Sidenote, if you want to concatenate one string to all of the column names, you can just use this simple code.
colnames(df) <- paste("renamed_",colnames(df),sep="")
To Whom, deailing with share hosting environment and still chance to have Current PHP less than 7.0 Who does not have dirname( __FILE__, 2 );
it is possible to use following.
function dirname_safe($path, $level = 0){
$dir = explode(DIRECTORY_SEPARATOR, $path);
$level = $level * -1;
if($level == 0) $level = count($dir);
array_splice($dir, $level);
return implode($dir, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;
}
print_r(dirname_safe(__DIR__, 2));
For bootstrap 4 this works for me.
$(document).on('click', function(e) {
$('[data-toggle="popover"],[data-original-title]').each(function() {
if (!$(this).is(e.target) && $(this).has(e.target).length === 0 && $('.popover').has(e.target).length === 0) {
$(this).popover('hide')
}
});
});
working demo on jsfiddle link: https://jsfiddle.net/LabibMuhammadJamal/jys10nez/9/
This is a solution with extensive error reporting.
It would take an UTF-8 encoded byte array (where byte array is represented as array of numbers and each number is an integer between 0 and 255 inclusive) and will produce a JavaScript string of Unicode characters.
function getNextByte(value, startByteIndex, startBitsStr,
additional, index)
{
if (index >= value.length) {
var startByte = value[startByteIndex];
throw new Error("Invalid UTF-8 sequence. Byte " + startByteIndex
+ " with value " + startByte + " (" + String.fromCharCode(startByte)
+ "; binary: " + toBinary(startByte)
+ ") starts with " + startBitsStr + " in binary and thus requires "
+ additional + " bytes after it, but we only have "
+ (value.length - startByteIndex) + ".");
}
var byteValue = value[index];
checkNextByteFormat(value, startByteIndex, startBitsStr, additional, index);
return byteValue;
}
function checkNextByteFormat(value, startByteIndex, startBitsStr,
additional, index)
{
if ((value[index] & 0xC0) != 0x80) {
var startByte = value[startByteIndex];
var wrongByte = value[index];
throw new Error("Invalid UTF-8 byte sequence. Byte " + startByteIndex
+ " with value " + startByte + " (" +String.fromCharCode(startByte)
+ "; binary: " + toBinary(startByte) + ") starts with "
+ startBitsStr + " in binary and thus requires " + additional
+ " additional bytes, each of which shouls start with 10 in binary."
+ " However byte " + (index - startByteIndex)
+ " after it with value " + wrongByte + " ("
+ String.fromCharCode(wrongByte) + "; binary: " + toBinary(wrongByte)
+") does not start with 10 in binary.");
}
}
function fromUtf8 (str) {
var value = [];
var destIndex = 0;
for (var index = 0; index < str.length; index++) {
var code = str.charCodeAt(index);
if (code <= 0x7F) {
value[destIndex++] = code;
} else if (code <= 0x7FF) {
value[destIndex++] = ((code >> 6 ) & 0x1F) | 0xC0;
value[destIndex++] = ((code >> 0 ) & 0x3F) | 0x80;
} else if (code <= 0xFFFF) {
value[destIndex++] = ((code >> 12) & 0x0F) | 0xE0;
value[destIndex++] = ((code >> 6 ) & 0x3F) | 0x80;
value[destIndex++] = ((code >> 0 ) & 0x3F) | 0x80;
} else if (code <= 0x1FFFFF) {
value[destIndex++] = ((code >> 18) & 0x07) | 0xF0;
value[destIndex++] = ((code >> 12) & 0x3F) | 0x80;
value[destIndex++] = ((code >> 6 ) & 0x3F) | 0x80;
value[destIndex++] = ((code >> 0 ) & 0x3F) | 0x80;
} else if (code <= 0x03FFFFFF) {
value[destIndex++] = ((code >> 24) & 0x03) | 0xF0;
value[destIndex++] = ((code >> 18) & 0x3F) | 0x80;
value[destIndex++] = ((code >> 12) & 0x3F) | 0x80;
value[destIndex++] = ((code >> 6 ) & 0x3F) | 0x80;
value[destIndex++] = ((code >> 0 ) & 0x3F) | 0x80;
} else if (code <= 0x7FFFFFFF) {
value[destIndex++] = ((code >> 30) & 0x01) | 0xFC;
value[destIndex++] = ((code >> 24) & 0x3F) | 0x80;
value[destIndex++] = ((code >> 18) & 0x3F) | 0x80;
value[destIndex++] = ((code >> 12) & 0x3F) | 0x80;
value[destIndex++] = ((code >> 6 ) & 0x3F) | 0x80;
value[destIndex++] = ((code >> 0 ) & 0x3F) | 0x80;
} else {
throw new Error("Unsupported Unicode character \""
+ str.charAt(index) + "\" with code " + code + " (binary: "
+ toBinary(code) + ") at index " + index
+ ". Cannot represent it as UTF-8 byte sequence.");
}
}
return value;
}
You could try the following
select case when mydatetime IS NULL THEN '' else convert(varchar(20),@mydatetime,120) end as converted_date from sometable
-- Testing it out could do --
declare @mydatetime datetime
set @mydatetime = GETDATE() -- comment out for null value
--set @mydatetime = GETDATE()
select
case when @mydatetime IS NULL THEN ''
else convert(varchar(20),@mydatetime,120)
end as converted_date
Hope this helps!
Right click in the query pane, select Query Options...
and in the Execution->General section (the default when you first open it) there is an Execution time-out
setting.
This should have been a comment, but it wasn't fitting in a comment length, so I posted it as an answer.
All the benefits mentioned in other answers are achievable by simpler means than using maven. If, for-example, you are new to a project, you'll anyway spend more time creating project architecture, joining components, coding than downloading jars and copying them to lib folder. If you are experienced in your domain, then you already know how to start off the project with what libraries. I don't see any benefit of using maven, especially when it poses a lot of problems while automatically doing the "dependency management".
I only have intermediate level knowledge of maven, but I tell you, I have done large projects(like ERPs) without using maven.
This obviously is deficiency of the API design. In the first place, Activity Context and Application context are totally different objects, so the method parameters where context is used should use ApplicationContext
or Activity
directly, instead of using parent class Context.
In the second place, the doc should specify which context to use or not explicitly.
<object CLASSID="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B" width="320" height="256" CODEBASE="http://www.apple.com/qtactivex/qtplugin.cab">
<param name="src" value="sample.mov">
<param name="qtsrc" value="rtsp://realmedia.uic.edu/itl/ecampb5/demo_broad.mov">
<param name="autoplay" value="true">
<param name="loop" value="false">
<param name="controller" value="true">
<embed src="sample.mov" qtsrc="rtsp://realmedia.uic.edu/itl/ecampb5/demo_broad.mov" width="320" height="256" autoplay="true" loop="false" controller="true" pluginspage="http://www.apple.com/quicktime/"></embed>
</object>
source is the first search result of the Google
The SPE IDE has built-in UML creator. Just open the files in SPE and click on the UML tab.
I don't know how comprhensive it is for your needs, but it doesn't require any additional downloads or configurations to use.
Modern answer: Use LocalDate
from java.time
, the modern Java date and time API, and its toString
method:
LocalDate date = LocalDate.of(2012, Month.DECEMBER, 1); // get from somewhere
String formattedDate = date.toString();
System.out.println(formattedDate);
This prints
2012-12-01
A date (whether we’re talking java.util.Date
or java.time.LocalDate
) doesn’t have a format in it. All it’s got is a toString
method that produces some format, and you cannot change the toString
method. Fortunately, LocalDate.toString
produces exactly the format you asked for.
The Date
class is long outdated, and the SimpleDateFormat
class that you tried to use, is notoriously troublesome. I recommend you forget about those classes and use java.time
instead. The modern API is so much nicer to work with.
Except: it happens that you get a Date
from a legacy API that you cannot change or don’t want to change just now. The best thing you can do with it is convert it to java.time.Instant
and do any further operations from there:
Date oldfashoinedDate = // get from somewhere
LocalDate date = oldfashoinedDate.toInstant()
.atZone(ZoneId.of("Asia/Beirut"))
.toLocalDate();
Please substitute your desired time zone if it didn’t happen to be Asia/Beirut. Then proceed as above.
Link: Oracle tutorial: Date Time, explaining how to use java.time
.
I had a simular problem. I wanted the user to be able to filter "Table3" in a protected worksheet. But the user is not able to edit the table. I accomplished above, using the vba code below:
Range("Table3").Select
Selection.Locked = True
Selection.FormulaHidden = False
ActiveSheet.Protect DrawingObjects:=True, Contents:=True, Scenarios:=True _
, allowfiltering:=True
In the following code I filtered the code using VBA:
Range("Table3[[#Headers],[Aantal4]]").Select
ActiveSheet.ListObjects("Table3").Range.AutoFilter Field:=8, Criteria1:= _
Array("1", "12", "2", "24", "4", "6"), Operator:=xlFilterValues
You just compile it. In the bin\Release (or bin\Debug) folder, the .exe will be in there.
If you're asking how to make an executable which does not rely on the .NET framework at all, then that's a lot harder and you'll need to purchase something like RemoteSoft's Salamader. In general, it's not really worth the bother: Windows Vista comes with .NET framework 2.0 pre-installed already so if you're worried about that, you can just target the 2.0 framework (then only XP users would have to install the framework).
In Linux command Prompt, I would first stop all postgresql processes that are running by tying this command sudo /etc/init.d/postgresql restart
type the command bg to check if other postgresql processes are still running
then followed by dropdb dbname to drop the database
sudo /etc/init.d/postgresql restart
bg
dropdb dbname
This works for me on linux command prompt
In SQL Server, using a prepared statement is definitely injection-proof because the input parameters don't form the query. It means that the executed query is not a dynamic query. Example of an SQL injection vulnerable statement.
string sqlquery = "select * from table where username='" + inputusername +"' and password='" + pass + "'";
Now if the value in the inoutusername variable is something like a' or 1=1 --, this query now becomes:
select * from table where username='a' or 1=1 -- and password=asda
And the rest is commented after --
, so it never gets executed and bypassed as using the prepared statement example as below.
Sqlcommand command = new sqlcommand("select * from table where username = @userinput and password=@pass");
command.Parameters.Add(new SqlParameter("@userinput", 100));
command.Parameters.Add(new SqlParameter("@pass", 100));
command.prepare();
So in effect you cannot send another parameter in, thus avoiding SQL injection...
Adding to cchana's answer. The method "length-6" fails on non-latin values in enum.
For example (the values are in Cyrillic, table is UTF8 - utf8_general_ci. In the examples I use the variable for simplicity: selecting from schema gives the same):
set @a:="enum('? ??????','?? ????????','???????')";
select substring(@a,6,length(@a)-6);
+-------------------------------------------------------------+
| substring(@a,6,length(@a)-6) |
+-------------------------------------------------------------+
| '? ??????','?? ????????','???????') |
+-------------------------------------------------------------+
Note the closing parenthesis?
select right(@a,1);
+-------------+
| right(@a,1) |
+-------------+
| ) |
+-------------+
Well, let's try remove one more character:
select substring(@a,6,length(@a)-7);
+-------------------------------------------------------------+
| substring(@a,6,length(@a)-7) |
+-------------------------------------------------------------+
| '? ??????','?? ????????','???????') |
+-------------------------------------------------------------+
No luck! The parenthesis stays in place.
Checking (mid()
function works in way similar to substring()
, and both shows the same results):
select mid(@a,6,length(@a)/2);
+---------------------------------------------------------+
| mid(@a,6,length(@a)/2) |
+---------------------------------------------------------+
| '? ??????','?? ????????','?????? |
+---------------------------------------------------------+
See: the string lost only three rightmost characters. But should we replace Cyrillic with Latin, and all works just perfectly:
set @b:="enum('in use','for removal','trashed')";
select (substring(@b,6,length(@b)-6));
+----------------------------------+
| (substring(@b,6,length(@b)-6)) |
+----------------------------------+
| 'in use','for removal','trashed' |
+----------------------------------+
JFYI
Edit 20210221: the solution for non-Latin characters is CHAR_LENGTH()
instead of "simple" LENGTH()
Check if Tensorflow was installed successfully using:
pip3 show tensorflow
If you get something like
Name: tensorflow
Version: 1.2.1
Summary: TensorFlow helps the tensors flow
Home-page: http://tensorflow.org/
Author: Google Inc.
Author-email: [email protected]
License: Apache 2.0
Location: /usr/local/lib/python3.5/dist-packages
Requires: bleach, markdown, html5lib, backports.weakref, werkzeug, numpy, protobuf, wheel, six
You may try adding the path of your tensorflow location by:
export PYTHONPATH=/your/tensorflow/path:$PYTHONPATH.
The keypress event from jQuery is meant to do this sort of work. You can trigger the event by passing a string "keypress" to .trigger(). However to be more specific you can actually pass a jQuery.Event object (specify the type as "keypress") as well and provide any properties you want such as the keycode being the spacebar.
http://docs.jquery.com/Events/trigger#eventdata
Read the above documentation for more details.
Android has build-in Java API. Check out java.util.zip package.
The class ZipInputStream is what you should look into. Read ZipEntry from the ZipInputStream and dump it into filesystem/folder. Check similar example to compress into zip file.
Try an HTML table or use the following CSS :
<div id="bloc1" style="float:left">...</div>
<div id="bloc2">...</div>
(or use an HTML table)
For clarification, here is a more detailed example demonstrating Form Validation using jQuery Validation Unobtrusive.
Both use the following JavaScript with jQuery:
$("#commentForm").validate({
submitHandler: function(form) {
// some other code
// maybe disabling submit button
// then:
alert("This is a valid form!");
// form.submit();
}
});
The main differences between the two plugins are the attributes used for each approach.
jQuery Validation
Simply use the following attributes:
Here's the form...
<form id="commentForm">
<label for="form-name">Name (required, at least 2 characters)</label>
<input id="form-name" type="text" name="form-name" class="form-control" minlength="2" required>
<input type="submit" value="Submit">
</form>
jQuery Validation Unobtrusive
The following data attributes are needed:
Here's the form...
<form id="commentForm">
<label for="form-x-name">Name (required, at least 2 characters)</label>
<input id="form-x-name" type="text" name="name" minlength="2" class="form-control" data-msg-required="Name is required." data-rule-required="true">
<input type="submit" value="Submit">
</form>
Based on either of these examples, if the form fields that are required have been filled, and they meet the additional attribute criteria, then a message will pop up notifying that all form fields are validated. Otherwise, there will be text near the offending form fields that indicates the error.
References: - jQuery Validation: https://jqueryvalidation.org/documentation/
Typically by setting a default value for a parameter:
int func(int a, int b = -1) {
std::cout << "a = " << a;
if (b != -1)
std::cout << ", b = " << b;
std::cout << "\n";
}
int main() {
func(1, 2); // prints "a=1, b=2\n"
func(3); // prints "a=3\n"
return 0;
}
I was having the same issue as the OP except that all these suggestions did not work. I found a solution for me.
Make sure that "Skip packaging and dexing until export or launch." is selected.
Go to Window -> Preferences -> Android -> Build. Just make sure that option is selected and apply.
I know this does not make a lot of sense, but having it unselected was giving me this error and with it selected it goes away and the apk is installed.
I am using the auto generated ant build script from android and ONLY using it as my build process in eclipse. I am not using any other build methods.
Unfortunately, the string.encode() method is not always reliable. Check out this thread for more information: What is the fool proof way to convert some string (utf-8 or else) to a simple ASCII string in python
Component 2, the directive component can define a input property (@input
annotation in Typescript). And Component 1 can pass that property to the directive component from template.
See this SO answer How to do inter communication between a master and detail component in Angular2?
and how input is being passed to child components. In your case it is directive.
Correct way to check for null or empty or string containing only spaces is like this:
if(str != null && !str.trim().isEmpty()) { /* do your stuffs here */ }
If you are here seeking a solution to get all branches and then migrate everything to another Git server, I put together the below process. If you just want to get all the branches updated locally, stop at the first empty line.
git clone <ORIGINAL_ORIGIN>
git branch -r | awk -F'origin/' '!/HEAD|master/{print $2 " " $1"origin/"$2}' | xargs -L 1 git branch -f --track
git fetch --all --prune --tags
git pull --all
git remote set-url origin <NEW_ORIGIN>
git pull
<resolve_any_merge_conflicts>
git push --all
git push --tags
<check_NEW_ORIGIN_to_ensure_it_matches_ORIGINAL_ORIGIN>
EDIT : It is not bleeding edge anymore : http://blog.docker.com/2016/02/docker-1-10/
Original Answer
I battled with it the whole night.
If you're not afraid of bleeding edge, the latest version of Docker engine and Docker compose both implement libnetwork.
With the right config file (that need to be put in version 2), you will create services that will all see each other. And, bonus, you can scale them with docker-compose as well (you can scale any service you want that doesn't bind port on the host)
Here is an example file
version: "2"
services:
router:
build: services/router/
ports:
- "8080:8080"
auth:
build: services/auth/
todo:
build: services/todo/
data:
build: services/data/
And the reference for this new version of compose file: https://github.com/docker/compose/blob/1.6.0-rc1/docs/networking.md
When you create an new web application using visual studio.net, it automatically creates the virtual directory and configures it as an application. However, if you manually create the virtual directory and it is not configured as an application, then you will not be able to browse the application and may get the above error.
A PIL only solution for creating a bi-level (black and white) image with a custom threshold:
from PIL import Image
img = Image.open('mB96s.png')
thresh = 200
fn = lambda x : 255 if x > thresh else 0
r = img.convert('L').point(fn, mode='1')
r.save('foo.png')
With just
r = img.convert('1')
r.save('foo.png')
you get a dithered image.
From left to right the input image, the black and white conversion result and the dithered result:
You can click on the images to view the unscaled versions.
The error is self-explanatory... doInBackground()
runs on a background thread which, since it is not intended to loop, is not connected to a Looper
.
You most likely don't want to directly instantiate a Handler at all... whatever data your doInBackground()
implementation returns will be passed to onPostExecute()
which runs on the UI thread.
mActivity = ThisActivity.this;
mActivity.runOnUiThread(new Runnable() {
public void run() {
new asyncCreateText().execute();
}
});
ADDED FOLLOWING THE STACKTRACE APPEARING IN QUESTION:
Looks like you're trying to start an AsyncTask
from a GL rendering thread... don't do that cos they won't ever Looper.loop()
either. AsyncTasks are really designed to be run from the UI thread only.
The least disruptive fix would probably be to call Activity.runOnUiThread()
with a Runnable
that kicks off your AsyncTask
.
I have two solutions for this Question.
- The first solution is on getting display names from enum.
public enum CourseLocationTypes
{
[Display(Name = "On Campus")]
OnCampus,
[Display(Name = "Online")]
Online,
[Display(Name = "Both")]
Both
}
public static string DisplayName(this Enum value)
{
Type enumType = value.GetType();
string enumValue = Enum.GetName(enumType, value);
MemberInfo member = enumType.GetMember(enumValue)[0];
object[] attrs = member.GetCustomAttributes(typeof(DisplayAttribute), false);
string outString = ((DisplayAttribute)attrs[0]).Name;
if (((DisplayAttribute)attrs[0]).ResourceType != null)
{
outString = ((DisplayAttribute)attrs[0]).GetName();
}
return outString;
}
<h3 class="product-title white">@Model.CourseLocationType.DisplayName()</h3>
- The second Solution is on getting display name from enum name but that will be enum split in developer language it's called patch.
public static string SplitOnCapitals(this string text)
{
var r = new Regex(@"
(?<=[A-Z])(?=[A-Z][a-z]) |
(?<=[^A-Z])(?=[A-Z]) |
(?<=[A-Za-z])(?=[^A-Za-z])", RegexOptions.IgnorePatternWhitespace);
return r.Replace(text, " ");
}
<div class="widget-box pt-0">
@foreach (var item in Enum.GetNames(typeof(CourseLocationType)))
{
<label class="pr-2 pt-1">
@Html.RadioButtonFor(x => x.CourseLocationType, item, new { type = "radio", @class = "iCheckBox control-label" }) @item.SplitOnCapitals()
</label>
}
@Html.ValidationMessageFor(x => x.CourseLocationType)
</div>
Give the div a fixed height and srcoll:hidden; and on hover change the scroll to auto;
#test_scroll{ height:300px; overflow:hidden;}
#test_scroll:hover{overflow-y:auto;}
Here is an example. http://jsfiddle.net/Lywpk/
In Visual Studio, go to the Tools menu, select Options, expand Source Control, (In a TFS environment, click Visual Studio Team Foundation Server), and click on the Configure User Tools button.
Click the Add button.
Enter/select the following options for Compare:
.*
Compare
C:\Program Files\Beyond Compare 3\BComp.exe
(replace with the proper path for your machine, including version number)%1 %2 /title1=%6 /title2=%7
If using Beyond Compare Professional (3-way Merge):
.*
Merge
C:\Program Files\Beyond Compare 3\BComp.exe
(replace with the proper path for your machine, including version number)%1 %2 %3 %4 /title1=%6 /title2=%7 /title3=%8 /title4=%9
If using Beyond Compare v3/v4 Standard or Beyond Compare v2 (2-way Merge):
.*
Merge
C:\Program Files\Beyond Compare 3\BComp.exe
(replace with the proper path for your machine, including version number)%1 %2 /savetarget=%4 /title1=%6 /title2=%7
If you use tabs in Beyond Compare
If you run Beyond Compare in tabbed mode, it can get confused when you diff or merge more than one set of files at a time from Visual Studio. To fix this, you can add the argument /solo
to the end of the arguments; this ensures each comparison opens in a new window, working around the issue with tabs.
ping -n 11 -w 1000 127.0.0.1 > nul
Update
Beginner's mistake. Ping doesn't wait 1000 ms before or after an request, but inbetween requests. So to wait 10 seconds, you'll have to do 11 pings to have 10 'gaps' of a second inbetween.
How to open two instances of the same file side by side in Visual Studio 2019:
Open the file.
Click Window -> New Window
.
A new window should be open with the same file.
Click on Window -> New Vertical Document Group
.
I would do something like this
DEMO in JsBin: http://jsbin.com/ofiqur/1/
<a href="#" id="showmenu">Click Here</a>
<div class="menu">
<ul>
<li><a href="#">Button 1</a></li>
<li><a href="#">Button 2</a></li>
<li><a href="#">Button 3</a></li>
</ul>
</div>
and in jQuery as simple as
var min = "-100px", // remember to set in css the same value
max = "0px";
$(function() {
$("#showmenu").click(function() {
if($(".menu").css("marginLeft") == min) // is it left?
$(".menu").animate({ marginLeft: max }); // move right
else
$(".menu").animate({ marginLeft: min }); // move left
});
});
Use CASE
:
SELECT
TABEL1.Id,
CASE WHEN EXISTS (SELECT Id FROM TABLE2 WHERE TABLE2.ID = TABLE1.ID)
THEN 'TRUE'
ELSE 'FALSE'
END AS NewFiled
FROM TABLE1
If TABLE2.ID
is Unique or a Primary Key, you could also use this:
SELECT
TABEL1.Id,
CASE WHEN TABLE2.ID IS NOT NULL
THEN 'TRUE'
ELSE 'FALSE'
END AS NewFiled
FROM TABLE1
LEFT JOIN Table2
ON TABLE2.ID = TABLE1.ID
On Ubuntu, for versions of Sublime older than 3.2, what worked for me was changing the dpi scale in Preferences > Settings — User by adding this line:
"dpi_scale": 1.10
For Sublime 3.2, you can use the following line instead:
"ui_scale": 1.10
Adjust the scale value as needed. After this change, you have to restart Sublime Text for it to take effect.
Actually in C, you don't have an power operator. You will need to manually run a loop to get the result. Even the exp function just operates in that way only. But if you need to use that function, include the following header
#include <math.h>
then you can use pow().
I'm not able to understand the flow of execution of the program, And when ob1 is created then the constructor is called where t.start() is written but still run() method is not executed rather main() method continues execution. So why is this happening?
This depends on Thread Scheduler as main shares the same priority order. Calling start() doesn't mean run() will be called immediately, it depends on thread scheduler when it chooses to run your thread.
join() method is used to wait until the thread on which it is called does not terminates, but here in output we see alternate outputs of the thread why??
This is because of the Thread.sleep(1000) in your code. Remove that line and you will see ob1 finishes before ob2 which in turn finishes before ob3 (as expected with join()). Having said that it all depends on when ob1 ob2 and ob3 started. Calling sleep will pause thread execution for >= 1 second (in your code), giving scheduler a chance to call other threads waiting (same priority).
Implicit garbage collection could have been added in, but it just didn't make the cut. Probably due to not just implementation complications, but also due to people not being able to come to a general consensus fast enough.
A quote from Bjarne Stroustrup himself:
I had hoped that a garbage collector which could be optionally enabled would be part of C++0x, but there were enough technical problems that I have to make do with just a detailed specification of how such a collector integrates with the rest of the language, if provided. As is the case with essentially all C++0x features, an experimental implementation exists.
There is a good discussion of the topic here.
General overview:
C++ is very powerful and allows you to do almost anything. For this reason it doesn't automatically push many things onto you that might impact performance. Garbage collection can be easily implemented with smart pointers (objects that wrap pointers with a reference count, which auto delete themselves when the reference count reaches 0).
C++ was built with competitors in mind that did not have garbage collection. Efficiency was the main concern that C++ had to fend off criticism from in comparison to C and others.
There are 2 types of garbage collection...
Explicit garbage collection:
C++0x will have garbage collection via pointers created with shared_ptr
If you want it you can use it, if you don't want it you aren't forced into using it.
You can currently use boost:shared_ptr as well if you don't want to wait for C++0x.
Implicit garbage collection:
It does not have transparent garbage collection though. It will be a focus point for future C++ specs though.
Why Tr1 doesn't have implicit garbage collection?
There are a lot of things that tr1 of C++0x should have had, Bjarne Stroustrup in previous interviews stated that tr1 didn't have as much as he would have liked.
Try this:
par(adj = 0)
plot(1, 1, main = "Title")
or equivalent:
plot(1, 1, main = "Title", adj = 0)
adj = 0
produces left-justified text, 0.5 (the default) centered text and 1 right-justified text. Any value in [0, 1]
is allowed.
However, the issue is that this will also change the position of the label of the x-axis and y-axis.
I think there is a really good MSDN blog post about this topic by Laurentiu Cristofor:
The first important thing that needs to be understood about SQL Server security is that there are two security realms involved - the server and the database. The server realm encompasses multiple database realms. All work is done in the context of some database, but to get to do the work, one needs to first have access to the server and then to have access to the database.
Access to the server is granted via logins. There are two main categories of logins: SQL Server authenticated logins and Windows authenticated logins. I will usually refer to these using the shorter names of SQL logins and Windows logins. Windows authenticated logins can either be logins mapped to Windows users or logins mapped to Windows groups. So, to be able to connect to the server, one must have access via one of these types or logins - logins provide access to the server realm.
But logins are not enough, because work is usually done in a database and databases are separate realms. Access to databases is granted via users.
Users are mapped to logins and the mapping is expressed by the SID property of logins and users. A login maps to a user in a database if their SID values are identical. Depending on the type of login, we can therefore have a categorization of users that mimics the above categorization for logins; so, we have SQL users and Windows users and the latter category consists of users mapped to Windows user logins and of users mapped to Windows group logins.
Let's take a step back for a quick overview: a login provides access to the server and to further get access to a database, a user mapped to the login must exist in the database.
that's the link to the full post.
In addition to doing the following, you may experience this issue if your app's Storyboard's files are localized. First, do each of these:
DerivedData
folder in ~/Library/Developer/Xcode/DerivedDataWhat finally worked for me was re-generating the storyboard localization files and deleting the English localization (which was unneeded because the Base Locale is English). To reload your Storyboard strings, see this answer on StackOverflow.
I had noticed that the non-text parts of my Storyboard were being updated, but not the localized text. If you have a localization in your app, I would recommend checking to make sure your localizations are updated (even if they're .strings
files).
The above mentioned solutions didn't work for me.
I just restarted my IDE by closing it and reopening it.
And then error disappeared and its working fine now.
You can do this simply with SSMS. Just go to your table name and expand the Triggers node to view a list of triggers associated with that table. Right click to modify your trigger.
I have passed this problem in VS2012. When I can't find "Browse with.." on the right-click of the project, I found it on File Menu -> Browse with. If it doesn't appear, first you have to click on menu bar, then try open file menu again. If it still doesn't appear, you can just go to Quick Launch on the top right of menu bar then type it "Browse with".
You could just use the imageView's image cache. It will render the entire view as it is layed out (scaled,bordered with a background etc) to a new bitmap.
just make sure it built.
imageView.buildDrawingCache();
Bitmap bmap = imageView.getDrawingCache();
there's your bitmap as the screen saw it.
All you need to do is set the PATH environment variable in Windows to point to where your java6 bin directory is instead of the java7 directory.
Right click My Computer > Advanced System Settings > Advanced > Environmental Variables
If there is a JAVA_HOME environment variable set this to point to the correct directory as well.
One can also use std::valarray<T>
like this
#include<iostream>
#include<vector>
#include<valarray>
int main()
{
std::vector<int> seq{ 1,2,3,4,5,6,7,8,9,10 };
std::valarray<int> seq_add{ seq.data(), seq.size() };
std::cout << "sum = " << seq_add.sum() << "\n";
return 0;
}
Some may not find this way efficient since the size of valarray
needs to be as big as the size of the vector and initializing valarray
will also take time.
In that case, don't use it and take it as yet another way of summing up the sequence.
Put the tab name on the page header or group TableRow1 in your report so that it will appear in the "A1" position on each Excel sheet. Then run this macro in your Excel workbook.
Sub SelectSheet()
For i = 1 To ThisWorkbook.Sheets.Count
mysheet = "Sheet" & i
On Error GoTo 10
Sheets(mysheet).Select
Set Target = Range("A1")
If Target = "" Then Exit Sub
On Error GoTo Badname
ActiveSheet.Name = Left(Target, 31)
GoTo 10
Badname:
MsgBox "Please revise the entry in A1." & Chr(13) _
& "It appears to contain one or more " & Chr(13) _
& "illegal characters." & Chr(13)
Range("A1").Activate
10
Next i
End Sub
Latest OSX (10.8) and mysql 5.6, the file is under Launch Daemons and is com.oracle.oss.mysql.mysqld.plist. It presents an option under System Options, usually the bottom of the list. So go to system settings, click on Mysql, and turn it off from the option box. https://dev.mysql.com/doc/refman/5.6/en/osx-installation-launchd.html
The return statement only makes sense inside functions:
def foo():
while True:
return False
After following all the steps mentioned here, if it still does not connect, try adding the DNS with the IP address in the hosts file in the etc folder. Adding an IP address instead of DNS name in the connection string should be a temporary solution to check if the connection actually works.
I ran into this issue with Python 3.6
and Python 3.7
. The top answer (running pip install --upgrade pip enum34
) did not solve the problem.
I don't know why, but the reason why this error happen is because enum.py
was missing from .venv/myvenv/lib/python3.7/
.
But the file was in /usr/lib/python3.7/
.
Following this answer, I just created the symbolic link by myself :
ln -s /usr/lib/python3.7/enum.py .venv/myvenv/lib/python3.7/enum.py
Just use for True:
<li ng-if="area"></li>
and for False:
<li ng-if="area === false"></li>
You can use np.concatenate()
specifying which axis
to append, using np.newaxis
:
import numpy as np
movie = np.concatenate((img1[:,np.newaxis], img2[:,np.newaxis]), axis=3)
If you are reading from many files:
import glob
movie = np.concatenate([cv2.imread(p)[:,np.newaxis] for p in glob.glob('*.jpg')], axis=3)
Currently, the eyedropper tool is not working in my version of Chrome (as described above), though it worked for me in the past. I hear it is being updated in the latest version of Chrome.
However, I'm able to grab colors easily in Firefox.
In case you cannot get the eyedropper tool to work in Chrome, this is a good work around.
I also find it easier to access :-)
Visual Studio 2008 has some very good JavaScript debugging tools. You can drop a breakpoint in your client side JavaScript code and step through it using the exact same tools as you would the server side code. There is no need to attach to a process or do anything tricky to enable it.
SELECT DATEDIFF (
DAY,
DATEDIFF(DAY, @CreatedDate, -1),
GETDATE())
An even easier and more shorthand version would be:
if (!x) {
//Undefined
}
OR
if (typeof x !== "undefined") {
//Do something since x is defined.
}
Is there any reason for a class declaration to inherit from
object
?
In Python 3, apart from compatibility between Python 2 and 3, no reason. In Python 2, many reasons.
In Python 2.x (from 2.2 onwards) there's two styles of classes depending on the presence or absence of object
as a base-class:
"classic" style classes: they don't have object
as a base class:
>>> class ClassicSpam: # no base class
... pass
>>> ClassicSpam.__bases__
()
"new" style classes: they have, directly or indirectly (e.g inherit from a built-in type), object
as a base class:
>>> class NewSpam(object): # directly inherit from object
... pass
>>> NewSpam.__bases__
(<type 'object'>,)
>>> class IntSpam(int): # indirectly inherit from object...
... pass
>>> IntSpam.__bases__
(<type 'int'>,)
>>> IntSpam.__bases__[0].__bases__ # ... because int inherits from object
(<type 'object'>,)
Without a doubt, when writing a class you'll always want to go for new-style classes. The perks of doing so are numerous, to list some of them:
Support for descriptors. Specifically, the following constructs are made possible with descriptors:
classmethod
: A method that receives the class as an implicit argument instead of the instance.staticmethod
: A method that does not receive the implicit argument self
as a first argument.property
: Create functions for managing the getting, setting and deleting of an attribute. __slots__
: Saves memory consumptions of a class and also results in faster attribute access. Of course, it does impose limitations.The __new__
static method: lets you customize how new class instances are created.
Method resolution order (MRO): in what order the base classes of a class will be searched when trying to resolve which method to call.
Related to MRO, super
calls. Also see, super()
considered super.
If you don't inherit from object
, forget these. A more exhaustive description of the previous bullet points along with other perks of "new" style classes can be found here.
One of the downsides of new-style classes is that the class itself is more memory demanding. Unless you're creating many class objects, though, I doubt this would be an issue and it's a negative sinking in a sea of positives.
In Python 3, things are simplified. Only new-style classes exist (referred to plainly as classes) so, the only difference in adding object
is requiring you to type in 8 more characters. This:
class ClassicSpam:
pass
is completely equivalent (apart from their name :-) to this:
class NewSpam(object):
pass
and to this:
class Spam():
pass
All have object
in their __bases__
.
>>> [object in cls.__bases__ for cls in {Spam, NewSpam, ClassicSpam}]
[True, True, True]
In Python 2: always inherit from object
explicitly. Get the perks.
In Python 3: inherit from object
if you are writing code that tries to be Python agnostic, that is, it needs to work both in Python 2 and in Python 3. Otherwise don't, it really makes no difference since Python inserts it for you behind the scenes.
Please try this
error_reporting = E_ALL & ~E_NOTICE
in php.ini
Casting in Java isn't magic, it's you telling the compiler that an Object of type A is actually of more specific type B, and thus gaining access to all the methods on B that you wouldn't have had otherwise. You're not performing any kind of magic or conversion when performing casting, you're essentially telling the compiler "trust me, I know what I'm doing and I can guarantee you that this Object at this line is actually an <Insert cast type here>." For example:
Object o = "str";
String str = (String)o;
The above is fine, not magic and all well. The object being stored in o is actually a string, and therefore we can cast to a string without any problems.
There's two ways this could go wrong. Firstly, if you're casting between two types in completely different inheritance hierarchies then the compiler will know you're being silly and stop you:
String o = "str";
Integer str = (Integer)o; //Compilation fails here
Secondly, if they're in the same hierarchy but still an invalid cast then a ClassCastException
will be thrown at runtime:
Number o = new Integer(5);
Double n = (Double)o; //ClassCastException thrown here
This essentially means that you've violated the compiler's trust. You've told it you can guarantee the object is of a particular type, and it's not.
Why do you need casting? Well, to start with you only need it when going from a more general type to a more specific type. For instance, Integer
inherits from Number
, so if you want to store an Integer
as a Number
then that's ok (since all Integers are Numbers.) However, if you want to go the other way round you need a cast - not all Numbers are Integers (as well as Integer we have Double
, Float
, Byte
, Long
, etc.) And even if there's just one subclass in your project or the JDK, someone could easily create another and distribute that, so you've no guarantee even if you think it's a single, obvious choice!
Regarding use for casting, you still see the need for it in some libraries. Pre Java-5 it was used heavily in collections and various other classes, since all collections worked on adding objects and then casting the result that you got back out the collection. However, with the advent of generics much of the use for casting has gone away - it has been replaced by generics which provide a much safer alternative, without the potential for ClassCastExceptions (in fact if you use generics cleanly and it compiles with no warnings, you have a guarantee that you'll never get a ClassCastException.)
I want to add some clarification to this thread:
Update-Database -TargetMigration:"name_of_migration"
What you are doing above is saying that you want to rollback all migrations UNTIL you're left with the migration specified. Thus, if you use GET-MIGRATIONS and you find that you have A, B, C, D, and E, then using this command will rollback E and D to get you to C:
Update-Database -TargetMigration:"C"
Also, unless anyone can comment to the contrary, I noticed that you can use an ordinal value and the short -Target switch (thus, -Target is the same as -TargetMigration). If you want to rollback all migrations and start over, you can use:
Update-Database -Target:0
0, above, would rollback even the FIRST migration (this is a destructive command--be sure you know what you're doing before you use it!)--something you cannot do if you use the syntax above that requires the name of the target migration (the name of the 0th migration doesn't exist before a migration is applied!). So in that case, you have to use the 0 (ordinal) value. Likewise, if you have applied migrations A, B, C, D, and E (in that order), then the ordinal 1 should refer to A, ordinal 2 should refer to B, and so on. So to rollback to B you could use either:
Update-Database -TargetMigration:"B"
or
Update-Database -TargetMigration:2
According to this related answer on a similar question, correct command is -Target
for EF Core 1.1 while it is -Migration
for EF Core 2.0.
Boolean
wraps the boolean primitive type. In JDK 5 and upwards, Oracle (or Sun before Oracle bought them) introduced autoboxing/unboxing, which essentially allows you to do this
boolean result = Boolean.TRUE;
or
Boolean result = true;
Which essentially the compiler does,
Boolean result = Boolean.valueOf(true);
So, for your answer, it's YES.
Since the year 2015 kernel patch that adds SwapPss
(https://lore.kernel.org/patchwork/patch/570506/) one can finally get proportional swap count meaning that if a process has swapped a lot and then it forks, both forked processes will be reported to swap 50% each. And if either then forks, each process is counted 33% of the swapped pages so if you count all those swap usages together, you get real swap usage instead of value multiplied by process count.
In short:
(cd /proc; for pid in [0-9]*; do printf "%5s %6s %s\n" "$pid" "$(awk 'BEGIN{sum=0} /SwapPss:/{sum+=$2} END{print sum}' $pid/smaps)" "$(cat $pid/comm)"; done | sort -k2n,2 -k1n,1)
First column is pid, second column is swap usage in KiB and rest of the line is command being executed. Identical swap counts are sorted by pid.
Above may emit lines such as
awk: cmd. line:1: fatal: cannot open file `15407/smaps' for reading (No such file or directory)
which simply means that process with pid 15407 ended between seeing it in the list for /proc/
and reading the process smaps
file. If that matters to you, simply add 2>/dev/null
to the end. Note that you'll potentially lose any other possible diagnostics as well.
In real world example case, this changes other tools reporting ~40 MB swap usage for each apache child running on one server to actual usage of between 7-3630 KB really used per child.
A quick note: Assume.assumeTrue(condition)
ignores rest of the steps but passes the test.
To fail the test, use org.junit.Assert.fail()
inside the conditional statement. Works same like Assume.assumeTrue()
but fails the test.
you can use regex as the delimiter:
pd.read_csv("whitespace.csv", header=None, delimiter=r"\s+")
You would use a Shape Drawable as the layout's background and set its cornerRadius. Check this blog for a detailed tutorial
I dealt with the same problem but in my case it was important that the millisecond was rounded and not truncated
from datetime import datetime, timedelta
def strftime_ms(datetime_obj):
y,m,d,H,M,S = datetime_obj.timetuple()[:6]
ms = timedelta(microseconds = round(datetime_obj.microsecond/1000.0)*1000)
ms_date = datetime(y,m,d,H,M,S) + ms
return ms_date.strftime('%Y-%m-%d %H:%M:%S.%f')[:-3]
Pandas has the itertuples
method to do exactly this:
list(df[['lat', 'long']].itertuples(index=False, name=None))
if
event.currentTarget.performance.navigation.type
returns
0 => user just typed in an Url
1 => page reloaded
2 => back button clicked.
This can be done through the youtube player API:
Working example:
<div id="player"></div>
<script src="http://www.youtube.com/player_api"></script>
<script>
// create youtube player
var player;
function onYouTubePlayerAPIReady() {
player = new YT.Player('player', {
width: '640',
height: '390',
videoId: '0Bmhjf0rKe8',
events: {
onReady: onPlayerReady,
onStateChange: onPlayerStateChange
}
});
}
// autoplay video
function onPlayerReady(event) {
event.target.playVideo();
}
// when video ends
function onPlayerStateChange(event) {
if(event.data === 0) {
alert('done');
}
}
</script>
You say that the matrices are the same dimensions, and yet you are trying to perform matrix multiplication on them. Multiplication of matrices with the same dimension is only possible if they are square. In your case, you get an assertion error, because the dimensions are not square. You have to be careful when multiplying matrices, as there are two possible meanings of multiply.
Matrix multiplication is where two matrices are multiplied directly. This operation multiplies matrix A of size [a x b] with matrix B of size [b x c] to produce matrix C of size [a x c]. In OpenCV it is achieved using the simple *
operator:
C = A * B
Element-wise multiplication is where each pixel in the output matrix is formed by multiplying that pixel in matrix A by its corresponding entry in matrix B. The input matrices should be the same size, and the output will be the same size as well. This is achieved using the mul()
function:
output = A.mul(B);
0
Right click "drawable" Click on "New", then "Image Asset" Change "Icon Type" to "Action Bar and Tab Icons" Change "Asset Type" to "Clip Art" for icon & "Image" for images For Icon: Click on "Clip Art" icon button & choose your icon For Image: Click on "Path" folder icon & choose your image For "Name" type in your icon / image file name
As of v2, you can simply specify an array of values to correspond to a color for each bar via the backgroundColor
property:
datasets: [{
label: "My First dataset",
data: [20, 59, 80, 81, 56, 55, 40],
backgroundColor: ["red", "blue", "green", "blue", "red", "blue"],
}],
This is also possible for the borderColor
, hoverBackgroundColor
, hoverBorderColor
.
From the documentation on the Bar Chart Dataset Properties:
Some properties can be specified as an array. If these are set to an array value, the first value applies to the first bar, the second value to the second bar, and so on.
One more related question, since it took me forever to find the answer:
How to make the legend background blank (i.e. transparent, not white):
legend = plt.legend()
legend.get_frame().set_facecolor('none')
Warning, you want 'none'
(the string). None
means the default color instead.
Use read
with a heredoc as shown below:
read -d '' sql << EOF
select c1, c2 from foo
where c1='something'
EOF
echo "$sql"
You can do this. It looks more wordy than a tuple, but it's a big improvement because you get type checking.
Edit: Replaced snippet with complete working example, following Nick's suggestion. Playground link: http://play.golang.org/p/RNx_otTFpk
package main
import "fmt"
func main() {
queue := make(chan struct {string; int})
go sendPair(queue)
pair := <-queue
fmt.Println(pair.string, pair.int)
}
func sendPair(queue chan struct {string; int}) {
queue <- struct {string; int}{"http:...", 3}
}
Anonymous structs and fields are fine for quick and dirty solutions like this. For all but the simplest cases though, you'd do better to define a named struct just like you did.
You need to put the font files in assets folder (may be a fonts sub-folder within assets) and refer to it in the styles:
@font-face {
font-family: lato;
src: url(assets/font/Lato.otf) format("opentype");
}
Once done, you can apply this font any where like:
* {
box-sizing: border-box;
margin: 0;
padding: 0;
font-family: 'lato', 'arial', sans-serif;
}
You can put the @font-face
definition in your global styles.css
or styles.scss
and you would be able to refer to the font anywhere - even in your component specific CSS/SCSS. styles.css
or styles.scss
is already defined in angular-cli.json
. Or, if you want you can create a separate CSS/SCSS file and declare it in angular-cli.json along with the styles.css
or styles.scss
like:
"styles": [
"styles.css",
"fonts.css"
],
Even though this is old and answered, i´d like to share the solution i made out of it 2020
it comes with the flexibility to run at anytime and run a callback if greater and or smaller the specified mbps
you can start the test anywhere after you included the testConnectionSpeed Object by running the testConnectionSpeed.run(mbps, morefunction, lessfunction)
for example:
var testConnectionSpeed = {
imageAddr : "https://upload.wikimedia.org/wikipedia/commons/a/a6/Brandenburger_Tor_abends.jpg", // this is just an example, you rather want an image hosted on your server
downloadSize : 2707459, // this must match with the image above
run:function(mbps_max,cb_gt,cb_lt){
testConnectionSpeed.mbps_max = parseFloat(mbps_max) ? parseFloat(mbps_max) : 0;
testConnectionSpeed.cb_gt = cb_gt;
testConnectionSpeed.cb_lt = cb_lt;
testConnectionSpeed.InitiateSpeedDetection();
},
InitiateSpeedDetection: function() {
window.setTimeout(testConnectionSpeed.MeasureConnectionSpeed, 1);
},
result:function(){
var duration = (endTime - startTime) / 1000;
var bitsLoaded = testConnectionSpeed.downloadSize * 8;
var speedBps = (bitsLoaded / duration).toFixed(2);
var speedKbps = (speedBps / 1024).toFixed(2);
var speedMbps = (speedKbps / 1024).toFixed(2);
if(speedMbps >= (testConnectionSpeed.max_mbps ? testConnectionSpeed.max_mbps : 1) ){
testConnectionSpeed.cb_gt ? testConnectionSpeed.cb_gt(speedMbps) : false;
}else {
testConnectionSpeed.cb_lt ? testConnectionSpeed.cb_lt(speedMbps) : false;
}
},
MeasureConnectionSpeed:function() {
var download = new Image();
download.onload = function () {
endTime = (new Date()).getTime();
testConnectionSpeed.result();
}
startTime = (new Date()).getTime();
var cacheBuster = "?nnn=" + startTime;
download.src = testConnectionSpeed.imageAddr + cacheBuster;
}
}
// start test immediatly, you could also call this on any event or whenever you want
testConnectionSpeed.run(1.5, function(mbps){console.log(">= 1.5Mbps ("+mbps+"Mbps)")}, function(mbps){console.log("< 1.5Mbps("+mbps+"Mbps)")} )
_x000D_
I used this successfuly to load lowres media for slow internet connections. You have to play around a bit because on the one hand, the larger the image, the more reasonable the test, on the other hand the test will take way much longer for slow connection and in my case I especially did not want slow connection users to load lots of MBs.
CSRF protection
TYPES OF CSRF USAGE
IN FORM
<form>
@csrf
</form>
or
<input type="hidden" name="token" value="{{ form_token() }}" />
META TAG
<meta name="csrf-token" content="{{ csrf_token() }}">
AJAX
$.ajaxSetup({
headers: {
'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
}
});
SESSION
use Illuminate\Http\Request;
Route::get('/token', function (Request $request) {
$token = $request->session()->token();
$token = csrf_token();
// ...
});
MIDDLEWARE
App\Providers\RouteServiceProvider
<?php
namespace App\Http\Middleware;
use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken as Middleware;
class VerifyCsrfToken extends Middleware
{
/**
* The URIs that should be excluded from CSRF verification.
*
* @var array
*/
protected $except = [
'stripe/*',
'http://example.com/foo/bar',
'http://example.com/foo/*',
];
}
Solution from proxy side, I faced some problems in the SSL handshake process and I had to force my proxy server to send requests using HTTP/1.0 to solve the problem by setting this argument in the httpd.conf SetEnv force-proxy-request-1.0 1
SetEnv proxy-nokeepalive 1
after that I faced the 417 error as my clients application was using HTTP/1.1 and the proxy was forced to use HTTP/1.0, the problem was solved by setting this parameter in the httpd.conf on the proxy side RequestHeader unset Expect early
without the need to change anything in the client side, hope this helps.
I would've saved time if I found Resteasy Jackson Provider sooner.
Just add the Resteasy Jackson Provider JAR. No entity wrappers. No XML annotations. No custom message body writers.
var contentString = "Location: " + results[1].formatted_address;
google.maps.event.addListener(marker,'click', (function(){
infowindow.close();
infowindow = new google.maps.InfoWindow({
content: contentString
});
infowindow.open(map, marker);
}));
Just to reload everything , use window.location.reload(); with angularjs
Check out working example
HTML
<div ng-controller="MyCtrl">
<button ng-click="reloadPage();">Reset</button>
</div>
angularJS
var myApp = angular.module('myApp',[]);
function MyCtrl($scope) {
$scope.reloadPage = function(){window.location.reload();}
}
In some extent, You CAN trigger
HTML5 form validation and show hints to user without submitting the form!
Two button, one for validate, one for submit
Set a onclick
listener on the validate button to set a global flag(say justValidate
) to indicate this click is intended to check the validation of the form.
And set a onclick
listener on the submit button to set the justValidate
flag to false.
Then in the onsubmit
handler of the form, you check the flag justValidate
to decide the returning value and invoke the preventDefault()
to stop the form to submit. As you know, the HTML5 form validation(and the GUI hint to user) is preformed before the onsubmit
event, and even if the form is VALID you can stop the form submit by returning false or invoke preventDefault()
.
And, in HTML5 you have a method to check the form's validation: the form.checkValidity()
, then in you can know if the form is validate or not in your code.
OK, here is the demo: http://jsbin.com/buvuku/2/edit
According to the documentation, there are three kinds of lists that can be used with an AlertDialog
:
I will give an example of each below.
The way to make a traditional single-choice list is to use setItems
.
Java version
// setup the alert builder
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("Choose an animal");
// add a list
String[] animals = {"horse", "cow", "camel", "sheep", "goat"};
builder.setItems(animals, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case 0: // horse
case 1: // cow
case 2: // camel
case 3: // sheep
case 4: // goat
}
}
});
// create and show the alert dialog
AlertDialog dialog = builder.create();
dialog.show();
There is no need for an OK button because as soon as the user clicks on a list item control is returned to the OnClickListener
.
Kotlin version
// setup the alert builder
val builder = AlertDialog.Builder(context)
builder.setTitle("Choose an animal")
// add a list
val animals = arrayOf("horse", "cow", "camel", "sheep", "goat")
builder.setItems(animals) { dialog, which ->
when (which) {
0 -> { /* horse */ }
1 -> { /* cow */ }
2 -> { /* camel */ }
3 -> { /* sheep */ }
4 -> { /* goat */ }
}
}
// create and show the alert dialog
val dialog = builder.create()
dialog.show()
The advantage of the radio button list over the traditional list is that the user can see what the current setting is. The way to make a radio button list is to use setSingleChoiceItems
.
Java version
// setup the alert builder
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("Choose an animal");
// add a radio button list
String[] animals = {"horse", "cow", "camel", "sheep", "goat"};
int checkedItem = 1; // cow
builder.setSingleChoiceItems(animals, checkedItem, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// user checked an item
}
});
// add OK and Cancel buttons
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// user clicked OK
}
});
builder.setNegativeButton("Cancel", null);
// create and show the alert dialog
AlertDialog dialog = builder.create();
dialog.show();
I hard coded the chosen item here, but you could keep track of it with a class member variable in a real project.
Kotlin version
// setup the alert builder
val builder = AlertDialog.Builder(context)
builder.setTitle("Choose an animal")
// add a radio button list
val animals = arrayOf("horse", "cow", "camel", "sheep", "goat")
val checkedItem = 1 // cow
builder.setSingleChoiceItems(animals, checkedItem) { dialog, which ->
// user checked an item
}
// add OK and Cancel buttons
builder.setPositiveButton("OK") { dialog, which ->
// user clicked OK
}
builder.setNegativeButton("Cancel", null)
// create and show the alert dialog
val dialog = builder.create()
dialog.show()
The way to make a checkbox list is to use setMultiChoiceItems
.
Java version
// setup the alert builder
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("Choose some animals");
// add a checkbox list
String[] animals = {"horse", "cow", "camel", "sheep", "goat"};
boolean[] checkedItems = {true, false, false, true, false};
builder.setMultiChoiceItems(animals, checkedItems, new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
// user checked or unchecked a box
}
});
// add OK and Cancel buttons
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// user clicked OK
}
});
builder.setNegativeButton("Cancel", null);
// create and show the alert dialog
AlertDialog dialog = builder.create();
dialog.show();
Here I hard coded the the which items in the list were already checked. It is more likely that you would want to keep track of them in an ArrayList<Integer>
. See the documentation example for more details. You can also set the checked items to null
if you always want everything to start unchecked.
Kotlin version
// setup the alert builder
val builder = AlertDialog.Builder(context)
builder.setTitle("Choose some animals")
// add a checkbox list
val animals = arrayOf("horse", "cow", "camel", "sheep", "goat")
val checkedItems = booleanArrayOf(true, false, false, true, false)
builder.setMultiChoiceItems(animals, checkedItems) { dialog, which, isChecked ->
// user checked or unchecked a box
}
// add OK and Cancel buttons
builder.setPositiveButton("OK") { dialog, which ->
// user clicked OK
}
builder.setNegativeButton("Cancel", null)
// create and show the alert dialog
val dialog = builder.create()
dialog.show()
context
in the code above, don't use getApplicationContext()
or you will get an IllegalStateException
(see here for why). Instead, get a reference to the activity context, such as with this
.setAdapter
or setCursor
or passing in a Cursor
or ListAdapter
into the setSingleChoiceItems
or setMultiChoiceItems
.To test all of the examples above I just had a simple project with a single button than showed the dialog when clicked:
import android.support.v7.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
}
public void showAlertDialogButtonClicked(View view) {
// example code to create alert dialog lists goes here
}
}
Here is a tutorial about how to do XSL Transformations in C# on MSDN:
http://support.microsoft.com/kb/307322/en-us/
and here how to write files:
http://support.microsoft.com/kb/816149/en-us
just as a side note: if you want to do validation too here is another tutorial (for DTD, XDR, and XSD (=Schema)):
http://support.microsoft.com/kb/307379/en-us/
i added this just to provide some more information.
I think you need two case statements:
SELECT *
FROM sys.indexes i
JOIN sys.partitions p
ON i.index_id = p.index_id
JOIN sys.allocation_units a
ON
-- left side of join on statement
CASE
WHEN a.type IN (1, 3)
THEN a.container_id
WHEN a.type IN (2)
THEN a.container_id
END
=
-- right side of join on statement
CASE
WHEN a.type IN (1, 3)
THEN p.hobt_id
WHEN a.type IN (2)
THEN p.partition_id
END
This is because:
For self-containing Maven project I usually installing all external jar dependencies into project's repository. For SQL Server JDBC driver you can do:
local-repo
in your Maven projectsqljdbc42.jar
into local-repo
folderlocal-repo
folder run mvn deploy:deploy-file -Dfile=sqljdbc42.jar -DartifactId=sqljdbc42 -DgroupId=com.microsoft.sqlserver -DgeneratePom=true -Dpackaging=jar -Dversion=6.0.7507.100 -Durl=file://.
to deploy JAR into local repository (stored together with your code in SCM)sqljdbc42.jar
and downloaded files can be deletedpom.xml
and add reference to project's local repository:
xml
<repositories>
<repository>
<id>parent-local-repository</id>
<name>Parent Local repository</name>
<layout>default</layout>
<url>file://${basedir}/local-repo</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
Now you can run your project everywhere without any additional configurations or installations.The click handler that you are trying to trigger is most likely also attached via $(document).ready()
. What is probably happening is that you are triggering the event before the handler is attached. The solution is to use setTimeout
:
$("document").ready(function() {
setTimeout(function() {
$("ul.galleria li:first-child img").trigger('click');
},10);
});
A delay of 10ms will cause the function to run immediately after all the $(document).ready()
handlers have been called.
OR you check if the element is ready:
$("document").ready(function() {
$("ul.galleria li:first-child img").ready(function() {
$(this).click();
});
});
there are mainly three options are possible for mapping purpose
While using the pojo classes,it is easy for a developer to map with the database. POJO classes are created for database and at the same time value-objects classes are created with getter and setter methods that will easily hold the content.
So,for the purpose of mapping in between java with database, value-objects and POJO classes are implemented.
R.color.black
or some color are obviously integers. It needs a RGB value. You can give your own like #FF123454
which represents various primary colors
pep8 was recently added to PyPi.
It is now super easy to check your code against pep8.
If you're using SQL Server 2005 or later, use varchar(MAX)
. The text
datatype is deprecated and should not be used for new development work. From the docs:
Important
ntext
,text
, andimage
data types will be removed in a future version of Microsoft SQL Server. Avoid using these data types in new development work, and plan to modify applications that currently use them. Use nvarchar(max), varchar(max), and varbinary(max) instead.
You can easily use imcache. A sample code is below.
void example(){
Cache<Integer,Integer> cache = CacheBuilder.heapCache().
cacheLoader(new CacheLoader<Integer, Integer>() {
public Integer load(Integer key) {
return null;
}
}).capacity(10000).build();
}
The String class comes with the format abilities:
System.out.println(String.format("%02d", 5));
for full documentation, here is the doc
this worked for me.
change varchar column to int
change_column :table_name, :column_name, :integer
got:
PG::DatatypeMismatch: ERROR: column "column_name" cannot be cast automatically to type integer
HINT: Specify a USING expression to perform the conversion.
chnged to
change_column :table_name, :column_name, 'integer USING CAST(column_name AS integer)'
By all your powers combined I use this helper class for reading resources from any assembly and any namespace in a generic way.
public class ResourceReader
{
public static IEnumerable<string> FindEmbededResources<TAssembly>(Func<string, bool> predicate)
{
if (predicate == null) throw new ArgumentNullException(nameof(predicate));
return
GetEmbededResourceNames<TAssembly>()
.Where(predicate)
.Select(name => ReadEmbededResource(typeof(TAssembly), name))
.Where(x => !string.IsNullOrEmpty(x));
}
public static IEnumerable<string> GetEmbededResourceNames<TAssembly>()
{
var assembly = Assembly.GetAssembly(typeof(TAssembly));
return assembly.GetManifestResourceNames();
}
public static string ReadEmbededResource<TAssembly, TNamespace>(string name)
{
if (string.IsNullOrEmpty(name)) throw new ArgumentNullException(nameof(name));
return ReadEmbededResource(typeof(TAssembly), typeof(TNamespace), name);
}
public static string ReadEmbededResource(Type assemblyType, Type namespaceType, string name)
{
if (assemblyType == null) throw new ArgumentNullException(nameof(assemblyType));
if (namespaceType == null) throw new ArgumentNullException(nameof(namespaceType));
if (string.IsNullOrEmpty(name)) throw new ArgumentNullException(nameof(name));
return ReadEmbededResource(assemblyType, $"{namespaceType.Namespace}.{name}");
}
public static string ReadEmbededResource(Type assemblyType, string name)
{
if (assemblyType == null) throw new ArgumentNullException(nameof(assemblyType));
if (string.IsNullOrEmpty(name)) throw new ArgumentNullException(nameof(name));
var assembly = Assembly.GetAssembly(assemblyType);
using (var resourceStream = assembly.GetManifestResourceStream(name))
{
if (resourceStream == null) return null;
using (var streamReader = new StreamReader(resourceStream))
{
return streamReader.ReadToEnd();
}
}
}
}
You can use this also
const { ObjectId } = require('mongodb');
const _id = ObjectId("4eb6e7e7e9b7f4194e000001");
it's simplest way to do it
The below code stores the return value in to the variable retVal
and then MsgBox
can be used to display the value:
Dim retVal As Integer
retVal = test()
Msgbox retVal
you can print it in Rstudio with View() more convenient:
df %>% View()
View(df)
Warning!
The Angular v6.1.7 FormArray documentation says:
To change the controls in the array, use the push, insert, or removeAt methods in FormArray itself. These methods ensure the controls are properly tracked in the form's hierarchy. Do not modify the array of AbstractControls used to instantiate the FormArray directly, as that result in strange and unexpected behavior such as broken change detection.
Keep this in mind if you are using the splice
function directly on the controls
array as one of the answer suggested.
Use the removeAt
function.
while (formArray.length !== 0) {
formArray.removeAt(0)
}
TL;DR: Use StandardError
instead for general exception catching. When the original exception is re-raised (e.g. when rescuing to log the exception only), rescuing Exception
is probably okay.
Exception
is the root of Ruby's exception hierarchy, so when you rescue Exception
you rescue from everything, including subclasses such as SyntaxError
, LoadError
, and Interrupt
.
Rescuing Interrupt
prevents the user from using CTRLC to exit the program.
Rescuing SignalException
prevents the program from responding correctly to signals. It will be unkillable except by kill -9
.
Rescuing SyntaxError
means that eval
s that fail will do so silently.
All of these can be shown by running this program, and trying to CTRLC or kill
it:
loop do
begin
sleep 1
eval "djsakru3924r9eiuorwju3498 += 5u84fior8u8t4ruyf8ihiure"
rescue Exception
puts "I refuse to fail or be stopped!"
end
end
Rescuing from Exception
isn't even the default. Doing
begin
# iceberg!
rescue
# lifeboats
end
does not rescue from Exception
, it rescues from StandardError
. You should generally specify something more specific than the default StandardError
, but rescuing from Exception
broadens the scope rather than narrowing it, and can have catastrophic results and make bug-hunting extremely difficult.
If you have a situation where you do want to rescue from StandardError
and you need a variable with the exception, you can use this form:
begin
# iceberg!
rescue => e
# lifeboats
end
which is equivalent to:
begin
# iceberg!
rescue StandardError => e
# lifeboats
end
One of the few common cases where it’s sane to rescue from Exception
is for logging/reporting purposes, in which case you should immediately re-raise the exception:
begin
# iceberg?
rescue Exception => e
# do some logging
raise # not enough lifeboats ;)
end
I'll try to keep this short, I've done this a few months ago for a game I was trying to build, it does a UDP "Client-Server" connection that acts like TCP, you can send (message) (message + object) using this. I've done some testing with it and it works just fine, feel free to modify it if needed.
Also seem pdfjam: http://www2.warwick.ac.uk/fac/sci/statistics/staff/academic/firth/software/pdfjam/
The traditonal 4 bit hex is pretty direct. Hex String to Integer (Assuming value is stored in field called FHexString) :
CONVERT(BIGINT,CONVERT(varbinary(4),
(SELECT master.dbo.fn_cdc_hexstrtobin(
LEFT(FMEID_ESN,8)
))
))
Integer to Hex String (Assuming value is stored in field called FInteger):
(SELECT master.dbo.fn_varbintohexstr(CONVERT(varbinary,CONVERT(int,
FInteger
))))
Important to note is that when you begin to use bit sizes that cause register sharing, especially on an intel machine, your High and Low and Left and Rights in the registers will be swapped due to the little endian nature of Intel. For example, when using a varbinary(3), we're talking about a 6 character Hex. In this case, your bits are paired as the following indexes from right to left "54,32,10". In an intel system, you would expect "76,54,32,10". Since you are only using 6 of the 8, you need to remember to do the swaps yourself. "76,54" will qualify as your left and "32,10" will qualify as your right. The comma separates your high and low. Intel swaps the high and lows, then the left and rights. So to do a conversion...sigh, you got to swap them yourselves for example, the following converts the first 6 of an 8 character hex:
(SELECT master.dbo.fn_replvarbintoint(
CONVERT(varbinary(3),(SELECT master.dbo.fn_cdc_hexstrtobin(
--intel processors, registers are switched, so reverse them
----second half
RIGHT(FHex8,2)+ --0,1 (0 indexed)
LEFT(RIGHT(FHex8,4),2)+ -- 2,3 (oindex)
--first half
LEFT(RIGHT(FHex8,6),2) --4,5
)))
))
It's a bit complicated, so I would try to keep my conversions to 8 character hex's (varbinary(4)).
In summary, this should answer your question. Comprehensively.
Here is a post where someone got it to work. It looks like it requires a registry change.
I found one good thing about using bind is that you get to know the trigger event: something like: "You clicked with event = [ButtonPress event state=Mod1 num=1 x=43 y=20]" due to the code below:
self.submit.bind('<Button-1>', self.parse)
def parse(self, trigger_event):
print("You clicked with event = {}".format(trigger_event))
Comparing the following two ways of coding a button click:
btn = Button(root, text="Click me to submit", command=(lambda: reply(ent.get())))
btn = Button(root, text="Click me to submit")
btn.bind('<Button-1>', (lambda event: reply(ent.get(), e=event)))
def reply(name, e = None):
messagebox.showinfo(title="Reply", message = "Hello {0}!\nevent = {1}".format(name, e))
The first one is using the command function which doesn't take an argument, so no event pass-in is possible. The second one is a bind function which can take an event pass-in and print something like "Hello Charles! event = [ButtonPress event state=Mod1 num=1 x=68 y=12]"
We can left click, middle click or right click a mouse which corresponds to the event number of 1, 2 and 3, respectively. Code:
btn = Button(root, text="Click me to submit")
buttonClicks = ["<Button-1>", "<Button-2>", "<Button-3>"]
for bc in buttonClicks:
btn.bind(bc, lambda e : print("Button clicked with event = {}".format(e.num)))
Output:
Button clicked with event = 1
Button clicked with event = 2
Button clicked with event = 3
Some answers are partially wrong, and some facts in them are partially wrong as well.
Answer your question: Yes! You can.
In Typescript
class A {
private a1;
private a2;
}
Generates the following code in Javascript:
var A = /** @class */ (function () {
function A() {
}
return A;
}());
as @Erik_Cupal said, you could just do:
let a = new A();
let array = return Object.getOwnPropertyNames(a);
But this is incomplete. What happens if your class has a custom constructor? You need to do a trick with Typescript because it will not compile. You need to assign as any:
let className:any = A;
let a = new className();// the members will have value undefined
A general solution will be:
class A {
private a1;
private a2;
constructor(a1:number, a2:string){
this.a1 = a1;
this.a2 = a2;
}
}
class Describer{
describeClass( typeOfClass:any){
let a = new typeOfClass();
let array = Object.getOwnPropertyNames(a);
return array;//you can apply any filter here
}
}
For better understanding this will reference depending on the context.
To understand why it does not return the list:
sort() doesn't return any value while the sort() method just sorts the elements of a given list in a specific order - ascending or descending without returning any value.
So problem is with answer = newList.sort()
where answer is none.
Instead you can just do return newList.sort()
.
The syntax of the sort() method is:
list.sort(key=..., reverse=...)
Alternatively, you can also use Python's in-built function sorted() for the same purpose.
sorted(list, key=..., reverse=...)
Note: The simplest difference between sort() and sorted() is: sort() doesn't return any value while, sorted() returns an iterable list.
So in your case answer = sorted(newList)
.
try using -U
(aka --update-snapshots
) when you run maven
And make sure the dependency definition is correct
SQL Developer 3.1 fixes this issue. Its an early adopter release at the moment though.
Here is a Swift extension to UIImage that rotates the image by any arbitrary angle. Use it like this: let rotatedImage = image.rotated(byDegrees: degree)
.
I used the Objective-C code in one of the other answers and removed a few lines that we incorrect (rotated box stuff) and turned it into an extension for UIImage.
extension UIImage {
func rotate(byDegrees degree: Double) -> UIImage {
let radians = CGFloat(degree*M_PI)/180.0 as CGFloat
let rotatedSize = self.size
let scale = UIScreen.mainScreen().scale
UIGraphicsBeginImageContextWithOptions(rotatedSize, false, scale)
let bitmap = UIGraphicsGetCurrentContext()
CGContextTranslateCTM(bitmap, rotatedSize.width / 2, rotatedSize.height / 2);
CGContextRotateCTM(bitmap, radians);
CGContextScaleCTM(bitmap, 1.0, -1.0);
CGContextDrawImage(bitmap, CGRectMake(-self.size.width / 2, -self.size.height / 2 , self.size.width, self.size.height), self.CGImage );
let newImage = UIGraphicsGetImageFromCurrentImageContext()
return newImage
}
}
What is the difference between web service and WCF?
Web service use only HTTP protocol while transferring data from one application to other application.
But WCF supports more protocols for transporting messages than ASP.NET Web services. WCF supports sending messages by using HTTP, as well as the Transmission Control Protocol (TCP), named pipes, and Microsoft Message Queuing (MSMQ).
To develop a service in Web Service, we will write the following code
[WebService]
public class Service : System.Web.Services.WebService
{
[WebMethod]
public string Test(string strMsg)
{
return strMsg;
}
}
To develop a service in WCF, we will write the following code
[ServiceContract]
public interface ITest
{
[OperationContract]
string ShowMessage(string strMsg);
}
public class Service : ITest
{
public string ShowMessage(string strMsg)
{
return strMsg;
}
}
Web Service is not architecturally more robust. But WCF is architecturally more robust and promotes best practices.
Web Services use XmlSerializer but WCF uses DataContractSerializer. Which is better in performance as compared to XmlSerializer?
For internal (behind firewall) service-to-service calls we use the net:tcp binding, which is much faster than SOAP.
WCF is 25%—50% faster than ASP.NET Web Services, and approximately 25% faster than .NET Remoting.
When would I opt for one over the other?
WCF is used to communicate between other applications which has been developed on other platforms and using other Technology.
For example, if I have to transfer data from .net platform to other application which is running on other OS (like Unix or Linux) and they are using other transfer protocol (like WAS, or TCP) Then it is only possible to transfer data using WCF.
Here is no restriction of platform, transfer protocol of application while transferring the data between one application to other application.
Security is very high as compare to web service
I had the same problem, and found the answer. If you use node.js with express, you need to give it its own function in order for the js file to be reached. For example:
const script = path.join(__dirname, 'script.js');
const server = express().get('/', (req, res) => res.sendFile(script))
If you always know the route, you can simply append the anchor like this:
href="#/route#anchorID
where route
is the current angular route and anchorID
matches an <a id="anchorID">
somewhere on the page
Use the flex-grow
property to the main content div and give the dispaly: flex;
to its parent;
body {_x000D_
height: 100%;_x000D_
position: absolute;_x000D_
margin: 0;_x000D_
}_x000D_
section {_x000D_
height: 100%;_x000D_
display: flex;_x000D_
flex-direction : column;_x000D_
}_x000D_
header {_x000D_
background: tomato;_x000D_
}_x000D_
div {_x000D_
flex: 1; /* or flex-grow: 1 */;_x000D_
overflow-x: auto;_x000D_
background: gold;_x000D_
}_x000D_
footer {_x000D_
background: lightgreen;_x000D_
min-height: 60px;_x000D_
}
_x000D_
<section>_x000D_
<header>_x000D_
header: sized to content_x000D_
<br>(but is it really?)_x000D_
</header>_x000D_
<div>_x000D_
main content: fills remaining space<br>_x000D_
x<br>x<br>x<br>x<br>x<br>x<br>x<br>x<br>_x000D_
x<br>x<br>x<br>x<br>x<br>x<br>x<br>x<br>_x000D_
x<br>x<br>x<br>x<br>x<br>x<br>x<br>x<br>_x000D_
x<br>x<br>x<br>x<br>x<br>x<br>x<br>x<br>_x000D_
x<br>x<br>x<br>x<br>x<br>x<br>x<br>x<br>_x000D_
</div>_x000D_
<footer>_x000D_
footer: fixed height in px_x000D_
</footer>_x000D_
</section>
_x000D_
For me this was to do with a constraint that I was removing at build time. Unticking Remove at build time
fixed the issue, and I suspect the compiler had an issue determining the layout without it.
The error code will mention which Storyboard is causing the issue.
It for example happens in this case here:
void initializeJSP(unknownType Experiment);
Try using std::string
instead of just string
(and include the <string>
header). C++ Standard library classes are within the namespace std::
.
Math.Round(0.5) returns zero due to floating point rounding errors, so you'll need to add a rounding error amount to the original value to ensure it doesn't round down, eg.
Console.WriteLine(Math.Round(0.5, 0).ToString()); // outputs 0 (!!)
Console.WriteLine(Math.Round(1.5, 0).ToString()); // outputs 2
Console.WriteLine(Math.Round(0.5 + 0.00000001, 0).ToString()); // outputs 1
Console.WriteLine(Math.Round(1.5 + 0.00000001, 0).ToString()); // outputs 2
Console.ReadKey();
Similar situation for following configuration:
My solution:
String.Format("{0:#,###.##}", value)
A more complex example from String Formatting in C#:
String.Format("{0:$#,##0.00;($#,##0.00);Zero}", value);
This will output “$1,240.00" if passed 1243.50. It will output the same format but in parentheses if the number is negative, and will output the string “Zero” if the number is zero.
// Page.aspx //
// To count checklist item
int a = ChkMonth.Items.Count;
int count = 0;
for (var i = 0; i < a; i++)
{
if (ChkMonth.Items[i].Selected == true)
{
count++;
}
}
// Page.aspx.cs //
// To access checkbox list item's value //
string YrStrList = "";
foreach (ListItem listItem in ChkMonth.Items)
{
if (listItem.Selected)
{
YrStrList = YrStrList + "'" + listItem.Value + "'" + ",";
}
}
sMonthStr = YrStrList.ToString();
I just ran across the slicing problem and promptly landed here. So let me add my two cents to this.
Let's have an example from "production code" (or something that comes kind of close):
Let's say we have something that dispatches actions. A control center UI for example.
This UI needs to get a list of things that are currently able to be dispatched. So we define a class that contains the dispatch-information. Let's call it Action
. So an Action
has some member variables. For simplicity we just have 2, being a std::string name
and a std::function<void()> f
. Then it has an void activate()
which just executes the f
member.
So the UI gets a std::vector<Action>
supplied. Imagine some functions like:
void push_back(Action toAdd);
Now we have established how it looks from the UI's perspective. No problem so far. But some other guy who works on this project suddenly decides that there are specialized actions that need more information in the Action
object. For what reason ever. That could also be solved with lambda captures. This example is not taken 1-1 from the code.
So the guy derives from Action
to add his own flavour.
He passes an instance of his home-brewed class to the push_back
but then the program goes haywire.
So what happened?
As you might have guessed: the object has been sliced.
The extra information from the instance has been lost, and f
is now prone to undefined behaviour.
I hope this example brings light about for those people who can't really imagine things when talking about A
s and B
s being derived in some manner.
Try below one:
svn copy http://svn.example.com/repos/calc/trunk@rev-no
http://svn.example.com/repos/calc/branches/my-calc-branch
-m "Creating a private branch of /calc/trunk." --parents
No slash "\" between the svn URLs.
You should not do it for UPDATE
and DELETE
, as if there is impact on performance, it is not a positive one.
For INSERT
there might be situations where your INSERT
will raise an exception (UNIQUE CONSTRAINT
violation etc), in which case you might want to prevent it with the IF EXISTS
and handle it more gracefully.
Since the introduction of go.mod , I think both local and external package management becomes easier. Using go.mod, it is possible to have go project outside the GOPATH as well.
Create a folder demoproject and run following command to generate go.mod file
go mod init demoproject
I have a project structure like below inside the demoproject directory.
+-- go.mod
+-- src
+-- main.go
+-- model
+-- model.go
For the demo purpose, insert the following code in the model.go file.
package model
type Employee struct {
Id int32
FirstName string
LastName string
BadgeNumber int32
}
In main.go, I imported Employee model by referencing to "demoproject/src/model"
package main
import (
"demoproject/src/model"
"fmt"
)
func main() {
fmt.Printf("Main Function")
var employee = model.Employee{
Id: 1,
FirstName: "First name",
LastName: "Last Name",
BadgeNumber: 1000,
}
fmt.Printf(employee.FirstName)
}
Just run go get
command inside the project directory.
For example:
go get -u google.golang.org/grpc
It should include module dependency in the go.mod file
module demoproject
go 1.13
require (
golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa // indirect
golang.org/x/sys v0.0.0-20200124204421-9fbb57f87de9 // indirect
golang.org/x/text v0.3.2 // indirect
google.golang.org/genproto v0.0.0-20200122232147-0452cf42e150 // indirect
google.golang.org/grpc v1.26.0 // indirect
)
I was having a similar problem. (No problems training with GradientDescent optimizer, but error raised when using to Adam Optimizer, or any other optimizer with its own variables)
Changing to an interactive session solved this problem for me.
sess = tf.Session()
into
sess = tf.InteractiveSession()
The following function should do the trick. This implementation
and it is also configurable so that you can keep both the self correlations as well as the duplicates. You can also to report as many feature pairs as you wish.
def get_feature_correlation(df, top_n=None, corr_method='spearman',
remove_duplicates=True, remove_self_correlations=True):
"""
Compute the feature correlation and sort feature pairs based on their correlation
:param df: The dataframe with the predictor variables
:type df: pandas.core.frame.DataFrame
:param top_n: Top N feature pairs to be reported (if None, all of the pairs will be returned)
:param corr_method: Correlation compuation method
:type corr_method: str
:param remove_duplicates: Indicates whether duplicate features must be removed
:type remove_duplicates: bool
:param remove_self_correlations: Indicates whether self correlations will be removed
:type remove_self_correlations: bool
:return: pandas.core.frame.DataFrame
"""
corr_matrix_abs = df.corr(method=corr_method).abs()
corr_matrix_abs_us = corr_matrix_abs.unstack()
sorted_correlated_features = corr_matrix_abs_us \
.sort_values(kind="quicksort", ascending=False) \
.reset_index()
# Remove comparisons of the same feature
if remove_self_correlations:
sorted_correlated_features = sorted_correlated_features[
(sorted_correlated_features.level_0 != sorted_correlated_features.level_1)
]
# Remove duplicates
if remove_duplicates:
sorted_correlated_features = sorted_correlated_features.iloc[:-2:2]
# Create meaningful names for the columns
sorted_correlated_features.columns = ['Feature 1', 'Feature 2', 'Correlation (abs)']
if top_n:
return sorted_correlated_features[:top_n]
return sorted_correlated_features
First of all you should have Virtualization Enabled and you can do it from BIOS setting.
After that go to Control Panel\Programs and Click on "Turn Windows features on or off" option.
You will now have a pop up window, spot "Windows Hypervisor Platform" and enable it by checking the check box.
I could do that following the steps:
axios.js
mock fileThe mock will happen automatically
Example of the mock module:
module.exports = {
get: jest.fn((url) => {
if (url === '/something') {
return Promise.resolve({
data: 'data'
});
}
}),
post: jest.fn((url) => {
if (url === '/something') {
return Promise.resolve({
data: 'data'
});
}
if (url === '/something2') {
return Promise.resolve({
data: 'data2'
});
}
}),
create: jest.fn(function () {
return this;
})
};
I guess it might be possible to set some kind of hardcore transition to the top
style of a #container
div
to move your entire page in the desired direction when clicking your anchor. Something like adding a class that has top:-2000px
.
I did use JQuery because I'm to lazy too use native JS, but it is not necessary for what I did.
This is probably not the best possible solution because the top content just moves towards the top and you can't get it back easily, you should definitely use JQuery if you really need that scroll animation.
Another potential treatment is using PATCH after all. A PATCH is defined as something that changes the internal state and is not restricted to appending.
PATCH would solve the problem by allowing you to update already existing items. See: RFC 5789: PATCH
1) Requires .NET framework 4 updated to at least 4.0.2. If you have 4.0.2, then you should have
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319\SKUs\.NETFramework,Version=v4.0.2
If you have installed latest VS 2012 chances are that you already have 4.0.2. Just verify first.
2) Next you need to have an instance of LocalDb
. By default you have an instance whose name is a single v
character followed by the LocalDB release version number in the format xx.x. For example, v11.0
represents SQL Server 2012. Automatic instances are public by default. You can also have named instances which are private. Named instances provide isolation from other instances and can improve performance by reducing resource contention with other database users. You can check the status of instances using the SqlLocalDb.exe
utility (run it from command line).
3) Next your connection string should look like:
"Server=(localdb)\\v11.0;Integrated Security=true;"
or
"Data Source=(localdb)\\test;Integrated Security=true;"
from your code. They both are the same. Notice the two \\
required because \v
and \t
means special characters. Also note that what appears after (localdb)\\
is the name of your LocalDb instance. v11.0
is the default public instance, test
is something I have created manually which is private.
If you have a database (.mdf file) already:
"Server=(localdb)\\Test;Integrated Security=true;AttachDbFileName= myDbFile;"
If you don't have a Sql Server database:
"Server=(localdb)\\v11.0;Integrated Security=true;"
And you can create your own database programmatically:
a) to save it in the default location with default setting:
var query = "CREATE DATABASE myDbName;";
b) To save it in a specific location with your own custom settings:
// your db name
string dbName = "myDbName";
// path to your db files:
// ensure that the directory exists and you have read write permission.
string[] files = { Path.Combine(Application.StartupPath, dbName + ".mdf"),
Path.Combine(Application.StartupPath, dbName + ".ldf") };
// db creation query:
// note that the data file and log file have different logical names
var query = "CREATE DATABASE " + dbName +
" ON PRIMARY" +
" (NAME = " + dbName + "_data," +
" FILENAME = '" + files[0] + "'," +
" SIZE = 3MB," +
" MAXSIZE = 10MB," +
" FILEGROWTH = 10%)" +
" LOG ON" +
" (NAME = " + dbName + "_log," +
" FILENAME = '" + files[1] + "'," +
" SIZE = 1MB," +
" MAXSIZE = 5MB," +
" FILEGROWTH = 10%)" +
";";
And execute!
A sample table can be loaded into the database with something like:
@"CREATE TABLE supportContacts
(
id int identity primary key,
type varchar(20),
details varchar(30)
);
INSERT INTO supportContacts
(type, details)
VALUES
('Email', '[email protected]'),
('Twitter', '@sqlfiddle');";
Note that SqlLocalDb.exe
utility doesnt give you access to databases, you separately need sqlcmd
utility which is sad..
EDIT: moved position of semicolon otherwise error would occur if code was copy/pasted
This example seems to call for a weighted mean as suggested in @andyhayden's comment. For example, there are two polls on 10/25 and one each on 10/26 and 10/27. If you just resample and then take the mean, this effectively gives twice as much weighting to the polls on 10/26 and 10/27 compared to the ones on 10/25.
To give equal weight to each poll rather than equal weight to each day, you could do something like the following.
>>> wt = df.resample('D',limit=5).count()
favorable unfavorable other
enddate
2012-10-25 2 2 2
2012-10-26 1 1 1
2012-10-27 1 1 1
>>> df2 = df.resample('D').mean()
favorable unfavorable other
enddate
2012-10-25 0.495 0.485 0.025
2012-10-26 0.560 0.400 0.040
2012-10-27 0.510 0.470 0.020
That gives you the raw ingredients for doing a poll-based mean instead of a day-based mean. As before, the polls are averaged on 10/25, but the weight for 10/25 is also stored and is double the weight on 10/26 or 10/27 to reflect that two polls were taken on 10/25.
>>> df3 = df2 * wt
>>> df3 = df3.rolling(3,min_periods=1).sum()
>>> wt3 = wt.rolling(3,min_periods=1).sum()
>>> df3 = df3 / wt3
favorable unfavorable other
enddate
2012-10-25 0.495000 0.485000 0.025000
2012-10-26 0.516667 0.456667 0.030000
2012-10-27 0.515000 0.460000 0.027500
2012-10-28 0.496667 0.465000 0.041667
2012-10-29 0.484000 0.478000 0.042000
2012-10-30 0.488000 0.474000 0.042000
2012-10-31 0.530000 0.450000 0.020000
2012-11-01 0.500000 0.465000 0.035000
2012-11-02 0.490000 0.470000 0.040000
2012-11-03 0.490000 0.465000 0.045000
2012-11-04 0.500000 0.448333 0.035000
2012-11-05 0.501429 0.450000 0.032857
2012-11-06 0.503333 0.450000 0.028333
2012-11-07 0.510000 0.435000 0.010000
Note that the rolling mean for 10/27 is now 0.51500 (poll-weighted) rather than 52.1667 (day-weighted).
Also note that there have been changes to the APIs for resample
and rolling
as of version 0.18.0.
Open "command or conda prompt" and run:
conda update conda
conda update anaconda
It's a good idea to run both command twice (one after the other) to be sure that all the basic files are updated.
This should put you back on the latest 'releases', which contains packages that are selected by the people at Continuum to work well together.
If you want the last version of each package run (this can lead to an unstable environment):
conda update --all
Hope this helps.
Sources:
I think is better to change the logical function in the plugin. Around row 552 i change this:
var zIndex = parseInt(this.element.parents().filter(function(){
return $(this).css('z-index') !== 'auto';
}).first().css('z-index'))+10;
into this:
var zIndex = parseInt(this.element.parents().filter(function(){
return $(this).css('z-index') !== 'auto';
}).first().css('z-index')) + 10 * 1000; //think is enought
A few people have suggested adding a .sum()
method to the Array.prototype
. This is generally considered bad practice so I'm not suggesting that you do it.
If you still insist on doing it then this is a succinct way of writing it:
Array.prototype.sum = function() {return [].reduce.call(this, (a,i) => a+i, 0);}
then: [1,2].sum(); // 3
Note that the function added to the prototype is using a mixture of ES5 and ES6 function and arrow syntax. The function
is declared to allow the method to get the this
context from the Array
that you're operating on. I used the =>
for brevity inside the reduce
call.
More importantly, the 2013 versions of Visual Studio Express have all the languages that comes with the commercial versions. You can use the Windows desktop versions not only to program using Windows Forms, it is possible to write those windowed applications with any language that comes with the software, may it be C++ using the windows.h header if you want to actually learn how to create windows applications from scratch, or use Windows form to create windows in C# or visual Basic.
In the past, you had to download one version for each language or type of content. Or just download an all-in-one that still installed separate versions of the software for different languages. Now with 2013 you get all the languages needed in each content oriented version of the 2013 express.
You pick what matters the most to you.
Besides, it might be a good way to learn using notepad and the command line to write and compile, but I find that a bit tedious to use. While using an IDE might be overwhelming at first, you start small, learning how to create a project, write code, compile your code. They have gone way over their heads to ease up your day when you take it for the first time.
With parallel execution, global variables can cause unexpected results if you don't understand what is happening. Here is an example of using a global variable within multiprocessing. We can clearly see that each process works with its own copy of the variable:
import multiprocessing
import os
import random
import sys
import time
def worker(new_value):
old_value = get_value()
set_value(random.randint(1, 99))
print('pid=[{pid}] '
'old_value=[{old_value:2}] '
'new_value=[{new_value:2}] '
'get_value=[{get_value:2}]'.format(
pid=str(os.getpid()),
old_value=old_value,
new_value=new_value,
get_value=get_value()))
def get_value():
global global_variable
return global_variable
def set_value(new_value):
global global_variable
global_variable = new_value
global_variable = -1
print('before set_value(), get_value() = [%s]' % get_value())
set_value(new_value=-2)
print('after set_value(), get_value() = [%s]' % get_value())
processPool = multiprocessing.Pool(processes=5)
processPool.map(func=worker, iterable=range(15))
Output:
before set_value(), get_value() = [-1]
after set_value(), get_value() = [-2]
pid=[53970] old_value=[-2] new_value=[ 0] get_value=[23]
pid=[53971] old_value=[-2] new_value=[ 1] get_value=[42]
pid=[53970] old_value=[23] new_value=[ 4] get_value=[50]
pid=[53970] old_value=[50] new_value=[ 6] get_value=[14]
pid=[53971] old_value=[42] new_value=[ 5] get_value=[31]
pid=[53972] old_value=[-2] new_value=[ 2] get_value=[44]
pid=[53973] old_value=[-2] new_value=[ 3] get_value=[94]
pid=[53970] old_value=[14] new_value=[ 7] get_value=[21]
pid=[53971] old_value=[31] new_value=[ 8] get_value=[34]
pid=[53972] old_value=[44] new_value=[ 9] get_value=[59]
pid=[53973] old_value=[94] new_value=[10] get_value=[87]
pid=[53970] old_value=[21] new_value=[11] get_value=[21]
pid=[53971] old_value=[34] new_value=[12] get_value=[82]
pid=[53972] old_value=[59] new_value=[13] get_value=[ 4]
pid=[53973] old_value=[87] new_value=[14] get_value=[70]
I'm not an Oracle user (well, lately anyhow), BUT...
In most databases (and in precise language), a date doesn't include a time. Having a date doesn't imply that you are denoting a specific second on that date. Generally if you want a time as well as a date, that's called a timestamp.
select P.*,
A.Street,
A.City,
A.State
from Preson P
inner join Address A on P.id=A.Person_id
where A.Zip=97229
Order by A.Street,A.City,A.State
Best of both worlds:
using System.Runtime.InteropServices;
[DllImport("winmm.dll", EntryPoint = "timeBeginPeriod", SetLastError = true)]
private static extern uint TimeBeginPeriod(uint uMilliseconds);
[DllImport("winmm.dll", EntryPoint = "timeEndPeriod", SetLastError = true)]
private static extern uint TimeEndPeriod(uint uMilliseconds);
/**
* Extremely accurate sleep is needed here to maintain performance so system resolution time is increased
*/
private void accurateSleep(int milliseconds)
{
//Increase timer resolution from 20 miliseconds to 1 milisecond
TimeBeginPeriod(1);
Stopwatch stopwatch = new Stopwatch();//Makes use of QueryPerformanceCounter WIN32 API
stopwatch.Start();
while (stopwatch.ElapsedMilliseconds < milliseconds)
{
//So we don't burn cpu cycles
if ((milliseconds - stopwatch.ElapsedMilliseconds) > 20)
{
Thread.Sleep(5);
}
else
{
Thread.Sleep(1);
}
}
stopwatch.Stop();
//Set it back to normal.
TimeEndPeriod(1);
}
Here is how I made a script that could take either command line inputs or have a text file redirected.
if ($#ARGV < 1) {
@ARGV = ();
@ARGV = <>;
chomp(@ARGV);
}
This will reassign the contents of the file to @ARGV, from there you just process @ARGV as if someone was including command line options.
WARNING
If no file is redirected, the program will sit their idle because it is waiting for input from STDIN.
I have not figured out a way to detect if a file is being redirected in yet to eliminate the STDIN issue.
You need to use regular expressions in your custom validator. For example, here's the code that allows only 9 digits in the input fields:
function ssnValidator(control: FormControl): {[key: string]: any} {
const value: string = control.value || '';
const valid = value.match(/^\d{9}$/);
return valid ? null : {ssn: true};
}
Take a look at a sample app here:
use this command php artisan migrate --path=/database/migrations/my_migration.php
it worked for me..
A file is almost a list of lines. You can trivially use it in a for loop.
myFile= open( "SomeFile.txt", "r" )
for x in myFile:
print x
myFile.close()
Or, if you want an actual list of lines, simply create a list from the file.
myFile= open( "SomeFile.txt", "r" )
myLines = list( myFile )
myFile.close()
print len(myLines), myLines
You can't do someList[i]
to put a new item at the end of a list. You must do someList.append(i)
.
Also, never start a simple variable name with an uppercase letter. List
confuses folks who know Python.
Also, never use a built-in name as a variable. list
is an existing data type, and using it as a variable confuses folks who know Python.
Have a look at the python documentation for filter(function, iterable)
(from here):
Construct an iterator from those elements of iterable for which function returns true.
So in order to get a list back you have to use list class:
shesaid = list(filter(greetings(), ["hello", "goodbye"]))
But this probably isn't what you wanted, because it tries to call the result of greetings()
, which is "hello", on the values of your input list, and this won't work. Here also the iterator type comes into play, because the results aren't generated until you use them (for example by calling list()
on it). So at first you won't get an error, but when you try to do something with shesaid
it will stop working:
>>> print(list(shesaid))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'str' object is not callable
If you want to check which elements in your list are equal to "hello" you have to use something like this:
shesaid = list(filter(lambda x: x == "hello", ["hello", "goodbye"]))
(I put your function into a lambda, see Randy C's answer for a "normal" function)
Axios. get('foo.com')
.then((response) => {})
.catch((error) => {
if(error. response){
console.log(error. response. data)
console.log(error. response. status);
}
})
Use option bty = "n"
in legend
to remove the box around the legend. For example:
legend(1, 5,
"This legend text should not be disturbed by the dotted grey lines,\nbut the plotted dots should still be visible",
bty = "n")
Note that setTimeout
and setInterval
are very different functions:
setTimeout
will execute the code once, after the timeout.setInterval
will execute the code forever, in intervals of the provided timeout.Both functions return a timer ID which you can use to abort the timeout. All you have to do is store that value in a variable and use it as argument to clearTimeout(tid)
or clearInterval(tid)
respectively.
So, depending on what you want to do, you have two valid choices:
// set timeout
var tid = setTimeout(mycode, 2000);
function mycode() {
// do some stuff...
tid = setTimeout(mycode, 2000); // repeat myself
}
function abortTimer() { // to be called when you want to stop the timer
clearTimeout(tid);
}
or
// set interval
var tid = setInterval(mycode, 2000);
function mycode() {
// do some stuff...
// no need to recall the function (it's an interval, it'll loop forever)
}
function abortTimer() { // to be called when you want to stop the timer
clearInterval(tid);
}
Both are very common ways of achieving the same.
Given the following sample
myData <- data.frame(A=rep(1:2, 3), B=rep(1:3, 2), Pulse=20:25)
then
myData$A <-as.factor(myData$A)
myData$B <-as.factor(myData$B)
or you could select your columns altogether and wrap it up nicely:
# select columns
cols <- c("A", "B")
myData[,cols] <- data.frame(apply(myData[cols], 2, as.factor))
levels(myData$A) <- c("long", "short")
levels(myData$B) <- c("1kg", "2kg", "3kg")
To obtain
> myData
A B Pulse
1 long 1kg 20
2 short 2kg 21
3 long 3kg 22
4 short 1kg 23
5 long 2kg 24
6 short 3kg 25
\n is the line break used by Unix(-like) systems, \r\n is used by windows. This has nothing to do with C#.
I think you can get the data you want from INFORMATION_SCHEMA TABLES.
You can find more info here: http://dev.mysql.com/doc/refman/5.0/en/tables-table.html
this command solve my problem on github CI job and virtualbox
brew install [email protected]
cp /usr/local/opt/[email protected]/lib/pkgconfig/*.pc /usr/local/lib/pkgconfig/
I did this inside the render() method:
render() {
const project = () => {
switch(this.projectName) {
case "one": return <ComponentA />;
case "two": return <ComponentB />;
case "three": return <ComponentC />;
case "four": return <ComponentD />;
default: return <h1>No project match</h1>
}
}
return (
<div>{ project() }</div>
)
}
I tried to keep the render() return clean, so I put my logic in a 'const' function right above. This way I can also indent my switch cases neatly.
You can define some default values and it prevents the fields from being serialized.
[XmlElement, DefaultValue("")]
string data;
[XmlArray, DefaultValue(null)]
List<string> data;
Player[] players = Stream.iterate(0, x-> x+1 ).limit(PlayerCount).map(i -> new Player(i)).toArray(Player[]::new);
You can use the focusout event to detect keyboard dismissal. It's like blur, but bubbles. It will fire when the keyboard closes (but also in other cases, of course). In Safari and Chrome the event can only be registered with addEventListener, not with legacy methods. Here is an example I used to restore a Phonegap app after keyboard dismissal.
document.addEventListener('focusout', function(e) {window.scrollTo(0, 0)});
Without this snippet, the app container stayed in the up-scrolled position until page refresh.
You need $route defined in your module and change the JS to this.
$scope.backLinkClick = function () {
window.location.reload();
};
that works fine for me.
This should fix your problem: android:layout_weight="1"
.
You can also include this task within another macro, without opening a new one:
I don't put Sub and end Sub, because the macro contains much longer code, as per picture below
With Sheets("1_PL").Range("EF1631:JJ1897")
With .Borders
.LineStyle = xlContinuous
.Color = vbBlack
.Weight = xlThin
End With
[![enter image description here][1]][1]End With
I use the AbsoluteUri and you can get it like this:
string myURI = Request.Url.AbsoluteUri;
if (!WebSecurity.IsAuthenticated) {
Response.Redirect("~/Login?returnUrl="
+ Request.Url.AbsoluteUri );
Then after you login:
var returnUrl = Request.QueryString["returnUrl"];
if(WebSecurity.Login(username,password,true)){
Context.RedirectLocal(returnUrl);
It works well for me.
use
Date date = new Date();
String strDate = sdf.format(date);
intead Of
Calendar cal = Calendar.getInstance();
String strDate = sdf.format(cal.getTime());
You can get ID only after saving, instead you can create a new Guid and assign before saving.
From the bash
manpage:
[[ expression ]]
- return a status of 0 or 1 depending on the evaluation of the conditional expression expression.
And, for expressions, one of the options is:
expression1 && expression2
- true if bothexpression1
andexpression2
are true.
So you can and
them together as follows (-n
is the opposite of -z
so we can get rid of the !
):
if [[ -n "$var" && -e "$var" ]] ; then
echo "'$var' is non-empty and the file exists"
fi
However, I don't think it's needed in this case, -e xyzzy
is true if the xyzzy
file exists and can quite easily handle empty strings. If that's what you want then you don't actually need the -z
non-empty check:
pax> VAR=xyzzy
pax> if [[ -e $VAR ]] ; then echo yes ; fi
pax> VAR=/tmp
pax> if [[ -e $VAR ]] ; then echo yes ; fi
yes
In other words, just use:
if [[ -e "$var" ]] ; then
echo "'$var' exists"
fi
Try this:
> HISTTIMEFORMAT="%d/%m/%y %T "
> history
You can adjust the format to your liking, of course.
In the case of CROSS ORIGIN request read this:
I faced this situation and at first I chose to use the Authorization
Header and later removed it after facing the following issue.
Authorization
Header is considered a custom header. So if a cross-domain request is made with the Autorization
Header set, the browser first sends a preflight request. A preflight request is an HTTP request by the OPTIONS method, this request strips all the parameters from the request. Your server needs to respond with Access-Control-Allow-Headers
Header having the value of your custom header (Authorization
header).
So for each request the client (browser) sends, an additional HTTP request(OPTIONS) was being sent by the browser. This deteriorated the performance of my API. You should check if adding this degrades your performance. As a workaround I am sending tokens in http parameters, which I know is not the best way of doing it but I couldn't compromise with the performance.
You could do this, which facilitates reading:
>&2 echo "error"
>&2
copies file descriptor #2 to file descriptor #1. Therefore, after this redirection is performed, both file descriptors will refer to the same file: the one file descriptor #2 was originally referring to. For more information see the Bash Hackers Illustrated Redirection Tutorial.
msgbox ("Message goes here",0+16,"Title goes here")
if the user is supposed to make a decision the variable can be added like this.
variable=msgbox ("Message goes here",0+16,"Title goes here")
The numbers in the middle vary what the message box looks like. Here is the list
0 - ok button only
1 - ok and cancel
2 - abort, retry and ignore
3 - yes no and cancel
4 - yes and no
5 - retry and cancel
TO CHANGE THE SYMBOL (RIGHT NUMBER)
16 - critical message icon
32 - warning icon
48 - warning message
64 - info message
DEFAULT BUTTON
0 = vbDefaultButton1 - First button is default
256 = vbDefaultButton2 - Second button is default
512 = vbDefaultButton3 - Third button is default
768 = vbDefaultButton4 - Fourth button is default
SYSTEM MODAL
4096 = System modal, alert will be on top of all applications
Note: There are some extra numbers. You just have to add them to the numbers already there like
msgbox("Hello World", 0+16+0+4096)
from https://www.instructables.com/id/The-Ultimate-VBS-Tutorial/
Very useful thing have applied today in my project. One div had to be aligned right, with no floating applied.
Applying code made my goal achieved:
.div {
margin-right: 0px;
margin-left: auto;
}
When compare something with Boolean it works like following
Step 1: Convert boolean
to Number
Number(true) // 1
and Number(false) // 0
Step 2: Compare both sides
boolean == someting
-> Number(boolean) === someting
If compare 1
and 2
with true
you will get the following results
true == 1
-> Number(true) === 1
-> 1 === 1
-> true
And
true == 2
-> Number(true) === 1
-> 1 === 2
-> false
Try pytest -s -v test_login.py
for more info in console.
-v
it's a short --verbose
-s
means 'disable all capturing'
For deployment better to set up classpath exactly and keep environment clear. Or at *.bat (the same for linux, but with correct variables symbols):
CLASSPATH="c:\lib;d:\temp\test.jar;<long classpath>"
CLASSPATH=%CLASSPATH%;"<another_logical_droup_of_classpath"
java -cp %CLASSPATH% com.test.MainCLass
Or at command line or *.bat (for *.sh too) if classpath id not very long:
java -cp "c:\lib;d:\temp\test.jar;<short classpath>"
You can use Material design sliders instead of seekbar
<com.google.android.material.slider.Slider
...
android:valueFrom="60"
android:valueTo="180"
android:stepSize="10.0" />'
for more check here https://material.io/components/sliders/android
You can pass data as the third argument to call()
. Or, depending on your API, it's possible you may want to use the sixth parameter.
From the docs:
$this->call($method, $uri, $parameters, $files, $server, $content);
Print integer in hex-value with zero-padding (if needed) :
int intValue = 1234;
Console.WriteLine("{0,0:D4} {0,0:X3}", intValue);
https://docs.microsoft.com/en-us/dotnet/standard/base-types/how-to-pad-a-number-with-leading-zeros
Rename the branch to master
by:
git branch -M branch_name master
/<b>(.*?)<\/b>/g
Add g
(global) flag after:
/<b>(.*?)<\/b>/g.exec(str)
//^-----here it is
However if you want to get all matched elements, then you need something like this:
var str = "<b>Bob</b>, I'm <b>20</b> years old, I like <b>programming</b>.";
var result = str.match(/<b>(.*?)<\/b>/g).map(function(val){
return val.replace(/<\/?b>/g,'');
});
//result -> ["Bob", "20", "programming"]
If an element has attributes, regexp will be:
/<b [^>]+>(.*?)<\/b>/g.exec(str)
I don't know if this is still actual but problem was with Encoding. Changing to ANSI resolved the problem for me.
Here's a quicker way than multi-layer menus without resorting to plug-ins:
Use the Quick Access tool at the upper left corner.
Type in "font", then, from the list that drops down, click on the link for "Preferences->Colors and Fonts->General->Appearance".
One click replaces the 4 needed to get there through menus. I do it so often, my Quick Access tool pulls it up as a previous choice right at the top of the list so I can just type "font" with a tap on the enter key and Boom!, I'm there.
If you want a keyboard shortcut, Ctrl+3 sets the focus to the Quick Access tool. Better yet, this even automatically brings up a list with your previous choices. The last one you chose will be on top, in which case a simple Ctrl+3 followed by enter would bring you straight there! I use this all the time to make it bigger during long typing or reading sessions to ease eye strain, or to make it smaller if I need more text on the screen at one time to make it easier to find something.
It's not quite as nice as zooming with the scroll wheel, but it's a lot better than navigating through the menus every time!
Misko Hevery did an excellent introductory Google Tech Talk where he talks about objects in Javascript. I've found this to be a good starting point for people either questioning the use of objects in Javascript, or wanting to get started with them:
you can do this:
SELECT
CustomerId,
FirstName,
LastName,
Email
INTO #tempCustomer
FROM
Customer
WHERE
CustomerId = @CustomerId
then later
SELECT CustomerId FROM #tempCustomer
you doesn't need to declare the structure of #tempCustomer
and dont forget to clean your project after writing these lines you`ll a get an error in your xml file until you´ve cleaned your project in eclipse: Project->Clean...
For loading animated gifs stored in a source package (in the source code), this worked for me:
URL url = MyClass.class.getResource("/res/images/animated.gif");
ImageIcon imageIcon = new ImageIcon(url);
JLabel label = new JLabel(imageIcon);
You can execute bits of code once for a class before an object is constructed in the static blocks.
E.g.
class A {
static int var1 = 6;
static int var2 = 9;
static int var3;
static long var4;
static Date date1;
static Date date2;
static {
date1 = new Date();
for(int cnt = 0; cnt < var2; cnt++){
var3 += var1;
}
System.out.println("End first static init: " + new Date());
}
}
<td style="white-space: nowrap">
The nowrap
attribute I believe is deprecated. The above is the preferred way.
The curly braces mean concatenation, from most significant bit (MSB) on the left down to the least significant bit (LSB) on the right. You are creating a 32-bit bus (result) whose 16 most significant bits consist of 16 copies of bit 15 (the MSB) of the a bus, and whose 16 least significant bits consist of just the a bus (this particular construction is known as sign extension, which is needed e.g. to right-shift a negative number in two's complement form and keep it negative rather than introduce zeros into the MSBits).
There is a tutorial here*, but it doesn't explain too much more than the above paragraph.
For what it's worth, the nested curly braces around a[15:0]
are superfluous.
*Beware: the example within the tutorial link contains a typo when demonstrating multiple concatenations - the (2{C}}
should be a {2{2}}
.
CLIENT
namespace SocketKlient
{
class Program
{
static Socket Klient;
static IPEndPoint endPoint;
static void Main(string[] args)
{
Klient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
string command;
Console.WriteLine("Write IP address");
command = Console.ReadLine();
IPAddress Address;
while(!IPAddress.TryParse(command, out Address))
{
Console.WriteLine("wrong IP format");
command = Console.ReadLine();
}
Console.WriteLine("Write port");
command = Console.ReadLine();
int port;
while (!int.TryParse(command, out port) && port > 0)
{
Console.WriteLine("Wrong port number");
command = Console.ReadLine();
}
endPoint = new IPEndPoint(Address, port);
ConnectC(Address, port);
while(Klient.Connected)
{
Console.ReadLine();
Odesli();
}
}
public static void ConnectC(IPAddress ip, int port)
{
IPEndPoint endPoint = new IPEndPoint(ip, port);
Console.WriteLine("Connecting...");
try
{
Klient.Connect(endPoint);
Console.WriteLine("Connected!");
}
catch
{
Console.WriteLine("Connection fail!");
return;
}
Task t = new Task(WaitForMessages);
t.Start();
}
public static void SendM()
{
string message = "Actualy date is " + DateTime.Now;
byte[] buffer = Encoding.UTF8.GetBytes(message);
Console.WriteLine("Sending: " + message);
Klient.Send(buffer);
}
public static void WaitForMessages()
{
try
{
while (true)
{
byte[] buffer = new byte[64];
Console.WriteLine("Waiting for answer");
Klient.Receive(buffer, 0, buffer.Length, 0);
string message = Encoding.UTF8.GetString(buffer);
Console.WriteLine("Answer: " + message);
}
}
catch
{
Console.WriteLine("Disconnected");
}
}
}
}
Restart computer solved it for me.
Git version: 2.27.0.windows.1
OS version: Windows 10 v1909
AFAIK, no, you can't. You have to remove it and recreate it. Actually, you can overwrite a symlink and thus update the pathname referenced by it:
$ ln -s .bashrc test
$ ls -al test
lrwxrwxrwx 1 pascal pascal 7 2009-09-23 17:12 test -> .bashrc
$ ln -s .profile test
ln: creating symbolic link `test': File exists
$ ln -s -f .profile test
$ ls -al test
lrwxrwxrwx 1 pascal pascal 8 2009-09-23 17:12 test -> .profile
EDIT: As the OP pointed out in a comment, using the --force
option will make ln
perform a system call to unlink()
before symlink()
. Below, the output of strace
on my linux box proving it:
$ strace -o /tmp/output.txt ln -s -f .bash_aliases test
$ grep -C3 ^unlink /tmp/output.txt
lstat64("test", {st_mode=S_IFLNK|0777, st_size=7, ...}) = 0
stat64(".bash_aliases", {st_mode=S_IFREG|0644, st_size=2043, ...}) = 0
symlink(".bash_aliases", "test") = -1 EEXIST (File exists)
unlink("test") = 0
symlink(".bash_aliases", "test") = 0
close(0) = 0
close(1) = 0
So I guess the final answer is "no".
EDIT: The following is copied from Arto Bendiken's answer over on unix.stackexchange.com, circa 2016.
This can indeed be done atomically with rename(2)
, by first creating the new symlink under a temporary name and then cleanly overwriting the old symlink in one go. As the man page states:
If newpath refers to a symbolic link the link will be overwritten.
In the shell, you would do this with mv -T
as follows:
$ mkdir a b
$ ln -s a z
$ ln -s b z.new
$ mv -T z.new z
You can strace
that last command to make sure it is indeed using rename(2)
under the hood:
$ strace mv -T z.new z
lstat64("z.new", {st_mode=S_IFLNK|0777, st_size=1, ...}) = 0
lstat64("z", {st_mode=S_IFLNK|0777, st_size=1, ...}) = 0
rename("z.new", "z") = 0
Note that in the above, both mv -T
and strace
are Linux-specific.
On FreeBSD, use mv -h
alternately.
Editor's note: This is how Capistrano has done it for years now, ever since ~2.15. See this pull request.