields)
By default, results returned by a QuerySet are ordered by the ordering tuple given by the ordering option in the model’s Meta. You can override this on a per-QuerySet basis by using the order_by method.
Example:
ordered_authors = Author.objects.order_by('-score', 'last_name')[:30]
The result above will be ordered by score descending, then by last_name ascending. The negative sign in front of "-score" indicates descending order. Ascending order is implied.
Failed to load ApplicationContext from Unit Test: FileNotFound
Try with the relative path using *
@ContextConfiguration(locations = {
"classpath*:spring/applicationContext.xml",
"classpath*:spring/applicationContext-jpa.xml",
"classpath*:spring/applicationContext-security.xml" })
If not look if your xml are really on resources/spring/.
Finally try just on without location
@ContextConfiguration({"classpath*:spring/applicationContext.xml"})
The other error that you´re showing is because you have this tag duplicated on applicationContext.xml and applicationContext-security.xml
Duplicate <global-method-security>
Getters \ setters for dummies
In addition to @millimoose's answer, setters can also be used to update other values.
function Name(first, last) {
this.first = first;
this.last = last;
}
Name.prototype = {
get fullName() {
return this.first + " " + this.last;
},
set fullName(name) {
var names = name.split(" ");
this.first = names[0];
this.last = names[1];
}
};
Now, you can set fullName, and first and last will be updated and vice versa.
n = new Name('Claude', 'Monet')
n.first # "Claude"
n.last # "Monet"
n.fullName # "Claude Monet"
n.fullName = "Gustav Klimt"
n.first # "Gustav"
n.last # "Klimt"
How to log Apache CXF Soap Request and Soap Response using Log4j?
This worked for me.
Setup log4j as normal. Then use this code:
// LOGGING
LoggingOutInterceptor loi = new LoggingOutInterceptor();
loi.setPrettyLogging(true);
LoggingInInterceptor lii = new LoggingInInterceptor();
lii.setPrettyLogging(true);
org.apache.cxf.endpoint.Client client = org.apache.cxf.frontend.ClientProxy.getClient(isalesService);
org.apache.cxf.endpoint.Endpoint cxfEndpoint = client.getEndpoint();
cxfEndpoint.getOutInterceptors().add(loi);
cxfEndpoint.getInInterceptors().add(lii);
How to validate an email address using a regular expression?
This question is asked a lot, but I think you should step back and ask yourself why you want to validate email adresses syntactically? What is the benefit really?
- It will not catch common typos.
- It does not prevent people from entering invalid or made-up email addresses, or entering someone else's address.
If you want to validate that an email is correct, you have no choice than to send an confirmation email and have the user reply to that. In many cases you will have to send a confirmation mail anyway for security reasons or for ethical reasons (so you cannot e.g. sign someone up to a service against their will).
List of IP addresses/hostnames from local network in Python
For OSX (and Linux), a simple solution is to use either os.popen or os.system and run the arp -a command.
For example:
devices = []
for device in os.popen('arp -a'): devices.append(device)
This will give you a list of the devices on your local network.
Get month name from number
I created my own function converting numbers to their corresponding month.
def month_name (number):
if number == 1:
return "January"
elif number == 2:
return "February"
elif number == 3:
return "March"
elif number == 4:
return "April"
elif number == 5:
return "May"
elif number == 6:
return "June"
elif number == 7:
return "July"
elif number == 8:
return "August"
elif number == 9:
return "September"
elif number == 10:
return "October"
elif number == 11:
return "November"
elif number == 12:
return "December"
Then I can call the function. For example:
print (month_name (12))
Outputs:
>>> December
Retrieve data from a ReadableStream object?
Some people may find an async example useful:
var response = await fetch("https://httpbin.org/ip");
var body = await response.json(); // .json() is asynchronous and therefore must be awaited
json() converts the response's body from a ReadableStream to a json object.
The await statements must be wrapped in an async function, however you can run await statements directly in the console of Chrome (as of version 62).
Using Pairs or 2-tuples in Java
Another 2 cents : Starting with Java 7, there is now a class for this in standard Lib : javafx.util.Pair.
And Yes, It is standard Java, now that JavaFx is included in the JDK :)
GitHub - failed to connect to github 443 windows/ Failed to connect to gitHub - No Error
On Windows 7 setting the proxy to global config will resolve this issue
git config --global http.proxy http://user:password@proxy_addr:port
but the problem here is your password will not be encrypted.. Hopefully that should not be much problem as most of time you will be sole owner of your PC.
sys.argv[1], IndexError: list index out of range
I've done some research and it seems that the sys.argv might require an argument at the command line when running the script
Not might, but definitely requires. That's the whole point of sys.argv, it contains the command line arguments. Like any python array, accesing non-existent element raises IndexError.
Although the code uses try/except to trap some errors, the offending statement occurs in the first line.
So the script needs a directory name, and you can test if there is one by looking at len(sys.argv) and comparing to 1+number_of_requirements. The argv always contains the script name plus any user supplied parameters, usually space delimited but the user can override the space-split through quoting. If the user does not supply the argument, your choices are supplying a default, prompting the user, or printing an exit error message.
To print an error and exit when the argument is missing, add this line before the first use of sys.argv:
if len(sys.argv)<2:
print "Fatal: You forgot to include the directory name on the command line."
print "Usage: python %s <directoryname>" % sys.argv[0]
sys.exit(1)
sys.argv[0] always contains the script name, and user inputs are placed in subsequent slots 1, 2, ...
see also:
How to create a new database after initally installing oracle database 11g Express Edition?
This link: Creating the Sample Database in Oracle 11g Release 2 is a good example of creating a sample database.
This link: Newbie Guide to Oracle 11g Database Common Problems should help you if you come across some common problems creating your database.
Best of luck!
EDIT: As you are using XE, you should have a DB already created, to connect using SQL*Plus and SQL Developer etc. the info is here: Connecting to Oracle Database Express Edition and Exploring It.
Extract:
Connecting to Oracle Database XE from SQL Developer SQL Developer is a client program with which you can access Oracle Database XE. With Oracle Database XE 11g Release 2 (11.2), you must use SQL Developer version 3.0. This section assumes that SQL Developer is installed on your system, and shows how to start it and connect to Oracle Database XE. If SQL Developer is not installed on your system, see Oracle Database SQL Developer User's Guide for installation instructions.
Note:
For the following procedure: The first time you start SQL Developer on your system, you must provide the full path to java.exe in step 1.
For step 4, you need a user name and password.
For step 6, you need a host name and port.
To connect to Oracle Database XE from SQL Developer:
Start SQL Developer.
For instructions, see Oracle Database SQL Developer User's Guide.
If this is the first time you have started SQL Developer on your system, you are prompted to enter the full path to java.exe (for example, C:\jdk1.5.0\bin\java.exe). Either type the full path after the prompt or browse to it, and then press the key Enter.
The Oracle SQL Developer window opens.
In the navigation frame of the window, click Connections.
The Connections pane appears.
In the Connections pane, click the icon New Connection.
The New/Select Database Connection window opens.
In the New/Select Database Connection window, type the appropriate values in the fields Connection Name, Username, and Password.
For security, the password characters that you type appear as asterisks.
Near the Password field is the check box Save Password. By default, it is deselected. Oracle recommends accepting the default.
In the New/Select Database Connection window, click the tab Oracle.
The Oracle pane appears.
In the Oracle pane:
For Connection Type, accept the default (Basic).
For Role, accept the default.
In the fields Hostname and Port, either accept the defaults or type the appropriate values.
Select the option SID.
In the SID field, type accept the default (xe).
In the New/Select Database Connection window, click the button Test.
The connection is tested. If the connection succeeds, the Status indicator changes from blank to Success.
Description of the illustration success.gif
If the test succeeded, click the button Connect.
The New/Select Database Connection window closes. The Connections pane shows the connection whose name you entered in the Connection Name field in step 4.
You are in the SQL Developer environment.
To exit SQL Developer, select Exit from the File menu.
What does "use strict" do in JavaScript, and what is the reasoning behind it?
"use strict" makes JavaScript code to run in strict mode, which basically means everything needs to be defined before use. The main reason for using strict mode is to avoid accidental global uses of undefined methods.
Also in strict mode, things run faster, some warnings or silent warnings throw fatal errors, it's better to always use it to make a neater code.
"use strict" is widely needed to be used in ECMA5, in ECMA6 it's part of JavaScript by default, so it doesn't need to be added if you're using ES6.
Look at these statements and examples from MDN:
The "use strict" Directive
The "use strict" directive is new in JavaScript 1.8.5 (ECMAScript version 5). It is not a statement, but a literal expression, ignored by earlier versions of JavaScript. The purpose of "use strict" is to indicate that the code should be executed in "strict mode". With strict mode, you can not, for example, use undeclared variables.Examples of using "use strict":
Strict mode for functions: Likewise, to invoke strict mode for a function, put the exact statement "use strict"; (or 'use strict';) in the function's body before any other statements.
1) strict mode in functions
function strict() {
// Function-level strict mode syntax
'use strict';
function nested() { return 'And so am I!'; }
return "Hi! I'm a strict mode function! " + nested();
}
function notStrict() { return "I'm not strict."; }
console.log(strict(), notStrict());
2) whole-script strict mode
'use strict';
var v = "Hi! I'm a strict mode script!";
console.log(v);
3) Assignment to a non-writable global
'use strict';
// Assignment to a non-writable global
var undefined = 5; // throws a TypeError
var Infinity = 5; // throws a TypeError
// Assignment to a non-writable property
var obj1 = {};
Object.defineProperty(obj1, 'x', { value: 42, writable: false });
obj1.x = 9; // throws a TypeError
// Assignment to a getter-only property
var obj2 = { get x() { return 17; } };
obj2.x = 5; // throws a TypeError
// Assignment to a new property on a non-extensible object.
var fixed = {};
Object.preventExtensions(fixed);
fixed.newProp = 'ohai'; // throws a TypeError
You can read more on MDN.
How To Set Text In An EditText
You can set android:text="your text";
<EditText
android:id="@+id/editTextName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/intro_name"/>
Using jquery to delete all elements with a given id
id of dom element shout be unique. Use class instead (<span class='myclass'>).
To remove all span with this class:
$('.myclass').remove()
Downloading jQuery UI CSS from Google's CDN
You could use this one if you mean the jQuery UI css:
<link rel="stylesheet" type="text/css" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />
what is the difference between GROUP BY and ORDER BY in sql
It should be noted GROUP BY is not always necessary as (at least in PostgreSQL, and likely in other SQL variants) you can use ORDER BY with a list and you can still use ASC or DESC per column...
SELECT name_first, name_last, dob
FROM those_guys
ORDER BY name_last ASC, name_first ASC, dob DESC;
How to make a great R reproducible example
If you have large dataset which cannot be easily put to the script using dput(),
post your data to pastebin and load them using read.table:
d <- read.table("http://pastebin.com/raw.php?i=m1ZJuKLH")
Inspired by @Henrik.
Changing ImageView source
Just write a method for changing imageview
public void setImage(final Context mContext, final ImageView imageView, int picture)
{
if (mContext != null && imageView != null)
{
try
{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
{
imageView.setImageDrawable(mContext.getResources().getDrawable(picture, mContext.getApplicationContext().getTheme()));
} else
{
imageView.setImageDrawable(mContext.getResources().getDrawable(picture));
}
} catch (Exception e)
{
e.printStackTrace();
}
}
}
HikariCP - connection is not available
I managed to fix it finally. The problem is not related to HikariCP.
The problem persisted because of some complex methods in REST controllers executing multiple changes in DB through JPA repositories. For some reasons calls to these interfaces resulted in a growing number of "freezed" active connections, exhausting the pool. Either annotating these methods as @Transactional or enveloping all the logic in a single call to transactional service method seem to solve the problem.
jQuery - Increase the value of a counter when a button is clicked
I'm going to try this the following way. I've placed the count variable inside the "onfocus" function so as to keep it from becoming a global variable. The idea is to create a counter for each image in a tumblr blog.
$(document).ready(function() {
$("#image1").onfocus(function() {
var count;
if (count == undefined || count == "" || count == 0) {
var count = 0;
}
count++;
$("#counter1").html("Image Views: " + count);
}
});
Then, outside the script tags and in the desired place in the body I'll add:
<div id="counter1"></div>
Fastest way to set all values of an array?
As another option and for posterity I was looking into this recently and found a solution that allows a much shorter loop by handing some of the work off to the System class, which (if the JVM you're using is smart enough) can be turned into a memset operation:-
/*
* initialize a smaller piece of the array and use the System.arraycopy
* call to fill in the rest of the array in an expanding binary fashion
*/
public static void bytefill(byte[] array, byte value) {
int len = array.length;
if (len > 0){
array[0] = value;
}
//Value of i will be [1, 2, 4, 8, 16, 32, ..., len]
for (int i = 1; i < len; i += i) {
System.arraycopy(array, 0, array, i, ((len - i) < i) ? (len - i) : i);
}
}
This solution was taken from the IBM research paper "Java server performance: A case study of building efficient, scalable Jvms" by R. Dimpsey, R. Arora, K. Kuiper.
Simplified explanation
As the comment suggests, this sets index 0 of the destination array to your value then uses the System class to copy one object i.e. the object at index 0 to index 1 then those two objects (index 0 and 1) into 2 and 3, then those four objects (0,1,2 and 3) into 4,5,6 and 7 and so on...
Efficiency (at the point of writing)
In a quick run through, grabbing the System.nanoTime() before and after and calculating a duration I came up with:-
- This method : 332,617 - 390,262 ('highest - lowest' from 10 tests)
Float[] n = new Float[array.length]; //Fill with null: 666,650- Setting via loop : 3,743,488 - 9,767,744 ('highest - lowest' from 10 tests)
Arrays.fill: 12,539,336
The JVM and JIT compilation
It should be noted that as the JVM and JIT evolves, this approach may well become obsolete as library and runtime optimisations could reach or even exceed these numbers simply using fill().
At the time of writing, this was the fastest option I had found. It has been mentioned this might not be the case now but I have not checked. This is the beauty and the curse of Java.
Read input from console in Ruby?
There are many ways to take input from the users. I personally like using the method gets. When you use gets, it gets the string that you typed, and that includes the ENTER key that you pressed to end your input.
name = gets
"mukesh\n"
You can see this in irb; type this and you will see the \n, which is the “newline” character that the ENTER key produces: Type
name = getsyou will see somethings like"mukesh\n"You can get rid of pesky newline character using chomp method.
The chomp method gives you back the string, but without the terminating newline. Beautiful chomp method life saviour.
name = gets.chomp
"mukesh"
You can also use terminal to read the input. ARGV is a constant defined in the Object class. It is an instance of the Array class and has access to all the array methods. Since it’s an array, even though it’s a constant, its elements can be modified and cleared with no trouble. By default, Ruby captures all the command line arguments passed to a Ruby program (split by spaces) when the command-line binary is invoked and stores them as strings in the ARGV array.
When written inside your Ruby program, ARGV will take take a command line command that looks like this:
test.rb hi my name is mukesh
and create an array that looks like this:
["hi", "my", "name", "is", "mukesh"]
But, if I want to passed limited input then we can use something like this.
test.rb 12 23
and use those input like this in your program:
a = ARGV[0]
b = ARGV[1]
Check if space is in a string
word = ' '
while True:
if ' ' in word:
word = raw_input("Please enter a single word: ")
else:
print "Thanks"
break
This is more idiomatic python - comparison against True or False is not necessary - just use the value returned by the expression ' ' in word.
Also, you don't need to use pastebin for such a small snippet of code - just copy the code into your post and use the little 1s and 0s button to make your code look like code.
How to disable right-click context-menu in JavaScript
If your page really relies on the fact that people won't be able to see that menu, you should know that modern browsers (for example Firefox) let the user decide if he really wants to disable it or not. So you have no guarantee at all that the menu would be really disabled.
Parameter binding on left joins with array in Laravel Query Builder
You don't have to bind parameters if you use query builder or eloquent ORM. However, if you use DB::raw(), ensure that you binding the parameters.
Try the following:
$array = array(1,2,3); $query = DB::table('offers'); $query->select('id', 'business_id', 'address_id', 'title', 'details', 'value', 'total_available', 'start_date', 'end_date', 'terms', 'type', 'coupon_code', 'is_barcode_available', 'is_exclusive', 'userinformations_id', 'is_used'); $query->leftJoin('user_offer_collection', function ($join) use ($array) { $join->on('user_offer_collection.offers_id', '=', 'offers.id') ->whereIn('user_offer_collection.user_id', $array); }); $query->get(); Can I set up HTML/Email Templates with ASP.NET?
Here is one more alternative that uses XSL transformations for more complex email templates: Sending HTML-based email from .NET applications.
Concatenate two slices in Go
I think it's important to point out and to know that if the destination slice (the slice you append to) has sufficient capacity, the append will happen "in-place", by reslicing the destination (reslicing to increase its length in order to be able to accommodate the appendable elements).
This means that if the destination was created by slicing a bigger array or slice which has additional elements beyond the length of the resulting slice, they may get overwritten.
To demonstrate, see this example:
a := [10]int{1, 2}
fmt.Printf("a: %v\n", a)
x, y := a[:2], []int{3, 4}
fmt.Printf("x: %v, y: %v\n", x, y)
fmt.Printf("cap(x): %v\n", cap(x))
x = append(x, y...)
fmt.Printf("x: %v\n", x)
fmt.Printf("a: %v\n", a)
Output (try it on the Go Playground):
a: [1 2 0 0 0 0 0 0 0 0]
x: [1 2], y: [3 4]
cap(x): 10
x: [1 2 3 4]
a: [1 2 3 4 0 0 0 0 0 0]
We created a "backing" array a with length 10. Then we create the x destination slice by slicing this a array, y slice is created using the composite literal []int{3, 4}. Now when we append y to x, the result is the expected [1 2 3 4], but what may be surprising is that the backing array a also changed, because capacity of x is 10 which is sufficient to append y to it, so x is resliced which will also use the same a backing array, and append() will copy elements of y into there.
If you want to avoid this, you may use a full slice expression which has the form
a[low : high : max]
which constructs a slice and also controls the resulting slice's capacity by setting it to max - low.
See the modified example (the only difference is that we create x like this: x = a[:2:2]:
a := [10]int{1, 2}
fmt.Printf("a: %v\n", a)
x, y := a[:2:2], []int{3, 4}
fmt.Printf("x: %v, y: %v\n", x, y)
fmt.Printf("cap(x): %v\n", cap(x))
x = append(x, y...)
fmt.Printf("x: %v\n", x)
fmt.Printf("a: %v\n", a)
Output (try it on the Go Playground)
a: [1 2 0 0 0 0 0 0 0 0]
x: [1 2], y: [3 4]
cap(x): 2
x: [1 2 3 4]
a: [1 2 0 0 0 0 0 0 0 0]
As you can see, we get the same x result but the backing array a did not change, because capacity of x was "only" 2 (thanks to the full slice expression a[:2:2]). So to do the append, a new backing array is allocated that can store the elements of both x and y, which is distinct from a.
Importing CommonCrypto in a Swift framework
@mogstad has been kind enough to wrap @stephencelis solution in a Cocoapod:
pod 'libCommonCrypto'
The other pods available did not work for me.
Responsive web design is working on desktop but not on mobile device
I have also faced this problem. Finally I got a solution. Use this bellow code. Hope: problem will be solve.
<meta name="viewport" content="initial-scale=1, maximum-scale=1">
How to add anything in <head> through jquery/javascript?
JavaScript:
document.getElementsByTagName('head')[0].appendChild( ... );
Make DOM element like so:
link=document.createElement('link');
link.href='href';
link.rel='rel';
document.getElementsByTagName('head')[0].appendChild(link);
Rebuild or regenerate 'ic_launcher.png' from images in Android Studio
In Android studio 0.8 and after
Right click on app folder then New > Image Asset
Browse for best resolution image you have in "Image file" field
hit Next The rest will be generated
How to make PyCharm always show line numbers
PyCharm Version 3.4.1(For all files in the project):
File -> Preferences -> Editor (IDE Settings) -> Appearance -> mark 'Show line numbers'
PyCharm Version 3.4.1(only for existing file in the project):
View -> Active Editor -> Show Line Numbers
How to recover Git objects damaged by hard disk failure?
Banengusk was putting me on the right track. For further reference, I want to post the steps I took to fix my repository corruption. I was lucky enough to find all needed objects either in older packs or in repository backups.
# Unpack last non-corrupted pack
$ mv .git/objects/pack .git/objects/pack.old
$ git unpack-objects -r < .git/objects/pack.old/pack-012066c998b2d171913aeb5bf0719fd4655fa7d0.pack
$ git log
fatal: bad object HEAD
$ cat .git/HEAD
ref: refs/heads/master
$ ls .git/refs/heads/
$ cat .git/packed-refs
# pack-refs with: peeled
aa268a069add6d71e162c4e2455c1b690079c8c1 refs/heads/master
$ git fsck --full
error: HEAD: invalid sha1 pointer aa268a069add6d71e162c4e2455c1b690079c8c1
error: refs/heads/master does not point to a valid object!
missing blob 75405ef0e6f66e48c1ff836786ff110efa33a919
missing blob 27c4611ffbc3c32712a395910a96052a3de67c9b
dangling tree 30473f109d87f4bcde612a2b9a204c3e322cb0dc
# Copy HEAD object from backup of repository
$ cp repobackup/.git/objects/aa/268a069add6d71e162c4e2455c1b690079c8c1 .git/objects/aa
# Now copy all missing objects from backup of repository and run "git fsck --full" afterwards
# Repeat until git fsck --full only reports dangling objects
# Now garbage collect repo
$ git gc
warning: reflog of 'HEAD' references pruned commits
warning: reflog of 'refs/heads/master' references pruned commits
Counting objects: 3992, done.
Delta compression using 2 threads.
fatal: object bf1c4953c0ea4a045bf0975a916b53d247e7ca94 inconsistent object length (6093 vs 415232)
error: failed to run repack
# Check reflogs...
$ git reflog
# ...then clean
$ git reflog expire --expire=0 --all
# Now garbage collect again
$ git gc
Counting objects: 3992, done.
Delta compression using 2 threads.
Compressing objects: 100% (3970/3970), done.
Writing objects: 100% (3992/3992), done.
Total 3992 (delta 2060), reused 0 (delta 0)
Removing duplicate objects: 100% (256/256), done.
# Done!
How to input a path with a white space?
You can escape the "space" char by putting a \ right before it.
iPhone - Get Position of UIView within entire UIWindow
For me this code worked best:
private func getCoordinate(_ view: UIView) -> CGPoint {
var x = view.frame.origin.x
var y = view.frame.origin.y
var oldView = view
while let superView = oldView.superview {
x += superView.frame.origin.x
y += superView.frame.origin.y
if superView.next is UIViewController {
break //superView is the rootView of a UIViewController
}
oldView = superView
}
return CGPoint(x: x, y: y)
}
Create an Array of Arraylists
You can create Array of ArrayList
List<Integer>[] outer = new List[number];
for (int i = 0; i < number; i++) {
outer[i] = new ArrayList<>();
}
This will be helpful in scenarios like this. You know the size of the outer one. But the size of inner ones varies. Here you can create an array of fixed length which contains size-varying Array lists. Hope this will be helpful for you.
In Java 8 and above you can do it in a much better way.
List<Integer>[] outer = new List[number];
Arrays.setAll(outer, element -> new ArrayList<>());
Even better using method reference
List<Integer>[] outer = new List[10];
Arrays.setAll(outer, ArrayList :: new);
Cannot issue data manipulation statements with executeQuery()
@Modifying
@Transactional
@Query(value = "delete from cart_item where cart_cart_id=:cart", nativeQuery = true)
public void deleteByCart(@Param("cart") int cart);
Do not forget to add @Modifying and @Transnational before @query. it works for me.
To delete the record with some condition using native query with JPA the above mentioned annotations are important.
PHP returning JSON to JQUERY AJAX CALL
You can return json in PHP this way:
header('Content-Type: application/json');
echo json_encode(array('foo' => 'bar'));
exit;
org.springframework.beans.factory.BeanCreationException: Error creating bean with name
you need to add jar file in your build path..
commons-dbcp-1.1-RC2.jar
or any version of that..!!!!
ADDED : also make sure you have commons-pool-1.1.jar too in your build path.
ADDED: sorry saw complete list of jar late... may be version clashes might be there.. better check out..!!! just an assumption.
What exactly does a jar file contain?
However, I got curious to what each class contained and when I try to open one of the classes in the jar file, it tells me that I need a source file.
A jar file is basically a zip file containing .class files and potentially other resources (and metadata about the jar itself). It's hard to compare C to Java really, as Java byte code maintains a lot more metadata than most binary formats - but the class file is compiled code instead of source code.
If you either open the jar file with a zip utility or run jar xf foo.jar you can extract the files from it, and have a look at them. Note that you don't need a jar file to run Java code - classloaders can load class data directly from the file system, or from URLs, as well as from jar files.
Java Reflection Performance
Yes - absolutely. Looking up a class via reflection is, by magnitude, more expensive.
Quoting Java's documentation on reflection:
Because reflection involves types that are dynamically resolved, certain Java virtual machine optimizations can not be performed. Consequently, reflective operations have slower performance than their non-reflective counterparts, and should be avoided in sections of code which are called frequently in performance-sensitive applications.
Here's a simple test I hacked up in 5 minutes on my machine, running Sun JRE 6u10:
public class Main {
public static void main(String[] args) throws Exception
{
doRegular();
doReflection();
}
public static void doRegular() throws Exception
{
long start = System.currentTimeMillis();
for (int i=0; i<1000000; i++)
{
A a = new A();
a.doSomeThing();
}
System.out.println(System.currentTimeMillis() - start);
}
public static void doReflection() throws Exception
{
long start = System.currentTimeMillis();
for (int i=0; i<1000000; i++)
{
A a = (A) Class.forName("misc.A").newInstance();
a.doSomeThing();
}
System.out.println(System.currentTimeMillis() - start);
}
}
With these results:
35 // no reflection
465 // using reflection
Bear in mind the lookup and the instantiation are done together, and in some cases the lookup can be refactored away, but this is just a basic example.
Even if you just instantiate, you still get a performance hit:
30 // no reflection
47 // reflection using one lookup, only instantiating
Again, YMMV.
Regular expression for a string that does not start with a sequence
You could use a negative look-ahead assertion:
^(?!tbd_).+
Or a negative look-behind assertion:
(^.{1,3}$|^.{4}(?<!tbd_).*)
Or just plain old character sets and alternations:
^([^t]|t($|[^b]|b($|[^d]|d($|[^_])))).*
jQuery $.cookie is not a function
You should add first jquery.cookie.js then add your js or jQuery where you are using that function.
When browser loads the webpage first it loads this jquery.cookie.js and after then you js or jQuery and now that function is available for use
Convert multidimensional array into single array
Save this as a php file, simply import and use single_array() function
<?php
$GLOBALS['single_array']=[];
function array_conveter($array_list){
if(is_array($array_list)){
foreach($array_list as $array_ele){
if(is_array($array_ele)){
array_conveter($array_ele);
}else{
array_push($GLOBALS['single_array'],$array_ele);
}
}
}else{
array_push($GLOBALS['single_array'],$array_list);
}
}
function single_array($mix){
foreach($mix as $single){
array_conveter($single);
}return $GLOBALS['single_array'];
$GLOBALS['single_array']=[];
}
/* Example convert your multi array to single */
$mix_array=[3,4,5,[4,6,6,7],'abc'];
print_r(single_array($mix_array));
?>
How do I turn a String into a InputStreamReader in java?
ByteArrayInputStream also does the trick:
InputStream is = new ByteArrayInputStream( myString.getBytes( charset ) );
Then convert to reader:
InputStreamReader reader = new InputStreamReader(is);
NPM Install Error:Unexpected end of JSON input while parsing near '...nt-webpack-plugin":"0'
Try setting
npm config set strict-ssl false
and then try running,
npm install -g @angular/cli
How to break out from a ruby block?
next and break seem to do the correct thing in this simplified example!
class Bar
def self.do_things
Foo.some_method(1..10) do |x|
next if x == 2
break if x == 9
print "#{x} "
end
end
end
class Foo
def self.some_method(targets, &block)
targets.each do |target|
begin
r = yield(target)
rescue => x
puts "rescue #{x}"
end
end
end
end
Bar.do_things
output: 1 3 4 5 6 7 8
How to examine processes in OS X's Terminal?
if you are using ps, you can check the manual
man ps
there is a list of keywords allowing you to build what you need. for example to show, userid / processid / percent cpu / percent memory / work queue / command :
ps -e -o "uid pid pcpu pmem wq comm"
-e is similar to -A (all inclusive; your processes and others), and -o is to force a format.
if you are looking for a specific uid, you can chain it using awk or grep such as :
ps -e -o "uid pid pcpu pmem wq comm" | grep 501
this should (almost) show only for userid 501. try it.
Dynamic Web Module 3.0 -- 3.1
If you want to use version 3.1 you need to use the following schema:
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd
Note that 3.0 and 3.1 are different: in 3.1 there's no Sun mentioned, so simply changing 3_0.xsd to 3_1.xsd won't work.
This is how it should look like:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:web="http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee">
</web-app>
Also, make sure you're depending on the latest versions in your pom.xml. That is,
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
...
</configuration>
</plugin>
and
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
Finally, you should compile with Java 7 or 8:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
Error "File google-services.json is missing from module root folder. The Google Services Plugin cannot function without it"
Go to Tools-->Firebase in your Android Studio and click on Connect your app to Firebase. They will set it up for you.
Undefined symbols for architecture armv7
I give you more suggestions that you can check when other common suggestions are not help.
If you link with other project(libxxx.a) you might sometimes meet strange problem which you can find the symbol with tools like nm but they just can not find the symbols in ld. Then you should check if the two projects are built in the same flags, some of them may affect the binary format.
- check c++ compiler.
- check c++ dialect setting.
- check c++ runtime type support. (-frtti/-fnortti)
- check if there is .a with the same name appears elsewhere, could be beyond the wanted file in the link path list. remove them.
How do I temporarily disable triggers in PostgreSQL?
SET session_replication_role = replica;
also dosent work for me in Postgres 9.1. i use the two function described by bartolo-otrit with some modification. I modified the first function to make it work for me because the namespace or the schema must be present to identify the table correctly. The new code is :
CREATE OR REPLACE FUNCTION disable_triggers(a boolean, nsp character varying)
RETURNS void AS
$BODY$
declare
act character varying;
r record;
begin
if(a is true) then
act = 'disable';
else
act = 'enable';
end if;
for r in select c.relname from pg_namespace n
join pg_class c on c.relnamespace = n.oid and c.relhastriggers = true
where n.nspname = nsp
loop
execute format('alter table %I.%I %s trigger all', nsp,r.relname, act);
end loop;
end;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION disable_triggers(boolean, character varying)
OWNER TO postgres;
then i simply do a select query for every schema :
SELECT disable_triggers(true,'public');
SELECT disable_triggers(true,'Adempiere');
What is compiler, linker, loader?
Compiler It converts the source code into the object code.
Linker It combines the multiple object files into a single executable program file.
Loader It loads the executable file into main memory.
Python's "in" set operator
Sets behave different than dicts, you need to use set operations like issubset():
>>> k
{'ip': '123.123.123.123', 'pw': 'test1234', 'port': 1234, 'debug': True}
>>> set('ip,port,pw'.split(',')).issubset(set(k.keys()))
True
>>> set('ip,port,pw'.split(',')) in set(k.keys())
False
Android: checkbox listener
Translation of the accepted answer by Chris into Kotlin:
val checkBox: CheckBox = findViewById(R.id.chk)
checkBox.setOnCheckedChangeListener { buttonView, isChecked ->
// Code here
}
How to use custom font in a project written in Android Studio
There are many ways to set custom font family on field and I am using like that below.
To add fonts as resources, perform the following steps in the Android Studio:
1) Right-click the res folder and go to New > Android resource directory. The New Resource Directory window appears.
2) In the Resource type list, select font, and then click OK.
Note: The name of the resource directory must be font.
3) Add your font files in the font folder.
Add font in desired view in your xml file:
Note: But you required the following things for that:
Android Studio above to 3.0 canary.
Your Activity extends AppCompatActivity.
Update your Gradle file like that:
compileSdkVersion 26
buildToolsVersion "26.0.1"
defaultConfig {
minSdkVersion 19
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildtoolsVersion above to 26 and minimum targetSdkVersion required 26
- Add dependencies in build.gradle file:
classpath 'com.android.tools.build:gradle:3.0.0-beta4'
- gradle-wrapper.properties:
distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
How do you change the launcher logo of an app in Android Studio?
Go to:
res > drawable > right click > show in folder > add desired logo
Then go to android manifest, edit ICON tag under application tag, use "@drawable/nameOfImage"
Calling other function in the same controller?
Yes. Problem is in wrong notation. Use:
$this->sendRequest($uri)
Instead. Or
self::staticMethod()
for static methods. Also read this for getting idea of OOP - http://www.php.net/manual/en/language.oop5.basic.php
How do I close a tkinter window?
you only need to type this:
root.destroy()
and you don't even need the quit() function cause when you set that as commmand it will quit the entire program.
IF-THEN-ELSE statements in postgresql
case when field1>0 then field2/field1 else 0 end as field3
ImageButton in Android
Did you try to give the layout_width and layout_height like the following? Since you are setting with wrap_content, the image button expands to the size of source image's height and width.
<blink>
<ImageButton>
android:id="@+id/Button01"
android:scaleType="fitXY"
android:layout_width="80dip"
android:layout_height="80dip"
android:cropToPadding="false"
android:paddingLeft="10dp"
android:src="@drawable/eye">
</ImageButton>
</blink>
Get epoch for a specific date using Javascript
Date.parse() method parses a string representation of a date, and returns the number of milliseconds since January 1, 1970, 00:00:00 UTC.
const unixTimeZero = Date.parse('01 Jan 1970 00:00:00 GMT');
const javaScriptRelease = Date.parse('04 Dec 1995 00:12:00 GMT');
console.log(unixTimeZero);
// expected output: 0
console.log(javaScriptRelease);
// expected output: 818035920000
Explore more at: Date.parse()
How to read pickle file?
There is a read_pickle function as part of pandas 0.22+
import pandas as pd
object = pd.read_pickle(r'filepath')
How to set top position using jquery
You can use CSS to do the trick:
$("#yourElement").css({ top: '100px' });
How can I add an item to a IEnumerable<T> collection?
A couple short, sweet extension methods on IEnumerable and IEnumerable<T> do it for me:
public static IEnumerable Append(this IEnumerable first, params object[] second)
{
return first.OfType<object>().Concat(second);
}
public static IEnumerable<T> Append<T>(this IEnumerable<T> first, params T[] second)
{
return first.Concat(second);
}
public static IEnumerable Prepend(this IEnumerable first, params object[] second)
{
return second.Concat(first.OfType<object>());
}
public static IEnumerable<T> Prepend<T>(this IEnumerable<T> first, params T[] second)
{
return second.Concat(first);
}
Elegant (well, except for the non-generic versions). Too bad these methods are not in the BCL.
Detect Windows version in .net
Don't over complicate the problem.
string osVer = System.Environment.OSVersion.Version.ToString();
if (osVer.StartsWith("5")) // windows 2000, xp win2k3
{
MessageBox.Show("xp!");
}
else // windows vista and windows 7 start with 6 in the version #
{
MessageBox.Show("Win7!");
}
Get current date, given a timezone in PHP?
I have created some simple function you can use to convert time to any timezone :
function convertTimeToLocal($datetime,$timezone='Europe/Dublin') {
$given = new DateTime($datetime, new DateTimeZone("UTC"));
$given->setTimezone(new DateTimeZone($timezone));
$output = $given->format("Y-m-d"); //can change as per your requirement
return $output;
}
stop service in android
To stop the service we must use the method stopService():
Intent myService = new Intent(MainActivity.this, BackgroundSoundService.class);
//startService(myService);
stopService(myService);
then the method onDestroy() in the service is called:
@Override
public void onDestroy() {
Log.i(TAG, "onCreate() , service stopped...");
}
Here is a complete example including how to stop the service.
How to show hidden divs on mouseover?
Option 1 Each div is specifically identified, so any other div (without the specific IDs) on the page will not obey the :hover pseudo-class.
<style type="text/css">
#div1, #div2, #div3{
display:none;
}
#div1:hover, #div2:hover, #div3:hover{
display:block;
}
</style>
Option 2 All divs on the page, regardless of IDs, have the hover effect.
<style type="text/css">
div{
display:none;
}
div:hover{
display:block;
}
</style>
The simplest way to resize an UIImage?
If you just want an image smaller and don't care about exact size:
+ (UIImage *)imageWithImage:(UIImage *)image scaledToScale:(CGFloat)scale
{
UIGraphicsBeginImageContextWithOptions(self.size, YES, scale);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
[self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Setting scale to 0.25f will give you a 816 by 612 image from a 8MP camera.
Here's a category UIImage+Scale for those who needs one.
How to update npm
For me It worked with following commands
- $curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
- $apt install nodejs
Python function global variables?
You can directly access a global variable inside a function. If you want to change the value of that global variable, use "global variable_name". See the following example:
var = 1
def global_var_change():
global var
var = "value changed"
global_var_change() #call the function for changes
print var
Generally speaking, this is not a good programming practice. By breaking namespace logic, code can become difficult to understand and debug.
How to request a random row in SQL?
You didn't say which server you're using. In older versions of SQL Server, you can use this:
select top 1 * from mytable order by newid()
In SQL Server 2005 and up, you can use TABLESAMPLE to get a random sample that's repeatable:
SELECT FirstName, LastName
FROM Contact
TABLESAMPLE (1 ROWS) ;
return value after a promise
The best way to do this would be to use the promise returning function as it is, like this
lookupValue(file).then(function(res) {
// Write the code which depends on the `res.val`, here
});
The function which invokes an asynchronous function cannot wait till the async function returns a value. Because, it just invokes the async function and executes the rest of the code in it. So, when an async function returns a value, it will not be received by the same function which invoked it.
So, the general idea is to write the code which depends on the return value of an async function, in the async function itself.
What's the difference between [ and [[ in Bash?
The most important difference will be the clarity of your code. Yes, yes, what's been said above is true, but [[ ]] brings your code in line with what you would expect in high level languages, especially in regards to AND (&&), OR (||), and NOT (!) operators. Thus, when you move between systems and languages you will be able to interpret script faster which makes your life easier. Get the nitty gritty from a good UNIX/Linux reference. You may find some of the nitty gritty to be useful in certain circumstances, but you will always appreciate clear code! Which script fragment would you rather read? Even out of context, the first choice is easier to read and understand.
if [[ -d $newDir && -n $(echo $newDir | grep "^${webRootParent}") && -n $(echo $newDir | grep '/$') ]]; then ...
or
if [ -d "$newDir" -a -n "$(echo "$newDir" | grep "^${webRootParent}")" -a -n "$(echo "$newDir" | grep '/$')" ]; then ...
Warning comparison between pointer and integer
It should be
if (*message == '\0')
In C, simple quotes delimit a single character whereas double quotes are for strings.
Array.push() if does not exist?
My choice was to use .includes() extending the Array.prototype as @Darrin Dimitrov suggested:
Array.prototype.pushIfNotIncluded = function (element) {
if (!this.includes(element)) {
array.push(element);
}
}
Just remembering that includes comes from es6 and does not work on IE:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes
Group by with multiple columns using lambda
if your table is like this
rowId col1 col2 col3 col4
1 a e 12 2
2 b f 42 5
3 a e 32 2
4 b f 44 5
var grouped = myTable.AsEnumerable().GroupBy(r=> new {pp1 = r.Field<int>("col1"), pp2 = r.Field<int>("col2")});
Searching for Text within Oracle Stored Procedures
I allways use UPPER(text) like UPPER('%blah%')
How to set text size of textview dynamically for different screens
float currentSize = textEdit.getTextSize(); // default size
float newSize = currentSize * 2.0F; // new size is twice bigger than default one
textEdit.setTextSize(newSize);
A Simple AJAX with JSP example
I have used jQuery AJAX to make AJAX requests.
Check the following code:
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$('#call').click(function ()
{
$.ajax({
type: "post",
url: "testme", //this is my servlet
data: "input=" +$('#ip').val()+"&output="+$('#op').val(),
success: function(msg){
$('#output').append(msg);
}
});
});
});
</script>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
input:<input id="ip" type="text" name="" value="" /><br></br>
output:<input id="op" type="text" name="" value="" /><br></br>
<input type="button" value="Call Servlet" name="Call Servlet" id="call"/>
<div id="output"></div>
</body>
Persist javascript variables across pages?
For completeness, also look into the local storage capabilities & sessionStorage of HTML5. These are supported in the latest versions of all modern browsers, and are much easier to use and less fiddly than cookies.
http://www.w3.org/TR/2009/WD-webstorage-20091222/
https://www.w3.org/TR/webstorage/. (second edition)
Here are some sample code for setting and getting the values using sessionStorage and localStorage :
// HTML5 session Storage
sessionStorage.setItem("variableName","test");
sessionStorage.getItem("variableName");
//HTML5 local storage
localStorage.setItem("variableName","Text");
// Receiving the data:
localStorage.getItem("variableName");
Abort trap 6 error in C
Try this:
void drawInitialNim(int num1, int num2, int num3){
int board[3][50] = {0}; // This is a local variable. It is not possible to use it after returning from this function.
int i, j, k;
for(i=0; i<num1; i++)
board[0][i] = 'O';
for(i=0; i<num2; i++)
board[1][i] = 'O';
for(i=0; i<num3; i++)
board[2][i] = 'O';
for (j=0; j<3;j++) {
for (k=0; k<50; k++) {
if(board[j][k] != 0)
printf("%c", board[j][k]);
}
printf("\n");
}
}
How do I enable --enable-soap in php on linux?
Getting SOAP working usually does not require compiling PHP from source. I would recommend trying that only as a last option.
For good measure, check to see what your phpinfo says, if anything, about SOAP extensions:
$ php -i | grep -i soap
to ensure that it is the PHP extension that is missing.
Assuming you do not see anything about SOAP in the phpinfo, see what PHP SOAP packages might be available to you.
In Ubuntu/Debian you can search with:
$ apt-cache search php | grep -i soap
or in RHEL/Fedora you can search with:
$ yum search php | grep -i soap
There are usually two PHP SOAP packages available to you, usually php-soap and php-nusoap. php-soap is typically what you get with configuring PHP with --enable-soap.
In Ubuntu/Debian you can install with:
$ sudo apt-get install php-soap
Or in RHEL/Fedora you can install with:
$ sudo yum install php-soap
After the installation, you might need to place an ini file and restart Apache.
Split (explode) pandas dataframe string entry to separate rows
UPDATE2: more generic vectorized function, which will work for multiple normal and multiple list columns
def explode(df, lst_cols, fill_value='', preserve_index=False):
# make sure `lst_cols` is list-alike
if (lst_cols is not None
and len(lst_cols) > 0
and not isinstance(lst_cols, (list, tuple, np.ndarray, pd.Series))):
lst_cols = [lst_cols]
# all columns except `lst_cols`
idx_cols = df.columns.difference(lst_cols)
# calculate lengths of lists
lens = df[lst_cols[0]].str.len()
# preserve original index values
idx = np.repeat(df.index.values, lens)
# create "exploded" DF
res = (pd.DataFrame({
col:np.repeat(df[col].values, lens)
for col in idx_cols},
index=idx)
.assign(**{col:np.concatenate(df.loc[lens>0, col].values)
for col in lst_cols}))
# append those rows that have empty lists
if (lens == 0).any():
# at least one list in cells is empty
res = (res.append(df.loc[lens==0, idx_cols], sort=False)
.fillna(fill_value))
# revert the original index order
res = res.sort_index()
# reset index if requested
if not preserve_index:
res = res.reset_index(drop=True)
return res
Demo:
Multiple list columns - all list columns must have the same # of elements in each row:
In [134]: df
Out[134]:
aaa myid num text
0 10 1 [1, 2, 3] [aa, bb, cc]
1 11 2 [] []
2 12 3 [1, 2] [cc, dd]
3 13 4 [] []
In [135]: explode(df, ['num','text'], fill_value='')
Out[135]:
aaa myid num text
0 10 1 1 aa
1 10 1 2 bb
2 10 1 3 cc
3 11 2
4 12 3 1 cc
5 12 3 2 dd
6 13 4
preserving original index values:
In [136]: explode(df, ['num','text'], fill_value='', preserve_index=True)
Out[136]:
aaa myid num text
0 10 1 1 aa
0 10 1 2 bb
0 10 1 3 cc
1 11 2
2 12 3 1 cc
2 12 3 2 dd
3 13 4
Setup:
df = pd.DataFrame({
'aaa': {0: 10, 1: 11, 2: 12, 3: 13},
'myid': {0: 1, 1: 2, 2: 3, 3: 4},
'num': {0: [1, 2, 3], 1: [], 2: [1, 2], 3: []},
'text': {0: ['aa', 'bb', 'cc'], 1: [], 2: ['cc', 'dd'], 3: []}
})
CSV column:
In [46]: df
Out[46]:
var1 var2 var3
0 a,b,c 1 XX
1 d,e,f,x,y 2 ZZ
In [47]: explode(df.assign(var1=df.var1.str.split(',')), 'var1')
Out[47]:
var1 var2 var3
0 a 1 XX
1 b 1 XX
2 c 1 XX
3 d 2 ZZ
4 e 2 ZZ
5 f 2 ZZ
6 x 2 ZZ
7 y 2 ZZ
using this little trick we can convert CSV-like column to list column:
In [48]: df.assign(var1=df.var1.str.split(','))
Out[48]:
var1 var2 var3
0 [a, b, c] 1 XX
1 [d, e, f, x, y] 2 ZZ
UPDATE: generic vectorized approach (will work also for multiple columns):
Original DF:
In [177]: df
Out[177]:
var1 var2 var3
0 a,b,c 1 XX
1 d,e,f,x,y 2 ZZ
Solution:
first let's convert CSV strings to lists:
In [178]: lst_col = 'var1'
In [179]: x = df.assign(**{lst_col:df[lst_col].str.split(',')})
In [180]: x
Out[180]:
var1 var2 var3
0 [a, b, c] 1 XX
1 [d, e, f, x, y] 2 ZZ
Now we can do this:
In [181]: pd.DataFrame({
...: col:np.repeat(x[col].values, x[lst_col].str.len())
...: for col in x.columns.difference([lst_col])
...: }).assign(**{lst_col:np.concatenate(x[lst_col].values)})[x.columns.tolist()]
...:
Out[181]:
var1 var2 var3
0 a 1 XX
1 b 1 XX
2 c 1 XX
3 d 2 ZZ
4 e 2 ZZ
5 f 2 ZZ
6 x 2 ZZ
7 y 2 ZZ
OLD answer:
Inspired by @AFinkelstein solution, i wanted to make it bit more generalized which could be applied to DF with more than two columns and as fast, well almost, as fast as AFinkelstein's solution):
In [2]: df = pd.DataFrame(
...: [{'var1': 'a,b,c', 'var2': 1, 'var3': 'XX'},
...: {'var1': 'd,e,f,x,y', 'var2': 2, 'var3': 'ZZ'}]
...: )
In [3]: df
Out[3]:
var1 var2 var3
0 a,b,c 1 XX
1 d,e,f,x,y 2 ZZ
In [4]: (df.set_index(df.columns.drop('var1',1).tolist())
...: .var1.str.split(',', expand=True)
...: .stack()
...: .reset_index()
...: .rename(columns={0:'var1'})
...: .loc[:, df.columns]
...: )
Out[4]:
var1 var2 var3
0 a 1 XX
1 b 1 XX
2 c 1 XX
3 d 2 ZZ
4 e 2 ZZ
5 f 2 ZZ
6 x 2 ZZ
7 y 2 ZZ
Set a DateTime database field to "Now"
Use GETDATE()
Returns the current database system timestamp as a datetime value without the database time zone offset. This value is derived from the operating system of the computer on which the instance of SQL Server is running.
UPDATE table SET date = GETDATE()
Specifying and saving a figure with exact size in pixels
plt.imsave worked for me. You can find the documentation here: https://matplotlib.org/3.2.1/api/_as_gen/matplotlib.pyplot.imsave.html
#file_path = directory address where the image will be stored along with file name and extension
#array = variable where the image is stored. I think for the original post this variable is im_np
plt.imsave(file_path, array)
Need to navigate to a folder in command prompt
Just use the change directory (cd) command.
cd d:\windows\movie
Build Step Progress Bar (css and jquery)
This is how I have achieved it using purely CSS and HTML (no JavaScript/images etc.).
It gracefully degrades in most browsers (I do need to add in a fix for lack of last-of-type in < IE9).
Messagebox with input field
You can do it by making form and displaying it using ShowDialogBox....
Form.ShowDialog Method - Shows the form as a modal dialog box.
Example:
public void ShowMyDialogBox()
{
Form2 testDialog = new Form2();
// Show testDialog as a modal dialog and determine if DialogResult = OK.
if (testDialog.ShowDialog(this) == DialogResult.OK)
{
// Read the contents of testDialog's TextBox.
this.txtResult.Text = testDialog.TextBox1.Text;
}
else
{
this.txtResult.Text = "Cancelled";
}
testDialog.Dispose();
}
Get POST data in C#/ASP.NET
c.Request["AP"] will read posted values. Also you need to use a submit button to post the form:
<input type="submit" value="Submit" />
instead of
<input type=button value="Submit" />
Combining border-top,border-right,border-left,border-bottom in CSS
Your case is an extreme one, but here is a solution for others that fits a more common scenario of wanting to style fewer than 4 borders exactly the same.
border: 1px dashed red; border-width: 1px 1px 0 1px;
that is a little shorter, and maybe easier to read than
border-top: 1px dashed red; border-right: 1px dashed red; border-left: 1px dashed red;
or
border-color: red; border-style: dashed; border-width: 1px 1px 0 1px;
How to clear all input fields in a specific div with jQuery?
Here is Beena's answer in ES6 Sans the JQuery dependency.. Thank's Beena!
let resetFormObject = (elementID)=> {
document.getElementById(elementID).getElementsByTagName('input').forEach((input)=>{
switch(input.type) {
case 'password':
case 'text':
case 'textarea':
case 'file':
case 'select-one':
case 'select-multiple':
case 'date':
case 'number':
case 'tel':
case 'email':
input.value = '';
break;
case 'checkbox':
case 'radio':
input.checked = false;
break;
}
});
}
Using floats with sprintf() in embedded C
Similar to paxdiablo above. This code, inserted in a wider app, works fine with STM32 NUCLEO-F446RE.
#include <stdio.h>
#include <math.h>
#include <string.h>
void IntegFract(char *pcIntegStr, char *pcFractStr, double dbValue, int iPrecis);
main()
{
char acIntegStr[9], acFractStr[9], char counter_buff[30];
double seconds_passed = 123.0567;
IntegFract(acIntegStr, acFractStr, seconds_passed, 3);
sprintf(counter_buff, "Time: %s.%s Sec", acIntegStr, acFractStr);
}
void IntegFract(char *pcIntegStr, char *pcFractStr, double dbValue, int
iPrecis)
{
int iIntegValue = dbValue;
int iFractValue = (dbValue - iIntegValue) * pow(10, iPrecis);
itoa(iIntegValue, pcIntegStr, 10);
itoa(iFractValue, pcFractStr, 10);
size_t length = strlen(pcFractStr);
char acTemp[9] = "";
while (length < iPrecis)
{
strcat(acTemp, "0");
length++;
}
strcat(acTemp, pcFractStr);
strcpy(pcFractStr, acTemp);
}
counter_buff would contain 123.056 .
How to declare and display a variable in Oracle
Did you recently switch from MySQL and are now longing for the logical equivalents of its more simple commands in Oracle? Because that is the case for me and I had the very same question. This code will give you a quick and dirty print which I think is what you're looking for:
Variable n number
begin
:n := 1;
end;
print n
The middle section is a PL/SQL bit that binds the variable. The output from print n is in column form, and will not just give the value of n, I'm afraid. When I ran it in Toad 11 it returned like this
n
---------
1
I hope that helps
"installation of package 'FILE_PATH' had non-zero exit status" in R
Did you check the gsl package in your system. Try with this:
ldconfig-p | grep gsl
If gsl is installed, it will display the configuration path. If it is not in the standard path /usr/lib/ then you need to do the following in bash:
export PATH=$PATH:/your/path/to/gsl-config
If gsl is not installed, simply do
sudo apt-get install libgsl0ldbl
sudo apt-get install gsl-bin libgsl0-dev
I had a problem with the mvabund package and this fixed the error
Cheers!
How to change legend title in ggplot
I didn't dig in much into this but because you used fill=cond in ggplot(),
+ labs(color='NEW LEGEND TITLE')
might not have worked. However it you replace color by fill, it works!
+ labs(fill='NEW LEGEND TITLE')
This worked for me in ggplot2_2.1.0
Create a string and append text to it
Use the string concatenation operator:
Dim str As String = New String("") & "some other string"
Strings in .NET are immutable and thus there exist no concept of appending strings. All string modifications causes a new string to be created and returned.
This obviously cause a terrible performance. In common everyday code this isn't an issue, but if you're doing intensive string operations in which time is of the essence then you will benefit from looking into the StringBuilder class. It allow you to queue appends. Once you're done appending you can ask it to actually perform all the queued operations.
See "How to: Concatenate Multiple Strings" for more information on both methods.
Maven compile: package does not exist
Not sure if there was file corruption or what, but after confirming proper pom configuration I was able to resolve this issue by deleting the jar from my local m2 repository, forcing Maven to download it again when I ran the tests.
can you add HTTPS functionality to a python flask web server?
this also works in a pinch
from flask import Flask, jsonify
from OpenSSL import SSL
context = SSL.Context(SSL.PROTOCOL_TLSv1_2)
context.use_privatekey_file('server.key')
context.use_certificate_file('server.crt')
app = Flask(__name__)
@app.route('/')
def index():
return 'Flask is running!'
@app.route('/data')
def names():
data = {"names": ["John", "Jacob", "Julie", "Jennifer"]}
return jsonify(data)
#if __name__ == '__main__':
# app.run()
if __name__ == '__main__':
app.run(host='127.0.0.1', debug=True, ssl_context=context)
how to hide keyboard after typing in EditText in android?
You can see marked answer on top. But i used getDialog().getCurrentFocus() and working well. I post this answer cause i cant type "this" in my oncreatedialog.
So this is my answer. If you tried marked answer and not worked , you can simply try this:
InputMethodManager inputManager = (InputMethodManager) getActivity().getApplicationContext().getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager.hideSoftInputFromWindow(getDialog().getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
Android eclipse DDMS - Can't access data/data/ on phone to pull files
Much simpler than messing around with permissions in the android FS (which always feels like
a hack for me - because i believe there must be a kind of integrated way) is just to:
Allow ADB root access and Restart the deamon with root permissions.
- First be sure that ADB can have root access on your device (or emulator):
(Settings->Developer Options->Root-Access for ADBorApps & ADB. - Restart the ADB-Service with root-permissions:
Open acommand promptand type:adb.exe root - Restart ADM (Android Device Manager):
Enjoybrowsing all files - To negate this process:
Typeadb.exe unrootin yourcommand prompt.
How do I convert a decimal to an int in C#?
You can't.
Well, of course you could, however an int (System.Int32) is not big enough to hold every possible decimal value.
That means if you cast a decimal that's larger than int.MaxValue you will overflow, and if the decimal is smaller than int.MinValue, it will underflow.
What happens when you under/overflow? One of two things. If your build is unchecked (i.e., the CLR doesn't care if you do), your application will continue after the value over/underflows, but the value in the int will not be what you expected. This can lead to intermittent bugs and may be hard to fix. You'll end up your application in an unknown state which may result in your application corrupting whatever important data its working on. Not good.
If your assembly is checked (properties->build->advanced->check for arithmetic overflow/underflow or the /checked compiler option), your code will throw an exception when an under/overflow occurs. This is probably better than not; however the default for assemblies is not to check for over/underflow.
The real question is "what are you trying to do?" Without knowing your requirements, nobody can tell you what you should do in this case, other than the obvious: DON'T DO IT.
If you specifically do NOT care, the answers here are valid. However, you should communicate your understanding that an overflow may occur and that it doesn't matter by wrapping your cast code in an unchecked block
unchecked
{
// do your conversions that may underflow/overflow here
}
That way people coming behind you understand you don't care, and if in the future someone changes your builds to /checked, your code won't break unexpectedly.
If all you want to do is drop the fractional portion of the number, leaving the integral part, you can use Math.Truncate.
decimal actual = 10.5M;
decimal expected = 10M;
Assert.AreEqual(expected, Math.Truncate(actual));
How to fix error ::Format of the initialization string does not conform to specification starting at index 0::
I was getting this exception, fixed it by adding throwIfV1Schema: false to my DbContext constructor:
public class AppDb : IdentityDbContext<User>
{
public AppDb()
: base("DefaultConnection", throwIfV1Schema: false)
{
}
}
How does the "view" method work in PyTorch?
weights.reshape(a, b) will return a new tensor with the same data as weights with size (a, b) as in it copies the data to another part of memory.
weights.resize_(a, b) returns the same tensor with a different shape. However, if the new shape results in fewer elements than the original tensor, some elements will be removed from the tensor (but not from memory). If the new shape results in more elements than the original tensor, new elements will be uninitialized in memory.
weights.view(a, b) will return a new tensor with the same data as weights with size (a, b)
How to copy a char array in C?
for integer types
#include <string.h>
int array1[10] = {0,1,2,3,4,5,6,7,8,9};
int array2[10];
memcpy(array2,array1,sizeof(array1)); // memcpy("destination","source","size")
xsl: how to split strings?
I. Plain XSLT 1.0 solution:
This transformation:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:template match="text()" name="split">
<xsl:param name="pText" select="."/>
<xsl:if test="string-length($pText)">
<xsl:if test="not($pText=.)">
<br />
</xsl:if>
<xsl:value-of select=
"substring-before(concat($pText,';'),';')"/>
<xsl:call-template name="split">
<xsl:with-param name="pText" select=
"substring-after($pText, ';')"/>
</xsl:call-template>
</xsl:if>
</xsl:template>
</xsl:stylesheet>
when applied on this XML document:
<t>123 Elm Street;PO Box 222;c/o James Jones</t>
produces the wanted, corrected result:
123 Elm Street<br />PO Box 222<br />c/o James Jones
II. FXSL 1 (for XSLT 1.0):
Here we just use the FXSL template str-map (and do not have to write recursive template for the 999th time):
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:f="http://fxsl.sf.net/"
xmlns:testmap="testmap"
exclude-result-prefixes="xsl f testmap"
>
<xsl:import href="str-dvc-map.xsl"/>
<testmap:testmap/>
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:template match="/">
<xsl:variable name="vTestMap" select="document('')/*/testmap:*[1]"/>
<xsl:call-template name="str-map">
<xsl:with-param name="pFun" select="$vTestMap"/>
<xsl:with-param name="pStr" select=
"'123 Elm Street;PO Box 222;c/o James Jones'"/>
</xsl:call-template>
</xsl:template>
<xsl:template name="replace" mode="f:FXSL"
match="*[namespace-uri() = 'testmap']">
<xsl:param name="arg1"/>
<xsl:choose>
<xsl:when test="not($arg1=';')">
<xsl:value-of select="$arg1"/>
</xsl:when>
<xsl:otherwise><br /></xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
when this transformation is applied on any XML document (not used), the same, wanted correct result is produced:
123 Elm Street<br/>PO Box 222<br/>c/o James Jones
III. Using XSLT 2.0
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:template match="text()">
<xsl:for-each select="tokenize(.,';')">
<xsl:sequence select="."/>
<xsl:if test="not(position() eq last())"><br /></xsl:if>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
when this transformation is applied on this XML document:
<t>123 Elm Street;PO Box 222;c/o James Jones</t>
the wanted, correct result is produced:
123 Elm Street<br />PO Box 222<br />c/o James Jones
Import / Export database with SQL Server Server Management Studio
for Microsoft SQL Server Management Studio 2012,2008.. First Copy your database file .mdf and log file .ldf & Paste in your sql server install file in Programs Files->Microsoft SQL Server->MSSQL10.SQLEXPRESS->MSSQL->DATA. Then open Microsoft Sql Server . Right Click on Databases -> Select Attach...option.
How to append elements into a dictionary in Swift?
I added Dictionary extension
extension Dictionary {
func cloneWith(_ dict: [Key: Value]) -> [Key: Value] {
var result = self
dict.forEach { key, value in result[key] = value }
return result
}
}
you can use cloneWith like this
newDictionary = dict.reduce([3 : "efg"]) { r, e in r.cloneWith(e) }
CSS transition fade in
CSS Keyframes support is pretty good these days:
.fade-in {_x000D_
opacity: 1;_x000D_
animation-name: fadeInOpacity;_x000D_
animation-iteration-count: 1;_x000D_
animation-timing-function: ease-in;_x000D_
animation-duration: 2s;_x000D_
}_x000D_
_x000D_
@keyframes fadeInOpacity {_x000D_
0% {_x000D_
opacity: 0;_x000D_
}_x000D_
100% {_x000D_
opacity: 1;_x000D_
}_x000D_
}<h1 class="fade-in">Fade Me Down Scotty</h1>Angular JS update input field after change
Create a directive and put a watch on it.
app.directive("myApp", function(){
link:function(scope){
function:getTotal(){
..do your maths here
}
scope.$watch('one', getTotals());
scope.$watch('two', getTotals());
}
})
Connect Android to WiFi Enterprise network EAP(PEAP)
Thanks for enlightening us Cypawer.
I also tried this app https://play.google.com/store/apps/details?id=com.oneguyinabasement.leapwifi
and it worked flawlessly.
How do you perform a left outer join using linq extension methods
Improving on Ocelot20's answer, if you have a table you're left outer joining with where you just want 0 or 1 rows out of it, but it could have multiple, you need to Order your joined table:
var qry = Foos.GroupJoin(
Bars.OrderByDescending(b => b.Id),
foo => foo.Foo_Id,
bar => bar.Foo_Id,
(f, bs) => new { Foo = f, Bar = bs.FirstOrDefault() });
Otherwise which row you get in the join is going to be random (or more specifically, whichever the db happens to find first).
'adb' is not recognized as an internal or external command, operable program or batch file
This is where I found it:
C:\Users\<USER>\AppData\Local\Android\sdk\platform-tools
I had to put the complete path into the file explorer. I couldn't just click down to it because the directories are hidden.
I found this path listed in Android studio:
Tools > Android > SDK Manager > SDK Tools
Processing Symbol Files in Xcode
I know that this is not a technical solution but I had my iphone connected with the computer by cable and disconnecting the device from the computer and connecting it again (by cable again) worked for me as I could not solved it with the solutions that are provided before.
Python 3: UnboundLocalError: local variable referenced before assignment
I don't like this behavior, but this is how Python works. The question has already been answered by others, but for completeness, let me point out that Python 2 has more such quirks.
def f(x):
return x
def main():
print f(3)
if (True):
print [f for f in [1, 2, 3]]
main()
Python 2.7.6 returns an error:
Traceback (most recent call last):
File "weird.py", line 9, in <module>
main()
File "weird.py", line 5, in main
print f(3)
UnboundLocalError: local variable 'f' referenced before assignment
Python sees the f is used as a local variable in [f for f in [1, 2, 3]], and decides that it is also a local variable in f(3). You could add a global f statement:
def f(x):
return x
def main():
global f
print f(3)
if (True):
print [f for f in [1, 2, 3]]
main()
It does work; however, f becomes 3 at the end... That is, print [f for f in [1, 2, 3]] now changes the global variable f to 3, so it is not a function any more.
Fortunately, it works fine in Python3 after adding the parentheses to print.
How to use graphics.h in codeblocks?
You don't only need the header file, you need the library that goes with it. Anyway, the include folder is not automatically loaded, you must configure your project to do so. Right-click on it : Build options > Search directories > Add. Choose your include folder, keep the path relative.
Edit For further assistance, please give details about the library you're trying to load (which provides a graphics.h file.)
How to add a custom button to the toolbar that calls a JavaScript function?
This article may be useful too http://mito-team.com/article/2012/collapse-button-for-ckeditor-for-drupal
There are code samples and step-by-step guide about building your own CKEditor plugin with custom button.
How to pass password automatically for rsync SSH command?
Use a ssh key.
Look at ssh-keygen and ssh-copy-id.
After that you can use an rsync this way :
rsync -a --stats --progress --delete /home/path server:path
What's the difference between Docker Compose vs. Dockerfile
Dockerfile and Docker Compose are two different concepts in Dockerland. When we talk about Docker, the first things that come to mind are orchestration, OS level virtualization, images, containers, etc.. I will try to explain each as follows:
Image: An image is an immutable, shareable file that is stored in a Docker-trusted registry. A Docker image is built up from a series of read-only layers. Each layer represents an instruction that is being given in the image’s Dockerfile. An image holds all the required binaries to run.
Container: An instance of an image is called a container. A container is just an executable image binary that is to be run by the host OS. A running image is a container.
Dockerfile:
A Dockerfile is a text document that contains all of the commands / build instructions, a user could call on the command line to assemble an image. This will be saved as a Dockerfile. (Note the lowercase 'f'.)
Docker-Compose:
Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a YAML file to configure your application’s services (containers). Then, with a single command, you create and start all the services from your configuration.
The Compose file would be saved as docker-compose.yml.
SQL Server JOIN missing NULL values
Try using additional condition in join:
SELECT Table1.Col1, Table1.Col2, Table1.Col3, Table2.Col4
FROM Table1
INNER JOIN Table2
ON (Table1.Col1 = Table2.Col1
OR (Table1.Col1 IS NULL AND Table2.Col1 IS NULL)
)
SQL: How To Select Earliest Row
In this case a relatively simple GROUP BY can work, but in general, when there are additional columns where you can't order by but you want them from the particular row which they are associated with, you can either join back to the detail using all the parts of the key or use OVER():
Runnable example (Wofkflow20 error in original data corrected)
;WITH partitioned AS (
SELECT company
,workflow
,date
,other_columns
,ROW_NUMBER() OVER(PARTITION BY company, workflow
ORDER BY date) AS seq
FROM workflowTable
)
SELECT *
FROM partitioned WHERE seq = 1
Remove padding or margins from Google Charts
There's a theme available specifically for this
options: {
theme: 'maximized'
}
from the Google chart docs:
Currently only one theme is available:
'maximized' - Maximizes the area of the chart, and draws the legend and all of the labels inside the chart area. Sets the following options:
chartArea: {width: '100%', height: '100%'},
legend: {position: 'in'},
titlePosition: 'in', axisTitlesPosition: 'in',
hAxis: {textPosition: 'in'}, vAxis: {textPosition: 'in'}
How do I use boolean variables in Perl?
My favourites have always been
use constant FALSE => 1==0;
use constant TRUE => not FALSE;
which is completely independent from the internal representation.
Compilation fails with "relocation R_X86_64_32 against `.rodata.str1.8' can not be used when making a shared object"
I had the same problem. Try recompiling using -fPIC flag.
postgresql return 0 if returned value is null
I can think of 2 ways to achieve this:
IFNULL():
The IFNULL() function returns a specified value if the expression is NULL.If the expression is NOT NULL, this function returns the expression.
Syntax:
IFNULL(expression, alt_value)
Example of IFNULL() with your query:
SELECT AVG( price )
FROM(
SELECT *, cume_dist() OVER ( ORDER BY price DESC ) FROM web_price_scan
WHERE listing_Type = 'AARM'
AND u_kbalikepartnumbers_id = 1000307
AND ( EXTRACT( DAY FROM ( NOW() - dateEnded ) ) ) * 24 < 48
AND IFNULL( price, 0 ) > ( SELECT AVG( IFNULL( price, 0 ) )* 0.50
FROM ( SELECT *, cume_dist() OVER ( ORDER BY price DESC )
FROM web_price_scan
WHERE listing_Type='AARM'
AND u_kbalikepartnumbers_id = 1000307
AND ( EXTRACT( DAY FROM ( NOW() - dateEnded ) ) ) * 24 < 48
) g
WHERE cume_dist < 0.50
)
AND IFNULL( price, 0 ) < ( SELECT AVG( IFNULL( price, 0 ) ) *2
FROM( SELECT *, cume_dist() OVER ( ORDER BY price desc )
FROM web_price_scan
WHERE listing_Type='AARM'
AND u_kbalikepartnumbers_id = 1000307
AND ( EXTRACT( DAY FROM ( NOW() - dateEnded ) ) ) * 24 < 48
) d
WHERE cume_dist < 0.50)
)s
HAVING COUNT(*) > 5
COALESCE()
The COALESCE() function returns the first non-null value in a list.
Syntax:
COALESCE(val1, val2, ...., val_n)
Example of COALESCE() with your query:
SELECT AVG( price )
FROM(
SELECT *, cume_dist() OVER ( ORDER BY price DESC ) FROM web_price_scan
WHERE listing_Type = 'AARM'
AND u_kbalikepartnumbers_id = 1000307
AND ( EXTRACT( DAY FROM ( NOW() - dateEnded ) ) ) * 24 < 48
AND COALESCE( price, 0 ) > ( SELECT AVG( COALESCE( price, 0 ) )* 0.50
FROM ( SELECT *, cume_dist() OVER ( ORDER BY price DESC )
FROM web_price_scan
WHERE listing_Type='AARM'
AND u_kbalikepartnumbers_id = 1000307
AND ( EXTRACT( DAY FROM ( NOW() - dateEnded ) ) ) * 24 < 48
) g
WHERE cume_dist < 0.50
)
AND COALESCE( price, 0 ) < ( SELECT AVG( COALESCE( price, 0 ) ) *2
FROM( SELECT *, cume_dist() OVER ( ORDER BY price desc )
FROM web_price_scan
WHERE listing_Type='AARM'
AND u_kbalikepartnumbers_id = 1000307
AND ( EXTRACT( DAY FROM ( NOW() - dateEnded ) ) ) * 24 < 48
) d
WHERE cume_dist < 0.50)
)s
HAVING COUNT(*) > 5
How to overwrite the previous print to stdout in python?
for x in range(10):
time.sleep(0.5) # shows how its working
print("\r {}".format(x), end="")
time.sleep(0.5) is to show how previous output is erased and new output is printed "\r" when its at the start of print message , it gonna erase previous output before new output.
How to retrieve the current value of an oracle sequence without increment it?
select MY_SEQ_NAME.currval from DUAL;
Keep in mind that it only works if you ran select MY_SEQ_NAME.nextval from DUAL; in the current sessions.
Convert string to date in bash
just use the -d option of the date command, e.g.
date -d '20121212' +'%Y %m'
How can I restart a Java application?
Basically, you can't. At least not in a reliable way. However, you shouldn't need to.
The can't part
To restart a Java program, you need to restart the JVM. To restart the JVM you need to
Locate the
javalauncher that was used. You may try withSystem.getProperty("java.home")but there's no guarantee that this will actually point to the launcher that was used to launch your application. (The value returned may not point to the JRE used to launch the application or it could have been overridden by-Djava.home.)You would presumably want to honor the original memory settings etc (
-Xmx,-Xms, …) so you need to figure out which settings where used to start the first JVM. You could try usingManagementFactory.getRuntimeMXBean().getInputArguments()but there's no guarantee that this will reflect the settings used. This is even spelled out in the documentation of that method:Typically, not all command-line options to the 'java' command are passed to the Java virtual machine. Thus, the returned input arguments may not include all command-line options.
If your program reads input from
Standard.inthe original stdin will be lost in the restart.Lots of these tricks and hacks will fail in the presence of a
SecurityManager.
The shouldn't need part
I recommend you to design your application so that it is easy to clean every thing up and after that create a new instance of your "main" class.
Many applications are designed to do nothing but create an instance in the main-method:
public class MainClass {
...
public static void main(String[] args) {
new MainClass().launch();
}
...
}
By using this pattern, it should be easy enough to do something like:
public class MainClass {
...
public static void main(String[] args) {
boolean restart;
do {
restart = new MainClass().launch();
} while (restart);
}
...
}
and let launch() return true if and only if the application was shut down in a way that it needs to be restarted.
C#/Linq: Apply a mapping function to each element in an IEnumerable?
You're looking for Select which can be used to transform\project the input sequence:
IEnumerable<string> strings = integers.Select(i => i.ToString());
psql: FATAL: database "<user>" does not exist
Post installation of postgres, in my case version is 12.2, I did run the below command createdb.
$ createdb `whoami`
$ psql
psql (12.2)
Type "help" for help.
macuser=#
Android Studio emulator does not come with Play Store for API 23
I've had to do this recently on the API 23 emulator, and followed this guide. It works for API 23 emulator, so you shouldn't have a problem.
Note: All credit goes to the author of the linked blog post (pyoor). I'm just posting it here in case the link breaks for any reason.
....
Download the GAPPS Package
Next we need to pull down the appropriate Google Apps package that matches our Android AVD version. In this case we’ll be using the 'gapps-lp-20141109-signed.zip' package. You can download that file from BasketBuild here.
[pyoor@localhost]$ md5sum gapps-lp-20141109-signed.zip
367ce76d6b7772c92810720b8b0c931e gapps-lp-20141109-signed.zip
In order to install Google Play, we’ll need to push the following 4 APKs to our AVD (located in ./system/priv-app/):
GmsCore.apk, GoogleServicesFramework.apk, GoogleLoginService.apk, Phonesky.apk
[pyoor@localhost]$ unzip -j gapps-lp-20141109-signed.zip \
system/priv-app/GoogleServicesFramework/GoogleServicesFramework.apk \
system/priv-app/GoogleLoginService/GoogleLoginService.apk \
system/priv-app/Phonesky/Phonesky.apk \
system/priv-app/GmsCore/GmsCore.apk -d ./
Push APKs to the Emulator
With our APKs extracted, let’s launch our AVD using the following command.
[pyoor@localhost tools]$ ./emulator @<YOUR_DEVICE_NAME> -no-boot-anim
This may take several minutes the first time as the AVD is created. Once started, we need to remount the AVDs system partition as read/write so that we can push our packages onto the device.
[pyoor@localhost]$ cd ~/android-sdk/platform-tools/
[pyoor@localhost platform-tools]$ ./adb remount
Next, push the APKs to our AVD:
[pyoor@localhost platform-tools]$ ./adb push GmsCore.apk /system/priv-app/
[pyoor@localhost platform-tools]$ ./adb push GoogleServicesFramework.apk /system/priv-app/
[pyoor@localhost platform-tools]$ ./adb push GoogleLoginService.apk /system/priv-app/
[pyoor@localhost platform-tools]$ ./adb push Phonesky.apk /system/priv-app
Profit!
And finally, reboot the emualator using the following commands:
[pyoor@localhost platform-tools]$ ./adb shell stop && ./adb shell start
Once the emulator restarts, we should see the Google Play package appear within the menu launcher. After associating a Google account with this AVD we now have a fully working version of Google Play running under our emulator.
Eclipse: How to install a plugin manually?
You can try this
click Help>Install New Software on the menu bar
Angular 5 Reactive Forms - Radio Button Group
IF you want to derive usg Boolean true False need to add "[]" around value
<form [formGroup]="form">
<input type="radio" [value]=true formControlName="gender" >Male
<input type="radio" [value]=false formControlName="gender">Female
</form>
Check substring exists in a string in C
This code implements the logic of how search works (one of the ways) without using any ready-made function:
public int findSubString(char[] original, char[] searchString)
{
int returnCode = 0; //0-not found, -1 -error in imput, 1-found
int counter = 0;
int ctr = 0;
if (original.Length < 1 || (original.Length)<searchString.Length || searchString.Length<1)
{
returnCode = -1;
}
while (ctr <= (original.Length - searchString.Length) && searchString.Length > 0)
{
if ((original[ctr]) == searchString[0])
{
counter = 0;
for (int count = ctr; count < (ctr + searchString.Length); count++)
{
if (original[count] == searchString[counter])
{
counter++;
}
else
{
counter = 0;
break;
}
}
if (counter == (searchString.Length))
{
returnCode = 1;
}
}
ctr++;
}
return returnCode;
}
What are the differences between struct and class in C++?
According to Stroustrup in the C++ Programming Language:
Which style you use depends on circumstances and taste. I usually prefer to use
structfor classes that have all data public. I think of such classes as "not quite proper types, just data structures."
Functionally, there is no difference other than the public / private
Adding dictionaries together, Python
>>> dic0 = {'dic0':0}
>>> dic1 = {'dic1':1}
>>> ndic = dict(dic0.items() + dic1.items())
>>> ndic
{'dic0': 0, 'dic1': 1}
>>>
Remove all non-"word characters" from a String in Java, leaving accented characters?
You might want to remove the accents and diacritic signs first, then on each character position check if the "simplified" string is an ascii letter - if it is, the original position shall contain word characters, if not, it can be removed.
Getting current unixtimestamp using Moment.js
For anyone who finds this page looking for unix timestamp w/ milliseconds, the documentation says
moment().valueOf()
or
+moment();
you can also get it through moment().format('x') (or .format('X') [capital X] for unix seconds with decimal milliseconds), but that will give you a string. Which moment.js won't actually parse back afterwards, unless you convert/cast it back to a number first.
how to display toolbox on the left side of window of Visual Studio Express for windows phone 7 development?
Sometimes you can just do 'Window -> Reset Window Layout', and that'll work :)
What is the list of supported languages/locales on Android?
I think the best way is to run a sample code to find the supported locales. I've made a code snippet that does it:
final Locale[] availableLocales=Locale.getAvailableLocales();
for(final Locale locale : availableLocales)
Log.d("Applog",":"+locale.getDisplayName()+":"+locale.getLanguage()+":"
+locale.getCountry()+":values-"+locale.toString().replace("_","-r"));
the columns are : displayName (how it looks to the user), the locale, the variant, and the folder that the developer is supposed to put the strings into.
Here's a table I've made out of the 5.0.1 emulator: https://docs.google.com/spreadsheets/d/1Hx1CTPT82qFSbzuWiU1nyGROCNM6HKssKCPhxinvdww/
Weird thing is that for some cases, I got "#" which is something I've never seen before. It's probably quite new, and the rule I've chosen is probably incorrect for those cases (though it still compiles fine when I put such folders and files), but for the rest it should be fine.
If anyone knows about what the "#" is, and how to handle it, please let me know.
Use grep to report back only line numbers
Bash version
lineno=$(grep -n "pattern" filename)
lineno=${lineno%%:*}
PYTHONPATH vs. sys.path
If the only reason to modify the path is for developers working from their working tree, then you should use an installation tool to set up your environment for you. virtualenv is very popular, and if you are using setuptools, you can simply run setup.py develop to semi-install the working tree in your current Python installation.
Remove the last character from a string
First, I try without a space, rtrim($arraynama, ","); and get an error result.
Then I add a space and get a good result:
$newarraynama = rtrim($arraynama, ", ");
Remove the complete styling of an HTML button/submit
In bootstrap 4 is easiest.
You can use the classes:
bg-transparent and border-0
Can I exclude some concrete urls from <url-pattern> inside <filter-mapping>?
I was able to handle this in Spring 2 as following
private boolean isInPath(ServletRequest request) {
String PATH_TO_VALIDATE = "/path/";
String path = ((HttpServletRequest) request).getRequestURI();
return path != null && path.toLowerCase().contains(PATH_TO_VALIDATE);
}
What is the Swift equivalent of isEqualToString in Objective-C?
For the UITextField text comparison I am using below code and working fine for me, let me know if you find any error.
if(txtUsername.text.isEmpty || txtPassword.text.isEmpty)
{
//Do some stuff
}
else if(txtUsername.text == "****" && txtPassword.text == "****")
{
//Do some stuff
}
How to develop a soft keyboard for Android?
Create Custom Key Board for Own EditText
In this post i Created Simple Keyboard which contains Some special keys like ( France keys ) and it's supported Capital letters and small letters and Number keys and some Symbols .
package sra.keyboard;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;
public class Main extends Activity implements OnTouchListener, OnClickListener,
OnFocusChangeListener {
private EditText mEt, mEt1; // Edit Text boxes
private Button mBSpace, mBdone, mBack, mBChange, mNum;
private RelativeLayout mLayout, mKLayout;
private boolean isEdit = false, isEdit1 = false;
private String mUpper = "upper", mLower = "lower";
private int w, mWindowWidth;
private String sL[] = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j",
"k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w",
"x", "y", "z", "ç", "à", "é", "è", "û", "î" };
private String cL[] = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J",
"K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W",
"X", "Y", "Z", "ç", "à", "é", "è", "û", "î" };
private String nS[] = { "!", ")", "'", "#", "3", "$", "%", "&", "8", "*",
"?", "/", "+", "-", "9", "0", "1", "4", "@", "5", "7", "(", "2",
"\"", "6", "_", "=", "]", "[", "<", ">", "|" };
private Button mB[] = new Button[32];
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try {
setContentView(R.layout.main);
// adjusting key regarding window sizes
setKeys();
setFrow();
setSrow();
setTrow();
setForow();
mEt = (EditText) findViewById(R.id.xEt);
mEt.setOnTouchListener(this);
mEt.setOnFocusChangeListener(this);
mEt1 = (EditText) findViewById(R.id.et1);
mEt1.setOnTouchListener(this);
mEt1.setOnFocusChangeListener(this);
mEt.setOnClickListener(this);
mEt1.setOnClickListener(this);
mLayout = (RelativeLayout) findViewById(R.id.xK1);
mKLayout = (RelativeLayout) findViewById(R.id.xKeyBoard);
} catch (Exception e) {
Log.w(getClass().getName(), e.toString());
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
if (v == mEt) {
hideDefaultKeyboard();
enableKeyboard();
}
if (v == mEt1) {
hideDefaultKeyboard();
enableKeyboard();
}
return true;
}
@Override
public void onClick(View v) {
if (v == mBChange) {
if (mBChange.getTag().equals(mUpper)) {
changeSmallLetters();
changeSmallTags();
} else if (mBChange.getTag().equals(mLower)) {
changeCapitalLetters();
changeCapitalTags();
}
} else if (v != mBdone && v != mBack && v != mBChange && v != mNum) {
addText(v);
} else if (v == mBdone) {
disableKeyboard();
} else if (v == mBack) {
isBack(v);
} else if (v == mNum) {
String nTag = (String) mNum.getTag();
if (nTag.equals("num")) {
changeSyNuLetters();
changeSyNuTags();
mBChange.setVisibility(Button.INVISIBLE);
}
if (nTag.equals("ABC")) {
changeCapitalLetters();
changeCapitalTags();
}
}
}
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (v == mEt && hasFocus == true) {
isEdit = true;
isEdit1 = false;
} else if (v == mEt1 && hasFocus == true) {
isEdit = false;
isEdit1 = true;
}
}
private void addText(View v) {
if (isEdit == true) {
String b = "";
b = (String) v.getTag();
if (b != null) {
// adding text in Edittext
mEt.append(b);
}
}
if (isEdit1 == true) {
String b = "";
b = (String) v.getTag();
if (b != null) {
// adding text in Edittext
mEt1.append(b);
}
}
}
private void isBack(View v) {
if (isEdit == true) {
CharSequence cc = mEt.getText();
if (cc != null && cc.length() > 0) {
{
mEt.setText("");
mEt.append(cc.subSequence(0, cc.length() - 1));
}
}
}
if (isEdit1 == true) {
CharSequence cc = mEt1.getText();
if (cc != null && cc.length() > 0) {
{
mEt1.setText("");
mEt1.append(cc.subSequence(0, cc.length() - 1));
}
}
}
}
private void changeSmallLetters() {
mBChange.setVisibility(Button.VISIBLE);
for (int i = 0; i < sL.length; i++)
mB[i].setText(sL[i]);
mNum.setTag("12#");
}
private void changeSmallTags() {
for (int i = 0; i < sL.length; i++)
mB[i].setTag(sL[i]);
mBChange.setTag("lower");
mNum.setTag("num");
}
private void changeCapitalLetters() {
mBChange.setVisibility(Button.VISIBLE);
for (int i = 0; i < cL.length; i++)
mB[i].setText(cL[i]);
mBChange.setTag("upper");
mNum.setText("12#");
}
private void changeCapitalTags() {
for (int i = 0; i < cL.length; i++)
mB[i].setTag(cL[i]);
mNum.setTag("num");
}
private void changeSyNuLetters() {
for (int i = 0; i < nS.length; i++)
mB[i].setText(nS[i]);
mNum.setText("ABC");
}
private void changeSyNuTags() {
for (int i = 0; i < nS.length; i++)
mB[i].setTag(nS[i]);
mNum.setTag("ABC");
}
// enabling customized keyboard
private void enableKeyboard() {
mLayout.setVisibility(RelativeLayout.VISIBLE);
mKLayout.setVisibility(RelativeLayout.VISIBLE);
}
// Disable customized keyboard
private void disableKeyboard() {
mLayout.setVisibility(RelativeLayout.INVISIBLE);
mKLayout.setVisibility(RelativeLayout.INVISIBLE);
}
private void hideDefaultKeyboard() {
getWindow().setSoftInputMode(
WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
}
private void setFrow() {
w = (mWindowWidth / 13);
w = w - 15;
mB[16].setWidth(w);
mB[22].setWidth(w + 3);
mB[4].setWidth(w);
mB[17].setWidth(w);
mB[19].setWidth(w);
mB[24].setWidth(w);
mB[20].setWidth(w);
mB[8].setWidth(w);
mB[14].setWidth(w);
mB[15].setWidth(w);
mB[16].setHeight(50);
mB[22].setHeight(50);
mB[4].setHeight(50);
mB[17].setHeight(50);
mB[19].setHeight(50);
mB[24].setHeight(50);
mB[20].setHeight(50);
mB[8].setHeight(50);
mB[14].setHeight(50);
mB[15].setHeight(50);
}
private void setSrow() {
w = (mWindowWidth / 10);
mB[0].setWidth(w);
mB[18].setWidth(w);
mB[3].setWidth(w);
mB[5].setWidth(w);
mB[6].setWidth(w);
mB[7].setWidth(w);
mB[26].setWidth(w);
mB[9].setWidth(w);
mB[10].setWidth(w);
mB[11].setWidth(w);
mB[26].setWidth(w);
mB[0].setHeight(50);
mB[18].setHeight(50);
mB[3].setHeight(50);
mB[5].setHeight(50);
mB[6].setHeight(50);
mB[7].setHeight(50);
mB[9].setHeight(50);
mB[10].setHeight(50);
mB[11].setHeight(50);
mB[26].setHeight(50);
}
private void setTrow() {
w = (mWindowWidth / 12);
mB[25].setWidth(w);
mB[23].setWidth(w);
mB[2].setWidth(w);
mB[21].setWidth(w);
mB[1].setWidth(w);
mB[13].setWidth(w);
mB[12].setWidth(w);
mB[27].setWidth(w);
mB[28].setWidth(w);
mBack.setWidth(w);
mB[25].setHeight(50);
mB[23].setHeight(50);
mB[2].setHeight(50);
mB[21].setHeight(50);
mB[1].setHeight(50);
mB[13].setHeight(50);
mB[12].setHeight(50);
mB[27].setHeight(50);
mB[28].setHeight(50);
mBack.setHeight(50);
}
private void setForow() {
w = (mWindowWidth / 10);
mBSpace.setWidth(w * 4);
mBSpace.setHeight(50);
mB[29].setWidth(w);
mB[29].setHeight(50);
mB[30].setWidth(w);
mB[30].setHeight(50);
mB[31].setHeight(50);
mB[31].setWidth(w);
mBdone.setWidth(w + (w / 1));
mBdone.setHeight(50);
}
private void setKeys() {
mWindowWidth = getWindowManager().getDefaultDisplay().getWidth(); // getting
// window
// height
// getting ids from xml files
mB[0] = (Button) findViewById(R.id.xA);
mB[1] = (Button) findViewById(R.id.xB);
mB[2] = (Button) findViewById(R.id.xC);
mB[3] = (Button) findViewById(R.id.xD);
mB[4] = (Button) findViewById(R.id.xE);
mB[5] = (Button) findViewById(R.id.xF);
mB[6] = (Button) findViewById(R.id.xG);
mB[7] = (Button) findViewById(R.id.xH);
mB[8] = (Button) findViewById(R.id.xI);
mB[9] = (Button) findViewById(R.id.xJ);
mB[10] = (Button) findViewById(R.id.xK);
mB[11] = (Button) findViewById(R.id.xL);
mB[12] = (Button) findViewById(R.id.xM);
mB[13] = (Button) findViewById(R.id.xN);
mB[14] = (Button) findViewById(R.id.xO);
mB[15] = (Button) findViewById(R.id.xP);
mB[16] = (Button) findViewById(R.id.xQ);
mB[17] = (Button) findViewById(R.id.xR);
mB[18] = (Button) findViewById(R.id.xS);
mB[19] = (Button) findViewById(R.id.xT);
mB[20] = (Button) findViewById(R.id.xU);
mB[21] = (Button) findViewById(R.id.xV);
mB[22] = (Button) findViewById(R.id.xW);
mB[23] = (Button) findViewById(R.id.xX);
mB[24] = (Button) findViewById(R.id.xY);
mB[25] = (Button) findViewById(R.id.xZ);
mB[26] = (Button) findViewById(R.id.xS1);
mB[27] = (Button) findViewById(R.id.xS2);
mB[28] = (Button) findViewById(R.id.xS3);
mB[29] = (Button) findViewById(R.id.xS4);
mB[30] = (Button) findViewById(R.id.xS5);
mB[31] = (Button) findViewById(R.id.xS6);
mBSpace = (Button) findViewById(R.id.xSpace);
mBdone = (Button) findViewById(R.id.xDone);
mBChange = (Button) findViewById(R.id.xChange);
mBack = (Button) findViewById(R.id.xBack);
mNum = (Button) findViewById(R.id.xNum);
for (int i = 0; i < mB.length; i++)
mB[i].setOnClickListener(this);
mBSpace.setOnClickListener(this);
mBdone.setOnClickListener(this);
mBack.setOnClickListener(this);
mBChange.setOnClickListener(this);
mNum.setOnClickListener(this);
}
}
PDF Blob - Pop up window not showing content
I have been struggling for days finally the solution which worked for me is given below. I had to make the window.print() for PDF in new window needs to work.
var xhr = new XMLHttpRequest();
xhr.open('GET', pdfUrl, true);
xhr.responseType = 'blob';
xhr.onload = function(e) {
if (this['status'] == 200) {
var blob = new Blob([this['response']], {type: 'application/pdf'});
var url = URL.createObjectURL(blob);
var printWindow = window.open(url, '', 'width=800,height=500');
printWindow.print()
}
};
xhr.send();
Some notes on loading PDF & printing in a new window.
- Loading pdf in a new window via an iframe will work, but the print will not work if url is an external url.
- Browser pop ups must be allowed, then only it will work.
- If you try to load iframe from external url and try
window.print()you will get empty print or elements which excludesiframe. But you can trigger print manually, which will work.
Remove a string from the beginning of a string
Nice speed, but this is hard-coded to depend on the needle ending with _. Is there a general version? – toddmo Jun 29 at 23:26
A general version:
$parts = explode($start, $full, 2);
if ($parts[0] === '') {
$end = $parts[1];
} else {
$fail = true;
}
Some benchmarks:
<?php
$iters = 100000;
$start = "/aaaaaaa/bbbbbbbbbb";
$full = "/aaaaaaa/bbbbbbbbbb/cccccccccc/dddddddddd/eeeeeeeeee";
$end = '';
$fail = false;
$t0 = microtime(true);
for ($i = 0; $i < $iters; $i++) {
if (strpos($full, $start) === 0) {
$end = substr($full, strlen($start));
} else {
$fail = true;
}
}
$t = microtime(true) - $t0;
printf("%16s : %f s\n", "strpos+strlen", $t);
$t0 = microtime(true);
for ($i = 0; $i < $iters; $i++) {
$parts = explode($start, $full, 2);
if ($parts[0] === '') {
$end = $parts[1];
} else {
$fail = true;
}
}
$t = microtime(true) - $t0;
printf("%16s : %f s\n", "explode", $t);
On my quite old home PC:
$ php bench.php
Outputs:
strpos+strlen : 0.158388 s
explode : 0.126772 s
How to prevent page from reloading after form submit - JQuery
The <button> element, when placed in a form, will submit the form automatically unless otherwise specified. You can use the following 2 strategies:
- Use
<button type="button">to override default submission behavior - Use
event.preventDefault()in the onSubmit event to prevent form submission
Solution 1:
- Advantage: simple change to markup
- Disadvantage: subverts default form behavior, especially when JS is disabled. What if the user wants to hit "enter" to submit?
Insert extra type attribute to your button markup:
<button id="button" type="button" value="send" class="btn btn-primary">Submit</button>
Solution 2:
- Advantage: form will work even when JS is disabled, and respects standard form UI/UX such that at least one button is used for submission
Prevent default form submission when button is clicked. Note that this is not the ideal solution because you should be in fact listening to the submit event, not the button click event:
$(document).ready(function () {
// Listen to click event on the submit button
$('#button').click(function (e) {
e.preventDefault();
var name = $("#name").val();
var email = $("#email").val();
$.post("process.php", {
name: name,
email: email
}).complete(function() {
console.log("Success");
});
});
});
Better variant:
In this improvement, we listen to the submit event emitted from the <form> element:
$(document).ready(function () {
// Listen to submit event on the <form> itself!
$('#main').submit(function (e) {
e.preventDefault();
var name = $("#name").val();
var email = $("#email").val();
$.post("process.php", {
name: name,
email: email
}).complete(function() {
console.log("Success");
});
});
});
Even better variant: use .serialize() to serialize your form, but remember to add name attributes to your input:
The name attribute is required for .serialize() to work, as per jQuery's documentation:
For a form element's value to be included in the serialized string, the element must have a name attribute.
<input type="text" id="name" name="name" class="form-control mb-2 mr-sm-2 mb-sm-0" id="inlineFormInput" placeholder="Jane Doe">
<input type="text" id="email" name="email" class="form-control" id="inlineFormInputGroup" placeholder="[email protected]">
And then in your JS:
$(document).ready(function () {
// Listen to submit event on the <form> itself!
$('#main').submit(function (e) {
// Prevent form submission which refreshes page
e.preventDefault();
// Serialize data
var formData = $(this).serialize();
// Make AJAX request
$.post("process.php", formData).complete(function() {
console.log("Success");
});
});
});
Iterate over values of object
No, there's no direct method to do that with objects.
The Map type does have a values() method that returns an iterator for the values
Decode JSON with unknown structure
package main
import "encoding/json"
func main() {
in := []byte(`{ "votes": { "option_A": "3" } }`)
var raw map[string]interface{}
if err := json.Unmarshal(in, &raw); err != nil {
panic(err)
}
raw["count"] = 1
out, err := json.Marshal(raw)
if err != nil {
panic(err)
}
println(string(out))
}
Behaviour of increment and decrement operators in Python
There are no post/pre increment/decrement operators in python like in languages like C.
We can see ++ or -- as multiple signs getting multiplied, like we do in maths (-1) * (-1) = (+1).
E.g.
---count
Parses as
-(-(-count)))
Which translates to
-(+count)
Because, multiplication of - sign with - sign is +
And finally,
-count
onCreateOptionsMenu inside Fragments
I tried the @Alexander Farber and @Sino Raj answers. Both answers are nice, but I couldn't use the onCreateOptionsMenu inside my fragment, until I discover what was missing:
Add setSupportActionBar(toolbar) in my Activity, like this:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.id.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
I hope this answer can be helpful for someone with the same problem.
What is the purpose of backbone.js?
Backbone was created by Jeremy Ashkenas who also wrote CoffeeScript. As a JavaScript-heavy application, what we now know as Backbone was responsible for structuring the application into a coherent code base. Underscore.js, backbone's only dependency, was also part of the DocumentCloud application.
Backbone helps developers manage a data model in their client-side web app with as much discipline and structure as you would get in traditional server-side application logic.
Additional benefits of using Backbone.js
- See Backbone as a library, not as a framework
- Javascript is now getting organized in a structured way, the (MVVM) Model
- Large user community
How to detect my browser version and operating system using JavaScript?
PPK's script is THE authority for this kind of things, as @Jalpesh said, this might point you in the right way
var wn = window.navigator,
platform = wn.platform.toString().toLowerCase(),
userAgent = wn.userAgent.toLowerCase(),
storedName;
// ie
if (userAgent.indexOf('msie',0) !== -1) {
browserName = 'ie';
os = 'win';
storedName = userAgent.match(/msie[ ]\d{1}/).toString();
version = storedName.replace(/msie[ ]/,'');
browserOsVersion = browserName + version;
}
I ran into a merge conflict. How can I abort the merge?
You can either abort the merge step:
git merge --abort
else you can keep your changes (on which branch you are)
git checkout --ours file1 file2 ...
otherwise you can keep other branch changes
git checkout --theirs file1 file2 ...
Android webview slow
None of those answers was not helpful for me.
Finally I have found reason and solution. The reason was a lot of CSS3 filters (filter, -webkit-filter).
Solution
I have added detection of WebView in web page script in order to add class "lowquality" to HTML body. BTW. You can easily track WebView by setting user-agent in WebView settings. Then I created new CSS rule
body.lowquality * { filter: none !important; }
Select Tag Helper in ASP.NET Core MVC
You can also use IHtmlHelper.GetEnumSelectList.
// Summary:
// Returns a select list for the given TEnum.
//
// Type parameters:
// TEnum:
// Type to generate a select list for.
//
// Returns:
// An System.Collections.Generic.IEnumerable`1 containing the select list for the
// given TEnum.
//
// Exceptions:
// T:System.ArgumentException:
// Thrown if TEnum is not an System.Enum or if it has a System.FlagsAttribute.
IEnumerable<SelectListItem> GetEnumSelectList<TEnum>() where TEnum : struct;
Best way to handle list.index(might-not-exist) in python?
thing_index = thing_list.index(elem) if elem in thing_list else -1
One line. Simple. No exceptions.
How I add Headers to http.get or http.post in Typescript and angular 2?
This way I was able to call MyService
private REST_API_SERVER = 'http://localhost:4040/abc';
public sendGetRequest() {
var myFormData = { email: '[email protected]', password: '123' };
const headers = new HttpHeaders();
headers.append('Content-Type', 'application/json');
//HTTP POST REQUEST
this.httpClient
.post(this.REST_API_SERVER, myFormData, {
headers: headers,
})
.subscribe((data) => {
console.log("i'm from service............", data, myFormData, headers);
return data;
});
}
How to set a default value in react-select
To auto-select the value of in select.
<div className="form-group">
<label htmlFor="contactmethod">Contact Method</label>
<select id="contactmethod" className="form-control" value={this.state.contactmethod || ''} onChange={this.handleChange} name="contactmethod">
<option value='Email'>URL</option>
<option value='Phone'>Phone</option>
<option value="SMS">SMS</option>
</select>
</div>
Use the value attribute in the select tag
value={this.state.contactmethod || ''}
the solution is working for me.
Git merge master into feature branch
I add my answer, similar to others but maybe it will be the quickest one to read and implement.
NOTE: Rebase is not needed in this case.
Assume I have a repo1 and two branches master and dev-user.
dev-user is a branch done at a certain state of master.
Now assume that both dev-user and master advance.
At some point I want dev-user to get all the commits made in master.
How do I do it?
I go first in my repository root folder
cd name_of_the_repository
then
git checkout master
git pull
git checkout dev-user
git pull
git merge master
git push
I hope this helps someone else in the same situation.
LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria
Nobody has mentioned that FirstOrDefault translated in SQL does TOP 1 record, and SingleOrDefault does TOP 2, because it needs to know is there more than 1 record.
Get div's offsetTop positions in React
A better solution with ref to avoid findDOMNode that is discouraged.
...
onScroll() {
let offsetTop = this.instance.getBoundingClientRect().top;
}
...
render() {
...
<Component ref={(el) => this.instance = el } />
...