Google Maps shows "For development purposes only"
If you want a free simple location map showing a single marked location, for your website, Then
- Go to AddMap.
- Here you can fill details to fully customize your map like location details, sizing and formatting of map.
- Finally to add google map api key, Generate it using this method.
Let me know If this would help..
How to draw vertical lines on a given plot in matplotlib
The standard way to add vertical lines that will cover your entire plot window without you having to specify their actual height is plt.axvline
import matplotlib.pyplot as plt
plt.axvline(x=0.22058956)
plt.axvline(x=0.33088437)
plt.axvline(x=2.20589566)
OR
xcoords = [0.22058956, 0.33088437, 2.20589566]
for xc in xcoords:
plt.axvline(x=xc)
You can use many of the keywords available for other plot commands (e.g. color
, linestyle
, linewidth
...). You can pass in keyword arguments ymin
and ymax
if you like in axes corrdinates (e.g. ymin=0.25
, ymax=0.75
will cover the middle half of the plot). There are corresponding functions for horizontal lines (axhline
) and rectangles (axvspan
).
How to print VARCHAR(MAX) using Print Statement?
This should work properly this is just an improvement of previous answers.
DECLARE @Counter INT
DECLARE @Counter1 INT
SET @Counter = 0
SET @Counter1 = 0
DECLARE @TotalPrints INT
SET @TotalPrints = (LEN(@QUERY) / 4000) + 1
print @TotalPrints
WHILE @Counter < @TotalPrints
BEGIN
-- Do your printing...
print(substring(@query,@COUNTER1,@COUNTER1+4000))
set @COUNTER1 = @Counter1+4000
SET @Counter = @Counter + 1
END
How to obtain image size using standard Python class (without using external library)?
While it's possible to call open(filename, 'rb')
and check through the binary image headers for the dimensions, it seems much more useful to install PIL and spend your time writing great new software! You gain greater file format support and the reliability that comes from widespread usage. From the PIL documentation, it appears that the code you would need to complete your task would be:
from PIL import Image
im = Image.open('filename.png')
print 'width: %d - height: %d' % im.size # returns (width, height) tuple
As for writing code yourself, I'm not aware of a module in the Python standard library that will do what you want. You'll have to open()
the image in binary mode and start decoding it yourself. You can read about the formats at:
What is the @Html.DisplayFor syntax for?
Html.DisplayFor()
will render the DisplayTemplate that matches the property's type.
If it can't find any, I suppose it invokes .ToString()
.
If you don't know about display templates, they're partial views that can be put in a DisplayTemplates
folder inside the view folder associated to a controller.
Example:
If you create a view named String.cshtml
inside the DisplayTemplates
folder of your views folder (e.g Home
, or Shared
) with the following code:
@model string
@if (string.IsNullOrEmpty(Model)) {
<strong>Null string</strong>
}
else {
@Model
}
Then @Html.DisplayFor(model => model.Title)
(assuming that Title
is a string) will use the template and display <strong>Null string</strong>
if the string is null, or empty.
Source file 'Properties\AssemblyInfo.cs' could not be found
This rings a bell. I came across a similar problem in the past,
- if you expand Properties folder of the project can you see 'AssemblyInfo.cs' if not that is where the problem is. An assembly info file consists of all of the build options for the project, including version, company name, GUID, compilers options....etc
You can generate an assemblyInfo.cs by right clicking the project and chosing properties. In the application tab fill in the details and press save, this will generate the assemblyInfo.cs file for you. If you build your project after that, it should work.
Cheers, Tarun
Update 2016-07-08:
For Visual Studio 2010 through the most recent version (2015 at time of writing), LandedGently's comment still applies:
After you select project Properties and the Application tab as @Tarun mentioned, there is a button "Assembly Information..." which opens another dialog. You need to at least fill in the Title here. VS will add the GUID and versions, but if the title is empty, it will not create the AssemblyInfo.cs file.
Specify JDK for Maven to use
For Java 9 :
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<source>9</source>
<target>9</target>
</configuration>
</plugin>
</plugins>
</build>
How to remove border from specific PrimeFaces p:panelGrid?
As mentioned by BalusC, the border is set by PrimeFaces on the generated tr
and td
elements, not on the table
. However when trying with PrimeFaces version 5, it looks like there is a more specific match from the PrimeFaces CSS .ui-panelgrid .ui-panelgrid-cell > solid
which still result in black borders being shown when appyling the style suggested.
Try using following style in order to overide the Primefaces one without using the !important
declaration:
.companyHeaderGrid tr, .companyHeaderGrid td.ui-panelgrid-cell {
border: none;
}
As mention make sure your CSS is loaded after the PrimeFaces one.
Get full query string in C# ASP.NET
Request.QueryString
returns you a collection of Key/Value pairs representing the Query String. Not a String. Don't think that would cause a Object Reference error though. The reason your getting that is because as Mauro pointed out in the comments. It's QueryString and not Querystring.
Try:
Request.QueryString.ToString();
or
<%
string URL = Request.Url.AbsoluteUri
System.Net.WebClient wc = new System.Net.WebClient();
string data = wc.DownloadString(URL);
Response.Output.Write(data);
%>
Same as your code but Request.Url.AbsoluteUri
will return the full path, including the query string.
USB Debugging option greyed out
How to Enable USB Debugging for LG Optimus (LGD415). Android version 4.4.2 (KitKat)
Go to this website and download the drivers to your phone:
http://www.lg.com/us/support/mobile-support
For example, mine would be:
http://www.lg.com/us/support-mobile/lg-LGD415RD. Then click on “Software Update & Drivers”
On your phone, you need to enable USB debugging. To do so,
Go to “Settings”.
Go to “About Phone”
Go to “Software Information”
Tap “Build number” five times.
A pop-up will appear saying “You are now a developer”. Your’re not done yet.
Go back to your phone’s home page by pushing the home button.
Go to “Settings”.
Go to “Developer options”
Click the “USB debugging- Turn on debug mode when USB is connected”. A blue checkmark will appear.
(EDIT: If USB Debugging is greyed out, unplug your phone. USB Debugging should no longer be greyed out. If it is not greyed out, check the box and plug your phone into your PC.)
Unplug your phone from your PC. Then plug it back in. On the pop-up, make sure you set it to “Media Sync (MTP)”.
Now your phone will show up on an option when you want to run your app in Eclipse.
(Look for dialog box on phone and agree to allow debugging connection with your computer.)
(Also, go to Control Panel | Device Manager and make sure there are TWO entries for your phone, similar to those expanded below.)
Django TemplateDoesNotExist?
Django TemplateDoesNotExist
error means simply that the framework can't find the template file.
To use the template-loading API, you'll need to tell the framework where you store your templates. The place to do this is in your settings file (settings.py
) by TEMPLATE_DIRS
setting. By default it's an empty tuple, so this setting tells Django's template-loading mechanism where to look for templates.
Pick a directory where you'd like to store your templates and add it to TEMPLATE_DIRS e.g.:
TEMPLATE_DIRS = (
'/home/django/myproject/templates',
)
Splitting words into letters in Java
Including numbers but not whitespace:
"Stack Me 123 Heppa1 oeu".replaceAll("\\W","").toCharArray();
=> S, t, a, c, k, M, e, 1, 2, 3, H, e, p, p, a, 1, o, e, u
Without numbers and whitespace:
"Stack Me 123 Heppa1 oeu".replaceAll("[^a-z^A-Z]","").toCharArray()
=> S, t, a, c, k, M, e, H, e, p, p, a, o, e, u
Callback to a Fragment from a DialogFragment
You should define an interface
in your fragment class and implement that interface in its parent activity. The details are outlined here http://developer.android.com/guide/components/fragments.html#EventCallbacks . The code would look similar to:
Fragment:
public static class FragmentA extends DialogFragment {
OnArticleSelectedListener mListener;
// Container Activity must implement this interface
public interface OnArticleSelectedListener {
public void onArticleSelected(Uri articleUri);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnArticleSelectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + " must implement OnArticleSelectedListener");
}
}
}
Activity:
public class MyActivity extends Activity implements OnArticleSelectedListener{
...
@Override
public void onArticleSelected(Uri articleUri){
}
...
}
Coerce multiple columns to factors at once
Choose some columns to coerce to factors:
cols <- c("A", "C", "D", "H")
Use lapply()
to coerce and replace the chosen columns:
data[cols] <- lapply(data[cols], factor) ## as.factor() could also be used
Check the result:
sapply(data, class)
# A B C D E F G
# "factor" "integer" "factor" "factor" "integer" "integer" "integer"
# H I J
# "factor" "integer" "integer"
jQuery Form Validation before Ajax submit
I think submitHandler with jquery validation is good solution. Please get idea from this code. Inspired from @Darin Dimitrov
$('.calculate').validate({
submitHandler: function(form) {
$.ajax({
url: 'response.php',
type: 'POST',
data: $(form).serialize(),
success: function(response) {
$('#'+form.id+' .ht-response-data').html(response);
}
});
}
});
how to get files from <input type='file' .../> (Indirect) with javascript
If you are looking to style a file input element, look at open file dialog box in javascript. If you are looking to grab the files associated with a file input element, you must do something like this:
inputElement.onchange = function(event) {
var fileList = inputElement.files;
//TODO do something with fileList.
}
See this MDN article for more info on the FileList
type.
Note that the code above will only work in browsers that support the File API. For IE9 and earlier, for example, you only have access to the file name. The input element has no files
property in non-File API browsers.
Add items in array angular 4
Your empList
is object type but you are trying to push strings
Try this
this.empList.push({this.name,this.empoloyeeID});
What is the difference between jQuery: text() and html() ?
The different is .html()
evaluate as a html, .text()
avaluate as a text.
Consider a block of html
HTML
<div id="mydiv">
<div class="mydiv">
This is a div container
<ul>
<li><a href="#">Link 1</a></li>
<li><a href="#">Link 2</a></li>
</ul>
a text after ul
</div>
</div>
JS
var out1 = $('#mydiv').html();
var out2 = $('#mydiv').text();
console.log(out1) // This output all the html tag
console.log(out2) // This is output just the text 'This is a div container Link 1 Link 2 a text after ul'
The illustration is from this link http://api.jquery.com/text/
How to list all installed packages and their versions in Python?
If you want to get information about your installed python distributions and don't want to use your cmd console or terminal for it, but rather through python code, you can use the following code (tested with python 3.4):
import pip #needed to use the pip functions
for i in pip.get_installed_distributions(local_only=True):
print(i)
The pip.get_installed_distributions(local_only=True)
function-call returns an iterable and because of the for-loop and the print function the elements contained in the iterable are printed out separated by new line characters (\n
).
The result will (depending on your installed distributions) look something like this:
cycler 0.9.0
decorator 4.0.4
ipykernel 4.1.0
ipython 4.0.0
ipython-genutils 0.1.0
ipywidgets 4.0.3
Jinja2 2.8
jsonschema 2.5.1
jupyter 1.0.0
jupyter-client 4.1.1
#... and so on...
Difference between a Structure and a Union
Unions come handy while writing a byte ordering function which is given below. It's not possible with structs.
int main(int argc, char **argv) {
union {
short s;
char c[sizeof(short)];
} un;
un.s = 0x0102;
if (sizeof(short) == 2) {
if (un.c[0] == 1 && un.c[1] == 2)
printf("big-endian\n");
else if (un.c[0] == 2 && un.c[1] == 1)
printf("little-endian\n");
else
printf("unknown\n");
} else
printf("sizeof(short) = %d\n", sizeof(short));
exit(0);
}
// Program from Unix Network Programming Vol. 1 by Stevens.
CustomErrors mode="Off"
It's also possible in some cases that web.config is not formatted correctly. In that case you have to go through it line by line before will work. Often, rewrite rules are the culprit here.
How to send string from one activity to another?
You can use intents, which are messages sent between activities. In a intent you can put all sort of data, String, int, etc.
In your case, in activity2
, before going to activity1
, you will store a String message this way :
Intent intent = new Intent(activity2.this, activity1.class);
intent.putExtra("message", message);
startActivity(intent);
In activity1
, in onCreate()
, you can get the String
message by retrieving a Bundle
(which contains all the messages sent by the calling activity) and call getString()
on it :
Bundle bundle = getIntent().getExtras();
String message = bundle.getString("message");
Then you can set the text in the TextView
:
TextView txtView = (TextView) findViewById(R.id.your_resource_textview);
txtView.setText(message);
Hope this helps !
resize font to fit in a div (on one line)
I understand that this question seems to have been answered fairly thoroughly, but there were some instances where solutions here would may cause other issues. For example, tkahn's library looked to be very useful, but it changed the display of the element it was attached to, which could prove to be a problem. In my case, it prevented me from centering the text both vertically and horizontally. After some messing around and experimenting, I have come up with a simple method involving jQuery to fit the text on one line without needing to modify any attributes of the parent element. Note that in this code, I have used Robert Koritnik's suggestion for optimizing the while loop. To use this code, simply add the "font_fix" class to any divs containing text needing to be fit to it in one line. For a header, this may require an extra div around the header. Then, either call this function once for a fixed size div, or set it to a resize and/or orientation listener for varying sizes.
function fixFontSize(minimumSize){
var x = document.getElementsByClassName("font_fix");
for(var i = 0; i < x.length; i++){
x[i].innerHTML = '<div class="font_fix_inner" style="white-space: nowrap; display: inline-block;">' + x[i].innerHTML + '</div>';
var y = x[i].getElementsByClassName("font_fix_inner")[0];
var size = parseInt($("#" + x[i].id).css("font-size"));
size *= x[i].clientWidth / y.clientWidth;
while(y.clientWidth > x[i].clientWidth){
size--;
if(size <= minimumSize){
size = minimumSize;
y.style.maxWidth = "100%";
y.style.overflow = "hidden";
y.style.textOverflow = "ellipsis";
$("#" + x[i].id).css("font-size", size + "px");
break;
}
$("#" + x[i].id).css("font-size", size + "px");
}
}
}
Now, I've added an additional case where the text is chopped off if it gets too small (below the minimum threshold passed into the function) for convenience. Another thing that happens once that threshold is reached that may or may not be desired is the changing of the max width to 100%. This should be changed for each user's scenario. Finally, the whole purpose of posting this answer as an alternate is for its abilities to center the content within the parent div. That can be easily done by adding css attributes to the inner div class as follows:
.font_fix_inner {
position: relative;
float: center;
top: 50%;
-webkit-transform: translateY(-50%);
transform: translateY(-50%);
}
Hope this helped someone!
Radio buttons and label to display in same line
I wasn't able to reproduce your problem in Google Chrome 4.0, IE8, or Firefox 3.5 using that code. The label and radio button stayed on the same line.
Try putting them both inside a <p>
tag, or set the radio button to be inline like The Elite Gentleman suggested.
What does $1 mean in Perl?
The number variables are the matches from the last successful match or substitution operator you applied:
my $string = 'abcdefghi';
if ($string =~ /(abc)def(ghi)/) {
print "I found $1 and $2\n";
}
Always test that the match or substitution was successful before using $1
and so on. Otherwise, you might pick up the leftovers from another operation.
Perl regular expressions are documented in perlre.
Close all infowindows in Google Maps API v3
I have a sample of my code that maybe can help. I had set only one infowindow object at global scope. Then use setContent() to set the content before show it.
let map;
let infowindow;
let dataArr = [
{
pos:{lat: -34.397, lng: 150.644},
content: 'First marker'
},
{
pos:{lat: -34.340, lng: 150.415},
content: 'Second marker'
}
];
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
center: {lat: -34.397, lng: 150.644},
zoom: 8
});
// Set infowindow object to global varible
infowindow = new google.maps.InfoWindow();
loadMarker();
}
function loadMarker(){
dataArr.forEach((obj, i)=>{
let marker = new google.maps.Marker({
position: obj.pos,
map: map
});
marker.addListener('click', function() {
infowindow.close()
infowindow.setContent(`<div> ${obj.content} </div>`)
infowindow.open(map, marker);
});
})
}
How do I add a simple jQuery script to WordPress?
Answer from here: https://premium.wpmudev.org/blog/adding-jquery-scripts-wordpress/
Despite the fact WordPress has been around for a while, and the method of adding scripts to themes and plugins has been the same for years, there is still some confusion around how exactly you’re supposed to add scripts. So let’s clear it up.
Since jQuery is still the most commonly used Javascript framework, let’s take a look at how you can add a simple script to your theme or plugin.
jQuery’s Compatibility Mode
Before we start attaching scripts to WordPress, let’s look at jQuery’s compatibility mode. WordPress comes pre-packaged with a copy of jQuery, which you should use with your code. When WordPress’ jQuery is loaded, it uses compatibility mode, which is a mechanism for avoiding conflicts with other language libraries.
What this boils down to is that you can’t use the dollar sign directly as you would in other projects. When writing jQuery for WordPress you need to use jQuery instead. Take a look at the code below to see what I mean:
How to compare two dates to find time difference in SQL Server 2005, date manipulation
Try this in Sql Server
SELECT
start_date as firstdate,end_date as seconddate
,cast(datediff(MI,start_date,end_date)as decimal(10,3)) as minutediff
,cast(cast(cast(datediff(MI,start_date,end_date)as decimal(10,3)) / (24*60) as int ) as varchar(10)) + ' ' + 'Days' + ' '
+ cast(cast((cast(datediff(MI,start_date,end_date)as decimal(10,3)) / (24*60) -
floor(cast(datediff(MI,start_date,end_date)as decimal(10,3)) / (24*60)) ) * 24 as int) as varchar(10)) + ':'
+ cast( cast(((cast(datediff(MI,start_date,end_date)as decimal(10,3)) / (24*60)
- floor(cast(datediff(MI,start_date,end_date)as decimal(10,3)) / (24*60)))*24
-
cast(floor((cast(datediff(MI,start_date,end_date)as decimal(10,3)) / (24*60)
- floor(cast(datediff(MI,start_date,end_date)as decimal(10,3)) / (24*60)))*24) as decimal)) * 60 as int) as varchar(10))
FROM [AdventureWorks2012].dbo.learndate
Remove Item from ArrayList
In this specific case, you should remove the elements in descending order. First index 5
, then 3
, then 1
. This will remove the elements from the list without undesirable side effects.
for (int j = i.length-1; j >= 0; j--) {
list.remove(i[j]);
}
How to hide image broken Icon using only CSS/HTML?
Since 2005, Mozilla browsers such as Firefox have supported the non-standard :-moz-broken
CSS pseudo-class that can accomplish exactly this request:
_x000D_
_x000D_
td {_x000D_
min-width:64px; /* for display purposes so you can see the empty cell */_x000D_
}_x000D_
_x000D_
img[alt]:-moz-broken {_x000D_
display:none;_x000D_
}
_x000D_
<table border="1"><tr><td>_x000D_
<img src="error">_x000D_
</td><td>_x000D_
<img src="broken" alt="A broken image">_x000D_
</td><td>_x000D_
<img src="https://images-na.ssl-images-amazon.com/images/I/218eLEn0fuL.png"_x000D_
alt="A bird" style="width: 120px">_x000D_
</td></tr></table>
_x000D_
_x000D_
_x000D_
img[alt]::before
also works in Firefox 64 (though once upon a time it was img[alt]::after
so this is not reliable). I can't get either of those to work in Chrome 71.
How to exclude property from Json Serialization
If you are using Json.Net attribute [JsonIgnore]
will simply ignore the field/property while serializing or deserialising.
public class Car
{
// included in JSON
public string Model { get; set; }
public DateTime Year { get; set; }
public List<string> Features { get; set; }
// ignored
[JsonIgnore]
public DateTime LastModified { get; set; }
}
Or you can use DataContract and DataMember attribute to selectively serialize/deserialize properties/fields.
[DataContract]
public class Computer
{
// included in JSON
[DataMember]
public string Name { get; set; }
[DataMember]
public decimal SalePrice { get; set; }
// ignored
public string Manufacture { get; set; }
public int StockCount { get; set; }
public decimal WholeSalePrice { get; set; }
public DateTime NextShipmentDate { get; set; }
}
Refer http://james.newtonking.com/archive/2009/10/23/efficient-json-with-json-net-reducing-serialized-json-size for more details
What is the purpose of a self executing function in javascript?
Here's a solid example of how a self invoking anonymous function could be useful.
for( var i = 0; i < 10; i++ ) {
setTimeout(function(){
console.log(i)
})
}
Output: 10, 10, 10, 10, 10...
for( var i = 0; i < 10; i++ ) {
(function(num){
setTimeout(function(){
console.log(num)
})
})(i)
}
Output: 0, 1, 2, 3, 4...
TSQL PIVOT MULTIPLE COLUMNS
Since you want to pivot multiple columns of data, I would first suggest unpivoting the result
, score
and grade
columns so you don't have multiple columns but you will have multiple rows.
Depending on your version of SQL Server you can use the UNPIVOT function or CROSS APPLY. The syntax to unpivot the data will be similar to:
select ratio, col, value
from GRAND_TOTALS
cross apply
(
select 'result', cast(result as varchar(10)) union all
select 'score', cast(score as varchar(10)) union all
select 'grade', grade
) c(col, value)
See SQL Fiddle with Demo. Once the data has been unpivoted, then you can apply the PIVOT function:
select ratio = col,
[current ratio], [gearing ratio], [performance ratio], total
from
(
select ratio, col, value
from GRAND_TOTALS
cross apply
(
select 'result', cast(result as varchar(10)) union all
select 'score', cast(score as varchar(10)) union all
select 'grade', grade
) c(col, value)
) d
pivot
(
max(value)
for ratio in ([current ratio], [gearing ratio], [performance ratio], total)
) piv;
See SQL Fiddle with Demo. This will give you the result:
| RATIO | CURRENT RATIO | GEARING RATIO | PERFORMANCE RATIO | TOTAL |
|--------|---------------|---------------|-------------------|-----------|
| grade | Good | Good | Satisfactory | Good |
| result | 1.29400 | 0.33840 | 0.04270 | (null) |
| score | 60.00000 | 70.00000 | 50.00000 | 180.00000 |
This Handler class should be static or leaks might occur: IncomingHandler
This way worked well for me, keeps code clean by keeping where you handle the message in its own inner class.
The handler you wish to use
Handler mIncomingHandler = new Handler(new IncomingHandlerCallback());
The inner class
class IncomingHandlerCallback implements Handler.Callback{
@Override
public boolean handleMessage(Message message) {
// Handle message code
return true;
}
}
How do I combine two data-frames based on two columns?
See the documentation on ?merge
, which states:
By default the data frames are merged on the columns with names they both have,
but separate specifications of the columns can be given by by.x and by.y.
This clearly implies that merge
will merge data frames based on more than one column. From the final example given in the documentation:
x <- data.frame(k1=c(NA,NA,3,4,5), k2=c(1,NA,NA,4,5), data=1:5)
y <- data.frame(k1=c(NA,2,NA,4,5), k2=c(NA,NA,3,4,5), data=1:5)
merge(x, y, by=c("k1","k2")) # NA's match
This example was meant to demonstrate the use of incomparables
, but it illustrates merging using multiple columns as well. You can also specify separate columns in each of x
and y
using by.x
and by.y
.
Error: select command denied to user '<userid>'@'<ip-address>' for table '<table-name>'
select command denied to user ''@'' for table ''
This problem is a basically generated after join condition are wrong database name in your join query. So please check the your select query in join table name after database.
Then solve it for example its correct ans ware
string g = " SELECT `emptable`.`image` , `applyleave`.`id` , `applyleave`.`empid` , `applyleave`.`empname` , `applyleave`.`dateapply` , `applyleave`.`leavename` , `applyleave`.`fromdate` , `applyleave`.`todate` , `applyleave`.`resion` , `applyleave`.`contact` , `applyleave`.`leavestatus` , `applyleave`.`username` , `applyleave`.`noday` FROM `DataEMP_ems`.`applyleave` INNER JOIN `DataEMP_ems`.`emptable` ON ( `applyleave`.`empid` = `emptable`.`empid` ) WHERE ( `applyleave`.`leavestatus` = 'panding' ) ";
The join table is imputable
and applyleave
on the same database but online database name is diffrent then given error on this problem.
Appending the same string to a list of strings in Python
Running the following experiment the pythonic way:
[s + mystring for s in mylist]
seems to be ~35% faster than the obvious use of a for loop like this:
i = 0
for s in mylist:
mylist[i] = s+mystring
i = i + 1
Experiment
import random
import string
import time
mystring = '/test/'
l = []
ref_list = []
for i in xrange( 10**6 ):
ref_list.append( ''.join(random.choice(string.ascii_lowercase) for i in range(10)) )
for numOfElements in [5, 10, 15 ]:
l = ref_list*numOfElements
print 'Number of elements:', len(l)
l1 = list( l )
l2 = list( l )
# Method A
start_time = time.time()
l2 = [s + mystring for s in l2]
stop_time = time.time()
dt1 = stop_time - start_time
del l2
#~ print "Method A: %s seconds" % (dt1)
# Method B
start_time = time.time()
i = 0
for s in l1:
l1[i] = s+mystring
i = i + 1
stop_time = time.time()
dt0 = stop_time - start_time
del l1
del l
#~ print "Method B: %s seconds" % (dt0)
print 'Method A is %.1f%% faster than Method B' % ((1 - dt1/dt0)*100)
Results
Number of elements: 5000000
Method A is 38.4% faster than Method B
Number of elements: 10000000
Method A is 33.8% faster than Method B
Number of elements: 15000000
Method A is 35.5% faster than Method B
Model summary in pytorch
This will show a model's weights and parameters (but not output shape).
from torch.nn.modules.module import _addindent
import torch
import numpy as np
def torch_summarize(model, show_weights=True, show_parameters=True):
"""Summarizes torch model by showing trainable parameters and weights."""
tmpstr = model.__class__.__name__ + ' (\n'
for key, module in model._modules.items():
# if it contains layers let call it recursively to get params and weights
if type(module) in [
torch.nn.modules.container.Container,
torch.nn.modules.container.Sequential
]:
modstr = torch_summarize(module)
else:
modstr = module.__repr__()
modstr = _addindent(modstr, 2)
params = sum([np.prod(p.size()) for p in module.parameters()])
weights = tuple([tuple(p.size()) for p in module.parameters()])
tmpstr += ' (' + key + '): ' + modstr
if show_weights:
tmpstr += ', weights={}'.format(weights)
if show_parameters:
tmpstr += ', parameters={}'.format(params)
tmpstr += '\n'
tmpstr = tmpstr + ')'
return tmpstr
# Test
import torchvision.models as models
model = models.alexnet()
print(torch_summarize(model))
# # Output
# AlexNet (
# (features): Sequential (
# (0): Conv2d(3, 64, kernel_size=(11, 11), stride=(4, 4), padding=(2, 2)), weights=((64, 3, 11, 11), (64,)), parameters=23296
# (1): ReLU (inplace), weights=(), parameters=0
# (2): MaxPool2d (size=(3, 3), stride=(2, 2), dilation=(1, 1)), weights=(), parameters=0
# (3): Conv2d(64, 192, kernel_size=(5, 5), stride=(1, 1), padding=(2, 2)), weights=((192, 64, 5, 5), (192,)), parameters=307392
# (4): ReLU (inplace), weights=(), parameters=0
# (5): MaxPool2d (size=(3, 3), stride=(2, 2), dilation=(1, 1)), weights=(), parameters=0
# (6): Conv2d(192, 384, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1)), weights=((384, 192, 3, 3), (384,)), parameters=663936
# (7): ReLU (inplace), weights=(), parameters=0
# (8): Conv2d(384, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1)), weights=((256, 384, 3, 3), (256,)), parameters=884992
# (9): ReLU (inplace), weights=(), parameters=0
# (10): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1)), weights=((256, 256, 3, 3), (256,)), parameters=590080
# (11): ReLU (inplace), weights=(), parameters=0
# (12): MaxPool2d (size=(3, 3), stride=(2, 2), dilation=(1, 1)), weights=(), parameters=0
# ), weights=((64, 3, 11, 11), (64,), (192, 64, 5, 5), (192,), (384, 192, 3, 3), (384,), (256, 384, 3, 3), (256,), (256, 256, 3, 3), (256,)), parameters=2469696
# (classifier): Sequential (
# (0): Dropout (p = 0.5), weights=(), parameters=0
# (1): Linear (9216 -> 4096), weights=((4096, 9216), (4096,)), parameters=37752832
# (2): ReLU (inplace), weights=(), parameters=0
# (3): Dropout (p = 0.5), weights=(), parameters=0
# (4): Linear (4096 -> 4096), weights=((4096, 4096), (4096,)), parameters=16781312
# (5): ReLU (inplace), weights=(), parameters=0
# (6): Linear (4096 -> 1000), weights=((1000, 4096), (1000,)), parameters=4097000
# ), weights=((4096, 9216), (4096,), (4096, 4096), (4096,), (1000, 4096), (1000,)), parameters=58631144
# )
Edit: isaykatsman has a pytorch PR to add a model.summary()
that is exactly like keras https://github.com/pytorch/pytorch/pull/3043/files
jQuery - Increase the value of a counter when a button is clicked
Several of the suggestions above use global variables. This is not a good solution for the problem. The count is specific to one element, and you can use jQuery's data
function to bind an item of data to an element:
$('#counter').data('count', 0);
$('#update').click(function(){
$('#counter').html(function(){
var $this = $(this),
count = $this.data('count') + 1;
$this.data('count', count);
return count;
});
});
Note also that this uses the callback syntax of html
to make the code more fluent and fast.
How to programmatically move, copy and delete files and directories on SD?
Xamarin Android
public static bool MoveFile(string CurrentFilePath, string NewFilePath)
{
try
{
using (var f = new File(CurrentFilePath))
using (var i = new FileInputStream(f))
using (var o = new FileOutputStream(NewFilePath))
{
i.Channel.TransferTo(0, i.Channel.Size(), o.Channel);
f.Delete();
}
return true;
}
catch { return false; }
}
public static bool CopyFile(string CurrentFilePath, string NewFilePath)
{
try
{
using (var i = new FileInputStream(CurrentFilePath))
using (var o = new FileOutputStream(NewFilePath))
i.Channel.TransferTo(0, i.Channel.Size(), o.Channel);
return true;
}
catch { return false; }
}
public static bool DeleteFile(string FilePath)
{
try
{
using (var file = new File(FilePath))
file.Delete();
return true;
}
catch { return false; }
}
VBA: How to display an error message just like the standard error message which has a "Debug" button?
For Me I just wanted to see the error in my VBA application so in the function I created the below code..
Function Database_FileRpt
'-------------------------
On Error GoTo CleanFail
'-------------------------
'
' Create_DailyReport_Action and code
CleanFail:
'*************************************
MsgBox "********************" _
& vbCrLf & "Err.Number: " & Err.Number _
& vbCrLf & "Err.Description: " & Err.Description _
& vbCrLf & "Err.Source: " & Err.Source _
& vbCrLf & "********************" _
& vbCrLf & "...Exiting VBA Function: Database_FileRpt" _
& vbCrLf & "...Excel VBA Program Reset." _
, , "VBA Error Exception Raised!"
*************************************
' Note that the next line will reset the error object to 0, the variables
above are used to remember the values
' so that the same error can be re-raised
Err.Clear
' *************************************
Resume CleanExit
CleanExit:
'cleanup code , if any, goes here. runs regardless of error state.
Exit Function ' SUB or Function
End Function ' end of Database_FileRpt
' ------------------
WCF change endpoint address at runtime
We store our URLs in a database and load them at runtime.
public class ServiceClientFactory<TChannel> : ClientBase<TChannel> where TChannel : class
{
public TChannel Create(string url)
{
this.Endpoint.Address = new EndpointAddress(new Uri(url));
return this.Channel;
}
}
Implementation
var client = new ServiceClientFactory<yourServiceChannelInterface>().Create(newUrl);
Difference between webdriver.get() and webdriver.navigate()
They both seems to navigate to the given webpage and quoting @matt answer:
navigate().to()
and get()
do exactly the same thing.
Single-Page Applications are an exception to this.
The difference between these two methods comes not from their behavior, but from the behavior in the way the application works and how browser deal with it.
navigate().to()
navigates to the page by changing the URL like doing forward/backward navigation.
Whereas, get()
refreshes the page to changing the URL.
So, in cases where application domain changes, both the method behaves similarly. That is, page is refreshed in both the cases. But, in single-page applications, while navigate().to()
do not refreshes the page, get()
do.
Moreover, this is the reason browser history is getting lost when get()
is used due to application being refreshed.
Originally answered: https://stackoverflow.com/a/33868976/3619412
How to specify multiple return types using type-hints
Python 3.10 (use |
): Example for a function which takes a single argument that is either an int
or str
and returns either an int
or str
:
def func(arg: int | str) -> int | str:
^^^^^^^^^ ^^^^^^^^^
type of arg return type
Python 3.5 - 3.9 (use typing.Union
):
from typing import Union
def func(arg: Union[int, str]) -> Union[int, str]:
^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^
type of arg return type
For the special case of X | None
you can use Optional[X]
.
Open an html page in default browser with VBA?
You can use the Windows API function ShellExecute
to do so:
Option Explicit
Private Declare Function ShellExecute _
Lib "shell32.dll" Alias "ShellExecuteA" ( _
ByVal hWnd As Long, _
ByVal Operation As String, _
ByVal Filename As String, _
Optional ByVal Parameters As String, _
Optional ByVal Directory As String, _
Optional ByVal WindowStyle As Long = vbMinimizedFocus _
) As Long
Public Sub OpenUrl()
Dim lSuccess As Long
lSuccess = ShellExecute(0, "Open", "www.google.com")
End Sub
Just a short remark concerning security: If the URL comes from user input make sure to strictly validate that input as ShellExecute
would execute any command with the user's permissions, also a format c:
would be executed if the user is an administrator.
Create list of single item repeated N times
Create List of Single Item Repeated n Times in Python
Depending on your use-case, you want to use different techniques with different semantics.
Multiply a list for Immutable items
For immutable items, like None, bools, ints, floats, strings, tuples, or frozensets, you can do it like this:
[e] * 4
Note that this is usually only used with immutable items (strings, tuples, frozensets, ) in the list, because they all point to the same item in the same place in memory. I use this frequently when I have to build a table with a schema of all strings, so that I don't have to give a highly redundant one to one mapping.
schema = ['string'] * len(columns)
Multiply the list where we want the same item repeated
Multiplying a list gives us the same elements over and over. The need for this is rare:
[iter(iterable)] * 4
This is sometimes used to map an iterable into a list of lists:
>>> iterable = range(12)
>>> a_list = [iter(iterable)] * 4
>>> [[next(l) for l in a_list] for i in range(3)]
[[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11]]
We can see that a_list
contains the same range iterator four times:
>>> a_list
[<range_iterator object at 0x7fde73a5da20>, <range_iterator object at 0x7fde73a5da20>, <range_iterator object at 0x7fde73a5da20>, <range_iterator object at 0x7fde73a5da20>]
Mutable items
I've used Python for a long time now, and I have seen very few use-cases where I would do the above with mutable objects.
Instead, to get, say, a mutable empty list, set, or dict, you should do something like this:
list_of_lists = [[] for _ in columns]
The underscore is simply a throwaway variable name in this context.
If you only have the number, that would be:
list_of_lists = [[] for _ in range(4)]
The _
is not really special, but your coding environment style checker will probably complain if you don't intend to use the variable and use any other name.
Caveats for using the immutable method with mutable items:
Beware doing this with mutable objects, when you change one of them, they all change because they're all the same object:
foo = [[]] * 4
foo[0].append('x')
foo now returns:
[['x'], ['x'], ['x'], ['x']]
But with immutable objects, you can make it work because you change the reference, not the object:
>>> l = [0] * 4
>>> l[0] += 1
>>> l
[1, 0, 0, 0]
>>> l = [frozenset()] * 4
>>> l[0] |= set('abc')
>>> l
[frozenset(['a', 'c', 'b']), frozenset([]), frozenset([]), frozenset([])]
But again, mutable objects are no good for this, because in-place operations change the object, not the reference:
l = [set()] * 4
>>> l[0] |= set('abc')
>>> l
[set(['a', 'c', 'b']), set(['a', 'c', 'b']), set(['a', 'c', 'b']), set(['a', 'c', 'b'])]
HTML5 Canvas Resize (Downscale) Image High Quality?
Not the right answer for people who really need to resize the image itself, but just to shrink the file size.
I had a problem with "directly from the camera" pictures, that my customers often uploaded in "uncompressed" JPEG.
Not so well known is, that the canvas supports (in most browsers 2017) to change the quality of JPEG
data=canvas.toDataURL('image/jpeg', .85) # [1..0] default 0.92
With this trick I could reduce 4k x 3k pics with >10Mb to 1 or 2Mb, sure it depends on your needs.
look here
What is the 'dynamic' type in C# 4.0 used for?
Another use case for dynamic
typing is for virtual methods that experience a problem with covariance or contravariance. One such example is the infamous Clone
method that returns an object of the same type as the object it is called on. This problem is not completely solved with a dynamic return because it bypasses static type checking, but at least you don't need to use ugly casts all the time as per when using plain object
. Otherwise to say, the casts become implicit.
public class A
{
// attributes and constructor here
public virtual dynamic Clone()
{
var clone = new A();
// Do more cloning stuff here
return clone;
}
}
public class B : A
{
// more attributes and constructor here
public override dynamic Clone()
{
var clone = new B();
// Do more cloning stuff here
return clone;
}
}
public class Program
{
public static void Main()
{
A a = new A().Clone(); // No cast needed here
B b = new B().Clone(); // and here
// do more stuff with a and b
}
}
How to run TestNG from command line
I had faced same problem because I downloaded TestNG plugin from Eclipse. Here what I did to get the Job done :
After adding TestNG to your project library create one folder in your Project names as lib ( name can be anything ) :
Go to "C:\Program Files\Eclipse\eclipse-java-mars-R-win32-x86_64\eclipse\plugins" location and copy com.beust.jcommander_1.72.0.jar and org.testng_6.14.2.r20180216145.jar file to created folder (lib).
Note : Files are testng.jar and jcommander.jar
- Now Launch CMD, and navigate to your project directory and then type :
Java -cp C:\Users\User123\TestNG\lib*;C:\Users\User123\TestNG\bin org.testng.TestNG testng.xml
That's it !
Let me know if you have any more concerns.
DateTimePicker: pick both date and time
I'm afraid the DateTimePicker control doesn't have the ability to do those things. It's a pretty basic (and frustrating!) control. Your best option may be to find a third-party control that does what you want.
For the option of typing the date and time manually, you could build a custom component with a TextBox/DateTimePicker combination to accomplish this, and it might work reasonably well, if third-party controls are not an option.
Depend on a branch or tag using a git URL in a package.json?
On latest version of NPM you can just do:
npm install gitAuthor/gitRepo#tag
If the repo is a valid NPM package it will be auto-aliased in package.json as:
{
"NPMPackageName": "gitAuthor/gitRepo#tag"
}
If you could add this to @justingordon 's answer there is no need for manual aliasing now !
Changing upload_max_filesize on PHP
You can't use shorthand notation to set configuration values outside of PHP.ini. I assume it's falling back to 2MB as the compiled default when confronted with a bad value.
On the other hand, I don't think upload_max_filesize
could be set using ini_set()
. The "official" list states that it is PHP_INI_PERDIR
.
How to get thread id from a thread pool?
If you are using logging then thread names will be helpful.
A thread factory helps with this:
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
public class Main {
static Logger LOG = LoggerFactory.getLogger(Main.class);
static class MyTask implements Runnable {
public void run() {
LOG.info("A pool thread is doing this task");
}
}
public static void main(String[] args) {
ExecutorService taskExecutor = Executors.newFixedThreadPool(5, new MyThreadFactory());
taskExecutor.execute(new MyTask());
taskExecutor.shutdown();
}
}
class MyThreadFactory implements ThreadFactory {
private int counter;
public Thread newThread(Runnable r) {
return new Thread(r, "My thread # " + counter++);
}
}
Output:
[ My thread # 0] Main INFO A pool thread is doing this task
How to create a new variable in a data.frame based on a condition?
If you have a very limited number of levels, you could try converting y
into factor and change its levels.
> xy <- data.frame(x = c(1, 2, 4), y = c(1, 4, 5))
> xy$w <- as.factor(xy$y)
> levels(xy$w) <- c("good", "fair", "bad")
> xy
x y w
1 1 1 good
2 2 4 fair
3 4 5 bad
checking memory_limit in PHP
very old post. but i'll just leave this here:
/* converts a number with byte unit (B / K / M / G) into an integer */
function unitToInt($s)
{
return (int)preg_replace_callback('/(\-?\d+)(.?)/', function ($m) {
return $m[1] * pow(1024, strpos('BKMG', $m[2]));
}, strtoupper($s));
}
$mem_limit = unitToInt(ini_get('memory_limit'));
DirectX SDK (June 2010) Installation Problems: Error Code S1023
I had the same problem and for me it was because the vc2010 redist x86 was too recent.
Check your temp folder (C:\Users\\AppData\Local\Temp) for the most recent file named
Microsoft Visual C++ 2010 x64 Redistributable Setup_20110608_xxx.html ##
and check if you have the following error
Installation Blockers:
A newer version of Microsoft Visual C++ 2010 Redistributable has been detected on the machine.
Final Result: Installation failed with error code: (0x000013EC), "A StopBlock was hit or a System >Requirement was not met." (Elapsed time: 0 00:00:00).
then go to Control Panel>Program & Features and uninstall all the
Microsoft Visual C++ 2010 x86/x64 redistributable - 10.0.(number over 30319)
After successful installation of DXSDK, simply run Windows Update and it will update the redistributables back to the latest version.
How do you run a .exe with parameters using vba's shell()?
Here are some examples of how to use Shell in VBA.
Open stackoverflow in Chrome.
Call Shell("C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" & _
" -url" & " " & "www.stackoverflow.com",vbMaximizedFocus)
Open some text file.
Call Shell ("notepad C:\Users\user\Desktop\temp\TEST.txt")
Open some application.
Call Shell("C:\Temp\TestApplication.exe",vbNormalFocus)
Hope this helps!
Handling InterruptedException in Java
What are you trying to do?
The InterruptedException
is thrown when a thread is waiting or sleeping and another thread interrupts it using the interrupt
method in class Thread
. So if you catch this exception, it means that the thread has been interrupted. Usually there is no point in calling Thread.currentThread().interrupt();
again, unless you want to check the "interrupted" status of the thread from somewhere else.
Regarding your other option of throwing a RuntimeException
, it does not seem a very wise thing to do (who will catch this? how will it be handled?) but it is difficult to tell more without additional information.
How to create a jQuery plugin with methods?
jQuery has made this a lot easier with the introduction of the Widget Factory.
Example:
$.widget( "myNamespace.myPlugin", {
options: {
// Default options
},
_create: function() {
// Initialization logic here
},
// Create a public method.
myPublicMethod: function( argument ) {
// ...
},
// Create a private method.
_myPrivateMethod: function( argument ) {
// ...
}
});
Initialization:
$('#my-element').myPlugin();
$('#my-element').myPlugin( {defaultValue:10} );
Method calling:
$('#my-element').myPlugin('myPublicMethod', 20);
(This is how the jQuery UI library is built.)
iTunes Connect: How to choose a good SKU?
SKU can also refer to a unique identifier or code that refers to the particular stock keeping unit. These codes are not regulated or standardized. When a company receives items from a vendor, it has a choice of maintaining the vendor's SKU or creating its own.[2] This makes them distinct from Global Trade Item Number (GTIN), which are standard, global, tracking units. Universal Product Code (UPC), International Article Number (EAN), and Australian Product Number (APN) are special cases of GTINs.
Is Ruby pass by reference or by value?
In traditional terminology, Ruby is strictly pass-by-value. But that's not really what you're asking here.
Ruby doesn't have any concept of a pure, non-reference value, so you certainly can't pass one to a method. Variables are always references to objects. In order to get an object that won't change out from under you, you need to dup or clone the object you're passed, thus giving an object that nobody else has a reference to. (Even this isn't bulletproof, though — both of the standard cloning methods do a shallow copy, so the instance variables of the clone still point to the same objects that the originals did. If the objects referenced by the ivars mutate, that will still show up in the copy, since it's referencing the same objects.)
SyntaxError: missing ; before statement
I got this error, hope this will help someone:
const firstName = 'Joe';
const lastName = 'Blogs';
const wholeName = firstName + ' ' lastName + '.';
The problem was that I was missing a plus (+) between the empty space and lastName. This is a super simplified example: I was concatenating about 9 different parts so it was hard to spot the error.
Summa summarum: if you get "SyntaxError: missing ; before statement", don't look at what is wrong with the the semicolon (;) symbols in your code, look for an error in syntax on that line.
Using .Select and .Where in a single LINQ statement
Did you add the Select()
after the Where()
or before?
You should add it after, because of the concurrency logic:
1 Take the entire table
2 Filter it accordingly
3 Select only the ID's
4 Make them distinct.
If you do a Select first, the Where clause can only contain the ID attribute because all other attributes have already been edited out.
Update: For clarity, this order of operators should work:
db.Items.Where(x=> x.userid == user_ID).Select(x=>x.Id).Distinct();
Probably want to add a .toList()
at the end but that's optional :)
How do I access properties of a javascript object if I don't know the names?
Old versions of JavaScript (< ES5) require using a for..in
loop:
for (var key in data) {
if (data.hasOwnProperty(key)) {
// do something with key
}
}
ES5 introduces Object.keys and Array#forEach which makes this a little easier:
var data = { foo: 'bar', baz: 'quux' };
Object.keys(data); // ['foo', 'baz']
Object.keys(data).map(function(key){ return data[key] }) // ['bar', 'quux']
Object.keys(data).forEach(function (key) {
// do something with data[key]
});
ES2017 introduces Object.values
and Object.entries
.
Object.values(data) // ['bar', 'quux']
Object.entries(data) // [['foo', 'bar'], ['baz', 'quux']]
Using Font Awesome icon for bullet points, with a single list item element
There's an example of how to use Font Awesome alongside an unordered list on their examples page.
<ul class="icons">
<li><i class="icon-ok"></i> Lists</li>
<li><i class="icon-ok"></i> Buttons</li>
<li><i class="icon-ok"></i> Button groups</li>
<li><i class="icon-ok"></i> Navigation</li>
<li><i class="icon-ok"></i> Prepended form inputs</li>
</ul>
If you can't find it working after trying this code then you're not including the library correctly. According to their website, you should include the libraries as such:
<link rel="stylesheet" href="../css/bootstrap.css">
<link rel="stylesheet" href="../css/font-awesome.css">
Also check out the whimsical Chris Coyier's post on icon fonts on his website CSS Tricks.
Here's a screencast by him as well talking about how to create your own icon font-face.
Could not calculate build plan: Plugin org.apache.maven.plugins:maven-jar-plugin:2.3.2 or one of its dependencies could not be resolved
I had same issue while creating new spring project in eclipse using Maven.
The main reason for this issue is that the proxy settings was not there.
I used the following approach to reslove it:
1) create settings.xml with the below content
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
https://maven.apache.org/xsd/settings-1.0.0.xsd">
<localRepository/>
<interactiveMode/>
<usePluginRegistry/>
<offline/>
<pluginGroups/>
<servers/>
<mirrors/>
<proxies>
<proxy>
<active>true</active>
<protocol>http</protocol>
<host>Your proxy</host>
<port>Your port</port>
</proxy>
</proxies>
<profiles/>
<activeProfiles/>
</settings>
2) Save the settings.xml file under local C:\Users\<<your user account>>\.m2
3) Then Right click project pom.XML in eclipse and select "Update Project". It always give precedence to settings.XML
How to check if two arrays are equal with JavaScript?
jQuery has such method for deep recursive comparison.
A homegrown general purpose strict equality check could look as follows:
function deepEquals(obj1, obj2, parents1, parents2) {
"use strict";
var i;
// compare null and undefined
if (obj1 === undefined || obj2 === undefined ||
obj1 === null || obj2 === null) {
return obj1 === obj2;
}
// compare primitives
if (typeof (obj1) !== 'object' || typeof (obj2) !== 'object') {
return obj1.valueOf() === obj2.valueOf();
}
// if objects are of different types or lengths they can't be equal
if (obj1.constructor !== obj2.constructor || (obj1.length !== undefined && obj1.length !== obj2.length)) {
return false;
}
// iterate the objects
for (i in obj1) {
// build the parents list for object on the left (obj1)
if (parents1 === undefined) parents1 = [];
if (obj1.constructor === Object) parents1.push(obj1);
// build the parents list for object on the right (obj2)
if (parents2 === undefined) parents2 = [];
if (obj2.constructor === Object) parents2.push(obj2);
// walk through object properties
if (obj1.propertyIsEnumerable(i)) {
if (obj2.propertyIsEnumerable(i)) {
// if object at i was met while going down here
// it's a self reference
if ((obj1[i].constructor === Object && parents1.indexOf(obj1[i]) >= 0) || (obj2[i].constructor === Object && parents2.indexOf(obj2[i]) >= 0)) {
if (obj1[i] !== obj2[i]) {
return false;
}
continue;
}
// it's not a self reference so we are here
if (!deepEquals(obj1[i], obj2[i], parents1, parents2)) {
return false;
}
} else {
// obj2[i] does not exist
return false;
}
}
}
return true;
};
Tests:
// message is displayed on failure
// clean console === all tests passed
function assertTrue(cond, msg) {
if (!cond) {
console.log(msg);
}
}
var a = 'sdf',
b = 'sdf';
assertTrue(deepEquals(b, a), 'Strings are equal.');
b = 'dfs';
assertTrue(!deepEquals(b, a), 'Strings are not equal.');
a = 9;
b = 9;
assertTrue(deepEquals(b, a), 'Numbers are equal.');
b = 3;
assertTrue(!deepEquals(b, a), 'Numbers are not equal.');
a = false;
b = false;
assertTrue(deepEquals(b, a), 'Booleans are equal.');
b = true;
assertTrue(!deepEquals(b, a), 'Booleans are not equal.');
a = null;
assertTrue(!deepEquals(b, a), 'Boolean is not equal to null.');
a = function () {
return true;
};
assertTrue(deepEquals(
[
[1, 1, 1],
[2, 'asdf', [1, a]],
[3, {
'a': 1.0
},
true]
],
[
[1, 1, 1],
[2, 'asdf', [1, a]],
[3, {
'a': 1.0
},
true]
]), 'Arrays are equal.');
assertTrue(!deepEquals(
[
[1, 1, 1],
[2, 'asdf', [1, a]],
[3, {
'a': 1.0
},
true]
],
[
[1, 1, 1],
[2, 'asdf', [1, a]],
[3, {
'a': '1'
},
true]
]), 'Arrays are not equal.');
a = {
prop: 'val'
};
a.self = a;
b = {
prop: 'val'
};
b.self = a;
assertTrue(deepEquals(b, a), 'Immediate self referencing objects are equal.');
a.prop = 'shmal';
assertTrue(!deepEquals(b, a), 'Immediate self referencing objects are not equal.');
a = {
prop: 'val',
inside: {}
};
a.inside.self = a;
b = {
prop: 'val',
inside: {}
};
b.inside.self = a;
assertTrue(deepEquals(b, a), 'Deep self referencing objects are equal.');
b.inside.self = b;
assertTrue(!deepEquals(b, a), 'Deep self referencing objects are not equeal. Not the same instance.');
b.inside.self = {foo: 'bar'};
assertTrue(!deepEquals(b, a), 'Deep self referencing objects are not equal. Completely different object.');
a = {};
b = {};
a.self = a;
b.self = {};
assertTrue(!deepEquals(b, a), 'Empty object and self reference of an empty object.');
Node Express sending image files as API response
a proper solution with streams and error handling is below:
const fs = require('fs')
const stream = require('stream')
app.get('/report/:chart_id/:user_id',(req, res) => {
const r = fs.createReadStream('path to file') // or any other way to get a readable stream
const ps = new stream.PassThrough() // <---- this makes a trick with stream error handling
stream.pipeline(
r,
ps, // <---- this makes a trick with stream error handling
(err) => {
if (err) {
console.log(err) // No such file or any other kind of error
return res.sendStatus(400);
}
})
ps.pipe(res) // <---- this makes a trick with stream error handling
})
with Node older then 10 you will need to use pump instead of pipeline.
What is the difference between ports 465 and 587?
Port 465:
IANA has reassigned a new service to this port, and it should no longer be used for SMTP communications.
However, because it was once recognized by IANA as valid, there may be legacy systems that are only capable of using this connection method. Typically, you will use this port only if your application demands it. A quick Google search, and you'll find many consumer ISP articles that suggest port 465 as the recommended setup. Hopefully this ends soon! It is not RFC compliant.
Port 587:
This is the default mail submission port. When a mail client or server is submitting an email to be routed by a proper mail server, it should always use this port.
Everyone should consider using this port as default, unless you're explicitly blocked by your upstream network or hosting provider. This port, coupled with TLS encryption, will ensure that email is submitted securely and following the guidelines set out by the IETF.
Port 25:
This port continues to be used primarily for SMTP relaying. SMTP relaying is the transmittal of email from email server to email server.
In most cases, modern SMTP clients (Outlook, Mail, Thunderbird, etc) shouldn't use this port. It is traditionally blocked, by residential ISPs and Cloud Hosting Providers, to curb the amount of spam that is relayed from compromised computers or servers. Unless you're specifically managing a mail server, you should have no traffic traversing this port on your computer or server.
PHP save image file
Note: you should use the accepted answer if possible. It's better than mine.
It's quite easy with the GD library.
It's built in usually, you probably have it (use phpinfo()
to check)
$image = imagecreatefromjpeg("http://images.websnapr.com/?size=size&key=Y64Q44QLt12u&url=http://google.com");
imagejpeg($image, "folder/file.jpg");
The above answer is better (faster) for most situations, but with GD you can also modify it in some form (cropping for example).
$image = imagecreatefromjpeg("http://images.websnapr.com/?size=size&key=Y64Q44QLt12u&url=http://google.com");
imagecopy($image, $image, 0, 140, 0, 0, imagesx($image), imagesy($image));
imagejpeg($image, "folder/file.jpg");
This only works if allow_url_fopen
is true
(it is by default)
SQL update trigger only when column is modified
One should check if QtyToRepair
is updated at first.
ALTER TRIGGER [dbo].[tr_SCHEDULE_Modified]
ON [dbo].[SCHEDULE]
AFTER UPDATE
AS
BEGIN
SET NOCOUNT ON;
IF UPDATE (QtyToRepair)
BEGIN
UPDATE SCHEDULE
SET modified = GETDATE()
, ModifiedUser = SUSER_NAME()
, ModifiedHost = HOST_NAME()
FROM SCHEDULE S INNER JOIN Inserted I
ON S.OrderNo = I.OrderNo and S.PartNumber = I.PartNumber
WHERE S.QtyToRepair <> I.QtyToRepair
END
END
Problems using Maven and SSL behind proxy
ymptom: After configuring Nexus to serve SSL maven builds fail with "peer not authenticated" or "PKIX path building failed".
This is usually caused by using a self signed SSL certificate on Nexus. Java does not consider these to be a valid certificates, and will not allow connecting to server's running them by default.
You have a few choices here to fix this:
- Add the public certificate of the Nexus server to the trust store of the Java running Maven
- Get the certificate on Nexus signed by a root certificate authority such as Verisign
- Tell Maven to accept the certificate even though it isn't signed
For option 1 you can use the keytool command and follow the steps in the below article.
Explicitly Trusting a Self-Signed or Private Certificate in a Java Based Client
For option 3, invoke Maven with "-Dmaven.wagon.http.ssl.insecure=true". If the host name configured in the certificate doesn't match the host name Nexus is running on you may also need to add "-Dmaven.wagon.http.ssl.allowall=true".
Note: These additional parameters are initialized in static initializers, so they have to be passed in via the MAVEN_OPTS environment variable. Passing them on the command line to Maven will not work.
See here for more information:
http://maven.apache.org/wagon/wagon-providers/wagon-http/
How to get year/month/day from a date object?
var dt = new Date();
dt.getFullYear() + "/" + (dt.getMonth() + 1) + "/" + dt.getDate();
Since month index are 0 based you have to increment it by 1.
Edit
For a complete list of date object functions see
Date
getMonth()
Returns the month (0-11) in the specified date according to local time.
getUTCMonth()
Returns the month (0-11) in the specified date according to universal time.
Total width of element (including padding and border) in jQuery
same browsers may return string for border width, in this parseInt will return NaN
so make sure you parse value to int properly.
var getInt = function (string) {
if (typeof string == "undefined" || string == "")
return 0;
var tempInt = parseInt(string);
if (!(tempInt <= 0 || tempInt > 0))
return 0;
return tempInt;
}
var liWidth = $(this).width();
liWidth += getInt($(this).css("padding-left"));
liWidth += getInt($(this).css("padding-right"));
liWidth += getInt($(this).css("border-left-width"));
liWidth += getInt($(this).css("border-right-width"));
Animate change of view background color on Android
The documentation on XML powered animations is horrible. I've searched around hours just to animate the background color of a button when pressing... The sad thing is that the animation is only one attribute away: You can use exitFadeDuration
in the selector
:
<selector xmlns:android="http://schemas.android.com/apk/res/android"
android:exitFadeDuration="200">
<item android:state_pressed="true">
<shape android:tint="#3F51B5" />
</item>
<item>
<shape android:tint="#F44336" />
</item>
</selector>
Then just use it as background
for your view. No Java/Kotlin code needed.
Python circular importing?
I was able to import the module within the function (only) that would require the objects from this module:
def my_func():
import Foo
foo_instance = Foo()
MySQL JOIN the most recent row only?
If you are working with heavy queries, you better move the request for the latest row in the where clause. It is a lot faster and looks cleaner.
SELECT c.*,
FROM client AS c
LEFT JOIN client_calling_history AS cch ON cch.client_id = c.client_id
WHERE
cch.cchid = (
SELECT MAX(cchid)
FROM client_calling_history
WHERE client_id = c.client_id AND cal_event_id = c.cal_event_id
)
How do I get an empty array of any size in python?
If you (or other searchers of this question) were actually interested in creating a contiguous array to fill with integers, consider bytearray and memoryivew:
# cast() is available starting Python 3.3
size = 10**6
ints = memoryview(bytearray(size)).cast('i')
ints.contiguous, ints.itemsize, ints.shape
# (True, 4, (250000,))
ints[0]
# 0
ints[0] = 16
ints[0]
# 16
How to implement linear interpolation?
def interpolate(x1: float, x2: float, y1: float, y2: float, x: float):
"""Perform linear interpolation for x between (x1,y1) and (x2,y2) """
return ((y2 - y1) * x + x2 * y1 - x1 * y2) / (x2 - x1)
Oracle error : ORA-00905: Missing keyword
Unless there is a single row in the ASSIGNMENT
table and ASSIGNMENT_20081120
is a local PL/SQL variable of type ASSIGNMENT%ROWTYPE
, this is not what you want.
Assuming you are trying to create a new table and copy the existing data to that new table
CREATE TABLE assignment_20081120
AS
SELECT *
FROM assignment
How to do joins in LINQ on multiple fields in single join
Using the join operator you can only perform equijoins. Other types of joins can be constructed using other operators. I'm not sure whether the exact join you are trying to do would be easier using these methods or by changing the where clause. Documentation on the join clause can be found here. MSDN has an article on join operations with multiple links to examples of other joins, as well.
Pycharm and sys.argv arguments
In PyCharm the parameters are added in the Script Parameters
as you did but, they are enclosed in double quotes ""
and without specifying the Interpreter flags like -s
. Those flags are specified in the Interpreter options
box.
Script Parameters box contents:
"file1.txt" "file2.txt"
Interpeter flags:
-s
Or, visually:
Then, with a simple test file to evaluate:
if __name__ == "__main__":
import sys
print(sys.argv)
We get the parameters we provided (with sys.argv[0]
holding the script name of course):
['/Path/to/current/folder/test.py', 'file1.txt', 'file2.txt']
jQuery attr('onclick')
Do it the jQuery way (and fix the errors):
$('#stop').click(function() {
$('#next').click(stopMoving);
// ^-- missing #
}); // <-- missing );
If the element already has a click
handler attached via the onclick
attribute, you have to remove it:
$('#next').attr('onclick', '');
Update: As @Drackir pointed out, you might also have to call $('#next').unbind('click');
in order to remove other click handlers attached via jQuery.
But this is guessing here. As always: More information => better answers.
Delete a row in Excel VBA
Chris Nielsen's solution is simple and will work well. A slightly shorter option would be...
ws.Rows(Rand).Delete
...note there is no need to specify a Shift when deleting a row as, by definition, it's not possible to shift left
Incidentally, my preferred method for deleting rows is to use...
ws.Rows(Rand) = ""
...in the initial loop. I then use a Sort function to push these rows to the bottom of the data. The main reason for this is because deleting single rows can be a very slow procedure (if you are deleting >100). It also ensures nothing gets missed as per Robert Ilbrink's comment
You can learn the code for sorting by recording a macro and reducing the code as demonstrated in this expert Excel video. I have a suspicion that the neatest method (Range("A1:Z10").Sort Key1:=Range("A1"), Order1:=xlSortAscending/Descending, Header:=xlYes/No) can only be discovered on pre-2007 versions of Excel...but you can always reduce the 2007/2010 equivalent code
Couple more points...if your list is not already sorted by a column and you wish to retain the order, you can stick the row number 'Rand' in a spare column to the right of each row as you loop through. You would then sort by that comment and eliminate it
If your data rows contain formatting, you may wish to find the end of the new data range and delete the rows that you cleared earlier. That's to keep the file size down. Note that a single large delete at the end of the procedure will not impair your code's performance in the same way that deleting single rows does
release Selenium chromedriver.exe from memory
I have this issue. I suspect its due to the version of Serenity BDD and Selenium. The chromedriver process never releases until the entire test suite finishes. There are only 97 tests, but having 97 processes eat up the memory of a server that hasn't much resources may be having an affect on the performance.
To address I did 2 things (this is specific to windows).
before each test (annotated with @Before) get the process id (PID) of the chromedriver process with:
List<Integer> pids = new ArrayList<Integer>();
String out;
Process p = Runtime.getRuntime().exec("tasklist /FI \"IMAGENAME eq chromedriver.exe*\"");
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((out = input.readLine()) != null) {
String[] items = StringUtils.split(out, " ");
if (items.length > 1 && StringUtils.isNumeric(items[1])) {
pids.add(NumberUtils.toInt(items[1]));
}
}
after each test (annotated with @After) kill the PID with:
Runtime.getRuntime().exec("taskkill /F /PID " + pid);
I need a Nodejs scheduler that allows for tasks at different intervals
I've used node-cron and agenda.
node-cron is a very simple library, which provide very basic and easy to understand api like crontab. It doesn't need any config and just works.
var cronJob = require('cron').CronJob;
var myJob = new cronJob('00 30 11 * * 1-5', function(){...});
myJob.start();
agenda is very powerful and fit for much more complex services. Think about ifttt, you have to run millions of tasks. agenda would be the best choice.
Note: You need Mongodb to use Agenda
var Agenda = require("Agenda");
var agenda = new Agenda({db: { address: 'localhost:27017/agenda-example'}});
agenda.every('*/3 * * * *', 'delete old users');
agenda.start();
SQL Error: ORA-00913: too many values
this is a bit late.. but i have seen this problem occurs when you want to insert or delete one line from/to DB but u put/pull more than one line or more than one value ,
E.g:
you want to delete one line from DB with a specific value such as id of an item but you've queried a list of ids then you will encounter the same exception message.
regards.
Changing every value in a hash in Ruby
A bit more readable one, map
it to an array of single-element hashes and reduce
that with merge
the_hash.map{ |key,value| {key => "%#{value}%"} }.reduce(:merge)
Enum to String C++
enum Enum{ Banana, Orange, Apple } ;
static const char * EnumStrings[] = { "bananas & monkeys", "Round and orange", "APPLE" };
const char * getTextForEnum( int enumVal )
{
return EnumStrings[enumVal];
}
How to delete a line from a text file in C#?
I'd very simply:
- Open the file for read/write
- Read/seek through it until the start of the line you want to delete
- Set the write pointer to the current read pointer
- Read through to the end of the line we're deleting and skip the newline delimiters (counting the number of characters as we go, we'll call it nline)
- Read byte-by-byte and write each byte to the file
- When finished truncate the file to (orig_length - nline).
Find value in an array
Using Array#select
will give you an array of elements that meet the criteria. But if you're looking for a way of getting the element out of the array that meets your criteria, Enumerable#detect
would be a better way to go:
array = [1,2,3]
found = array.select {|e| e == 3} #=> [3]
found = array.detect {|e| e == 3} #=> 3
Otherwise you'd have to do something awkward like:
found = array.select {|e| e == 3}.first
Reference jars inside a jar
You will need a custom class loader for this, have a look at One Jar.
One-JAR lets you package a Java application together with its dependency Jars into a single executable Jar file.
It has an ant task which can simplify the building of it as well.
REFERENCE (from background)
Most developers reasonably assume that putting a dependency Jar file into their own Jar file, and adding a Class-Path attribute to the META-INF/MANIFEST will do the trick:
jarname.jar
| /META-INF
| | MANIFEST.MF
| | Main-Class: com.mydomain.mypackage.Main
| | Class-Path: commons-logging.jar
| /com/mydomain/mypackage
| | Main.class
| commons-logging.jar
Unfortunately this is does not work. The Java Launcher$AppClassLoader
does not know how to load classes from a Jar inside a Jar with this kind of Class-Path
. Trying to use jar:file:jarname.jar!/commons-logging.jar
also leads down a dead-end. This approach will only work if you install (i.e. scatter) the supporting Jar files into the directory where the jarname.jar file is installed.
How do I choose grid and block dimensions for CUDA kernels?
The answers above point out how the block size can impact performance and suggest a common heuristic for its choice based on occupancy maximization. Without wanting to provide the criterion to choose the block size, it would be worth mentioning that CUDA 6.5 (now in Release Candidate version) includes several new runtime functions to aid in occupancy calculations and launch configuration, see
CUDA Pro Tip: Occupancy API Simplifies Launch Configuration
One of the useful functions is cudaOccupancyMaxPotentialBlockSize
which heuristically calculates a block size that achieves the maximum occupancy. The values provided by that function could be then used as the starting point of a manual optimization of the launch parameters. Below is a little example.
#include <stdio.h>
/************************/
/* TEST KERNEL FUNCTION */
/************************/
__global__ void MyKernel(int *a, int *b, int *c, int N)
{
int idx = threadIdx.x + blockIdx.x * blockDim.x;
if (idx < N) { c[idx] = a[idx] + b[idx]; }
}
/********/
/* MAIN */
/********/
void main()
{
const int N = 1000000;
int blockSize; // The launch configurator returned block size
int minGridSize; // The minimum grid size needed to achieve the maximum occupancy for a full device launch
int gridSize; // The actual grid size needed, based on input size
int* h_vec1 = (int*) malloc(N*sizeof(int));
int* h_vec2 = (int*) malloc(N*sizeof(int));
int* h_vec3 = (int*) malloc(N*sizeof(int));
int* h_vec4 = (int*) malloc(N*sizeof(int));
int* d_vec1; cudaMalloc((void**)&d_vec1, N*sizeof(int));
int* d_vec2; cudaMalloc((void**)&d_vec2, N*sizeof(int));
int* d_vec3; cudaMalloc((void**)&d_vec3, N*sizeof(int));
for (int i=0; i<N; i++) {
h_vec1[i] = 10;
h_vec2[i] = 20;
h_vec4[i] = h_vec1[i] + h_vec2[i];
}
cudaMemcpy(d_vec1, h_vec1, N*sizeof(int), cudaMemcpyHostToDevice);
cudaMemcpy(d_vec2, h_vec2, N*sizeof(int), cudaMemcpyHostToDevice);
float time;
cudaEvent_t start, stop;
cudaEventCreate(&start);
cudaEventCreate(&stop);
cudaEventRecord(start, 0);
cudaOccupancyMaxPotentialBlockSize(&minGridSize, &blockSize, MyKernel, 0, N);
// Round up according to array size
gridSize = (N + blockSize - 1) / blockSize;
cudaEventRecord(stop, 0);
cudaEventSynchronize(stop);
cudaEventElapsedTime(&time, start, stop);
printf("Occupancy calculator elapsed time: %3.3f ms \n", time);
cudaEventRecord(start, 0);
MyKernel<<<gridSize, blockSize>>>(d_vec1, d_vec2, d_vec3, N);
cudaEventRecord(stop, 0);
cudaEventSynchronize(stop);
cudaEventElapsedTime(&time, start, stop);
printf("Kernel elapsed time: %3.3f ms \n", time);
printf("Blocksize %i\n", blockSize);
cudaMemcpy(h_vec3, d_vec3, N*sizeof(int), cudaMemcpyDeviceToHost);
for (int i=0; i<N; i++) {
if (h_vec3[i] != h_vec4[i]) { printf("Error at i = %i! Host = %i; Device = %i\n", i, h_vec4[i], h_vec3[i]); return; };
}
printf("Test passed\n");
}
EDIT
The cudaOccupancyMaxPotentialBlockSize
is defined in the cuda_runtime.h
file and is defined as follows:
template<class T>
__inline__ __host__ CUDART_DEVICE cudaError_t cudaOccupancyMaxPotentialBlockSize(
int *minGridSize,
int *blockSize,
T func,
size_t dynamicSMemSize = 0,
int blockSizeLimit = 0)
{
return cudaOccupancyMaxPotentialBlockSizeVariableSMem(minGridSize, blockSize, func, __cudaOccupancyB2DHelper(dynamicSMemSize), blockSizeLimit);
}
The meanings for the parameters is the following
minGridSize = Suggested min grid size to achieve a full machine launch.
blockSize = Suggested block size to achieve maximum occupancy.
func = Kernel function.
dynamicSMemSize = Size of dynamically allocated shared memory. Of course, it is known at runtime before any kernel launch. The size of the statically allocated shared memory is not needed as it is inferred by the properties of func.
blockSizeLimit = Maximum size for each block. In the case of 1D kernels, it can coincide with the number of input elements.
Note that, as of CUDA 6.5, one needs to compute one's own 2D/3D block dimensions from the 1D block size suggested by the API.
Note also that the CUDA driver API contains functionally equivalent APIs for occupancy calculation, so it is possible to use cuOccupancyMaxPotentialBlockSize
in driver API code in the same way shown for the runtime API in the example above.
How to align center the text in html table row?
The following worked for me to vertically align content (multi-line) in a list-table
.. list-table::
:class: longtable
:header-rows: 1
:stub-columns: 1
:align: left
:widths: 20, 20, 20, 20, 20
* - Classification
- Restricted
- Company |br| Confidential
- Internal Use Only
- Public
* - Row1 col1
- Row1 col2
- Row1 col3
- Row1 col4
- Row1 col5
Using theme overrides .css option I defined:
.stub {
text-align: left;
vertical-align: top;
}
In the theme that I use 'python-docs-theme', the cell entry is defined as 'stub' class. Use your browser development menu to inspect what your theme class is for cell content and update that accordingly.
C++ Calling a function from another class
What you should do, is put CallFunction
into *.cpp file, where you include B.h.
After edit, files will look like:
B.h:
#pragma once //or other specific to compiler...
using namespace std;
class A
{
public:
void CallFunction ();
};
class B: public A
{
public:
virtual void bFunction()
{
//stuff done here
}
};
B.cpp
#include "B.h"
void A::CallFunction(){
//use B object here...
}
Referencing to your explanation, that you have tried to change B b; into pointer- it would be okay, if you wouldn't use it in that same place. You can use pointer of undefined class(but declared), because ALL pointers have fixed byte size(4), so compiler doesn't have problems with that. But it knows nothing about the object they are pointing to(simply: knows the size/boundary, not the content).
So as long as you are using the knowledge, that all pointers are same size, you can use them anywhere. But if you want to use the object, they are pointing to, the class of this object must be already defined and known by compiler.
And last clarification: objects may differ in size, unlike pointers. Pointer is a number/index, which indicates the place in RAM, where something is stored(for example index: 0xf6a7b1).
fork() and wait() with two child processes
It looks to me as though the basic problem is that you have one wait()
call rather than a loop that waits until there are no more children. You also only wait if the last fork()
is successful rather than if at least one fork()
is successful.
You should only use _exit()
if you don't want normal cleanup operations - such as flushing open file streams including stdout
. There are occasions to use _exit()
; this is not one of them. (In this example, you could also, of course, simply have the children return instead of calling exit()
directly because returning from main()
is equivalent to exiting with the returned status. However, most often you would be doing the forking and so on in a function other than main()
, and then exit()
is often appropriate.)
Hacked, simplified version of your code that gives the diagnostics I'd want. Note that your for
loop skipped the first element of the array (mine doesn't).
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
int main(void)
{
pid_t child_pid, wpid;
int status = 0;
int i;
int a[3] = {1, 2, 1};
printf("parent_pid = %d\n", getpid());
for (i = 0; i < 3; i++)
{
printf("i = %d\n", i);
if ((child_pid = fork()) == 0)
{
printf("In child process (pid = %d)\n", getpid());
if (a[i] < 2)
{
printf("Should be accept\n");
exit(1);
}
else
{
printf("Should be reject\n");
exit(0);
}
/*NOTREACHED*/
}
}
while ((wpid = wait(&status)) > 0)
{
printf("Exit status of %d was %d (%s)\n", (int)wpid, status,
(status > 0) ? "accept" : "reject");
}
return 0;
}
Example output (MacOS X 10.6.3):
parent_pid = 15820
i = 0
i = 1
In child process (pid = 15821)
Should be accept
i = 2
In child process (pid = 15822)
Should be reject
In child process (pid = 15823)
Should be accept
Exit status of 15823 was 256 (accept)
Exit status of 15822 was 0 (reject)
Exit status of 15821 was 256 (accept)
centos: Another MySQL daemon already running with the same unix socket
It may sometime arises when MySQL service does not shut down properly during the OS reboot.
The /var/lib/mysql/mysql.sock has been left. This prevents 'mysqld' from starting up.
These steps may help:
1: service mysqld start
killall -9 mysqld_safe mysqld
service mysqld start
2: rm /var/lib/mysql/mysql.sock
service mysqld start
java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex in Android Studio 3.0
Enable Multidex through build.gradle
of your app module
multiDexEnabled true
Same as below -
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.xx.xxx"
minSdkVersion 15
targetSdkVersion 27
versionCode 1
versionName "1.0"
multiDexEnabled true //Add this
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
shrinkResources true
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
Then follow below steps -
- From the
Build
menu -> press the Clean Project
button.
- When task completed, press the
Rebuild Project
button from the Build
menu.
- From menu
File -> Invalidate cashes / Restart
compile
is now deprecated so it's better to use implementation
or api
__proto__ VS. prototype in JavaScript
To put it simply:
> var a = 1
undefined
> a.__proto__
[Number: 0]
> Number.prototype
[Number: 0]
> Number.prototype === a.__proto__
true
This allows you to attach properties to X.prototype AFTER objects of type X has been instantiated, and they will still get access to those new properties through the __proto__ reference which the Javascript-engine uses to walk up the prototype chain.
Can you set a border opacity in CSS?
Other answers deal with the technical aspect of the border-opacity issue, while I'd like to present a hack(pure CSS and HTML only). Basically create a container div, having a border div and then the content div.
<div class="container">
<div class="border-box"></div>
<div class="content-box"></div>
</div>
And then the CSS:(set content border to none, take care of positioning such that border thickness is accounted for)
.container {
width: 20vw;
height: 20vw;
position: relative;
}
.border-box {
width: 100%;
height: 100%;
border: 5px solid black;
position: absolute;
opacity: 0.5;
}
.content-box {
width: 100%;
height: 100%;
border: none;
background: green;
top: 5px;
left: 5px;
position: absolute;
}
How to create a bash script to check the SSH connection?
I feel like you're trying to solve the wrong problem here. Shouldn't you be trying to make the ssh daemons more stable? Try running something like monit, which will check to see if the daemon is running and restart it if it isn't (giving you time to find the root problem behind sshd shutting down on you). Or is the network service troublesome? Try looking at man ifup
. Does the Whole Damn Thing just like to shut down on you? Well, that's a bigger problem ... try looking at your logs (start with syslog) to find hardware failures or services that are shutting your boxen down (maybe a temperature monitor?).
Making your scripts fault tolerant is great, but you might also want to make your boxen fault tolerant.
How to add new item to hash
hash.store(key, value) - Stores a key-value pair in hash.
Example:
hash #=> {"a"=>9, "b"=>200, "c"=>4}
hash.store("d", 42) #=> 42
hash #=> {"a"=>9, "b"=>200, "c"=>4, "d"=>42}
Documentation
Send private messages to friends
This is not possible now, but there is a work around. You can engage with the user in the public realm and ask them to send you private messages, but you can't send private messages back, only public ones. Of course, this all depends on if the user gives you the correct permissions.
If you have given permission to access a person's friends, you can then theoretically post on that users wall with references to each one of the friends, asking them to publicly interact with you and then potentially privately message you.
Get Friends
#if authenticated
https://graph.facebook.com/me/friends
http://developers.facebook.com/docs/reference/api/user/
Post in the Public Domain
http://developers.facebook.com/docs/reference/api/status/
Get Messages sent to that user (if given permission)
http://developers.facebook.com/docs/reference/api/message/
VB.NET Empty String Array
The array you created by Dim s(0) As String
IS NOT EMPTY
In VB.Net, the subscript you use in the array is index of the last element. VB.Net by default starts indexing at 0, so you have an array that already has one element.
You should instead try using System.Collections.Specialized.StringCollection
or (even better) System.Collections.Generic.List(Of String)
. They amount to pretty much the same thing as an array of string, except they're loads better for adding and removing items. And let's be honest: you'll rarely create an empty string array without wanting to add at least one element to it.
If you really want an empty string array, declare it like this:
Dim s As String()
or
Dim t() As String
Java resource as file
ClassLoader.getResourceAsStream
and Class.getResourceAsStream
are definitely the way to go for loading the resource data. However, I don't believe there's any way of "listing" the contents of an element of the classpath.
In some cases this may be simply impossible - for instance, a ClassLoader
could generate data on the fly, based on what resource name it's asked for. If you look at the ClassLoader
API (which is basically what the classpath mechanism works through) you'll see there isn't anything to do what you want.
If you know you've actually got a jar file, you could load that with ZipInputStream
to find out what's available. It will mean you'll have different code for directories and jar files though.
One alternative, if the files are created separately first, is to include a sort of manifest file containing the list of available resources. Bundle that in the jar file or include it in the file system as a file, and load it before offering the user a choice of resources.
Concatenate a NumPy array to another NumPy array
I had the same issue, and I couldn't comment on @Sven Marnach answer (not enough rep, gosh I remember when Stackoverflow first started...) anyway.
Adding a list of random numbers to a 10 X 10 matrix.
myNpArray = np.zeros([1, 10])
for x in range(1,11,1):
randomList = [list(np.random.randint(99, size=10))]
myNpArray = np.vstack((myNpArray, randomList))
myNpArray = myNpArray[1:]
Using np.zeros() an array is created with 1 x 10 zeros.
array([[0., 0., 0., 0., 0., 0., 0., 0., 0., 0.]])
Then a list of 10 random numbers is created using np.random and assigned to randomList.
The loop stacks it 10 high. We just have to remember to remove the first empty entry.
myNpArray
array([[31., 10., 19., 78., 95., 58., 3., 47., 30., 56.],
[51., 97., 5., 80., 28., 76., 92., 50., 22., 93.],
[64., 79., 7., 12., 68., 13., 59., 96., 32., 34.],
[44., 22., 46., 56., 73., 42., 62., 4., 62., 83.],
[91., 28., 54., 69., 60., 95., 5., 13., 60., 88.],
[71., 90., 76., 53., 13., 53., 31., 3., 96., 57.],
[33., 87., 81., 7., 53., 46., 5., 8., 20., 71.],
[46., 71., 14., 66., 68., 65., 68., 32., 9., 30.],
[ 1., 35., 96., 92., 72., 52., 88., 86., 94., 88.],
[13., 36., 43., 45., 90., 17., 38., 1., 41., 33.]])
So in a function:
def array_matrix(random_range, array_size):
myNpArray = np.zeros([1, array_size])
for x in range(1, array_size + 1, 1):
randomList = [list(np.random.randint(random_range, size=array_size))]
myNpArray = np.vstack((myNpArray, randomList))
return myNpArray[1:]
a 7 x 7 array using random numbers 0 - 1000
array_matrix(1000, 7)
array([[621., 377., 931., 180., 964., 885., 723.],
[298., 382., 148., 952., 430., 333., 956.],
[398., 596., 732., 422., 656., 348., 470.],
[735., 251., 314., 182., 966., 261., 523.],
[373., 616., 389., 90., 884., 957., 826.],
[587., 963., 66., 154., 111., 529., 945.],
[950., 413., 539., 860., 634., 195., 915.]])
Get first line of a shell command's output
Yes, that is one way to get the first line of output from a command.
If the command outputs anything to standard error that you would like to capture in the same manner, you need to redirect the standard error of the command to the standard output stream:
utility 2>&1 | head -n 1
There are many other ways to capture the first line too, including sed 1q
(quit after first line), sed -n 1p
(only print first line, but read everything), awk 'FNR == 1'
(only print first line, but again, read everything) etc.
How big can a MySQL database get before performance starts to degrade
It's kind of pointless to talk about "database performance", "query performance" is a better term here. And the answer is: it depends on the query, data that it operates on, indexes, hardware, etc. You can get an idea of how many rows are going to be scanned and what indexes are going to be used with EXPLAIN syntax.
2GB does not really count as a "large" database - it's more of a medium size.
Extract year from date
As discussed in the comments, this can be achieved by converting the entry into Date
format and extracting the year, for instance like this:
format(as.Date(df1$Date, format="%d/%m/%Y"),"%Y")
Can I invoke an instance method on a Ruby module without including it?
After almost 9 years here's a generic solution:
module CreateModuleFunctions
def self.included(base)
base.instance_methods.each do |method|
base.module_eval do
module_function(method)
public(method)
end
end
end
end
RSpec.describe CreateModuleFunctions do
context "when included into a Module" do
it "makes the Module's methods invokable via the Module" do
module ModuleIncluded
def instance_method_1;end
def instance_method_2;end
include CreateModuleFunctions
end
expect { ModuleIncluded.instance_method_1 }.to_not raise_error
end
end
end
The unfortunate trick you need to apply is to include the module after the methods have been defined. Alternatively you may also include it after the context is defined as ModuleIncluded.send(:include, CreateModuleFunctions)
.
Or you can use it via the reflection_utils gem.
spec.add_dependency "reflection_utils", ">= 0.3.0"
require 'reflection_utils'
include ReflectionUtils::CreateModuleFunctions
How can I remount my Android/system as read-write in a bash script using adb?
Probable cause that remount
fails is you are not running adb
as root
.
Shell Script should be as follow.
# Script to mount Android Device as read/write.
# List the Devices.
adb devices;
# Run adb as root (Needs root access).
adb root;
# Since you're running as root su is not required
adb shell mount -o rw,remount /;
If this fails, you could try the below:
# List the Devices.
adb devices;
# Run adb as root
adb root;
adb remount;
adb shell su -c "mount -o rw,remount /";
To find which user
you are:
$ adb shell whoami
Can't drop table: A foreign key constraint fails
Try this:
SELECT *
FROM information_schema.KEY_COLUMN_USAGE
WHERE REFERENCED_TABLE_NAME = 'YourTable';
This should deliver you which Tables have references to the table you want to drop, once you drop these references, or the datasets which reference datasets in this table you will be able to drop the table
Eloquent get only one column as an array
That can be done in short as:
Model::pluck('column')
where model is the Model such as User
model & column as column name like id
if you do
User::pluck('id') // [1,2,3, ...]
& of course you can have any other clauses like where
clause before pluck
Compare DATETIME and DATE ignoring time portion
Though I upvoted the answer marked as correct. I wanted to touch on a few things for anyone stumbling upon this.
In general, if you're filtering specifically on Date values alone. Microsoft recommends using the language neutral format of ymd
or y-m-d
.
Note that the form '2007-02-12' is considered language-neutral only
for the data types DATE, DATETIME2, and DATETIMEOFFSET.
To do a date comparison using the aforementioned approach is simple. Consider the following, contrived example.
--112 is ISO format 'YYYYMMDD'
declare @filterDate char(8) = CONVERT(char(8), GETDATE(), 112)
select
*
from
Sales.Orders
where
CONVERT(char(8), OrderDate, 112) = @filterDate
In a perfect world, performing any manipulation to the filtered column should be avoided because this can prevent SQL Server from using indexes efficiently. That said, if the data you're storing is only ever concerned with the date and not time, consider storing as DATETIME
with midnight as the time. Because:
When SQL Server converts the literal to the filtered column’s type, it
assumes midnight when a time part isn’t indicated. If you want such a
filter to return all rows from the specified date, you need to ensure
that you store all values with midnight as the time.
Thus, assuming you are only concerned with date, and store your data as such. The above query can be simplified to:
--112 is ISO format 'YYYYMMDD'
declare @filterDate char(8) = CONVERT(char(8), GETDATE(), 112)
select
*
from
Sales.Orders
where
OrderDate = @filterDate
jQuery find events handlers registered with an object
To check for events on an element:
var events = $._data(element, "events")
Note that this will only work with direct event handlers, if you are using $(document).on("event-name", "jq-selector", function() { //logic }), you will want to see the getEvents function at the bottom of this answer
For example:
var events = $._data(document.getElementById("myElemId"), "events")
or
var events = $._data($("#myElemId")[0], "events")
Full Example:
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js" type="text/javascript"></script>
<script>
$(function() {
$("#textDiv").click(function() {
//Event Handling
});
var events = $._data(document.getElementById('textDiv'), "events");
var hasEvents = (events != null);
});
</script>
</head>
<body>
<div id="textDiv">Text</div>
</body>
</html>
A more complete way to check, that includes dynamic listeners, installed with $(document).on
function getEvents(element) {
var elemEvents = $._data(element, "events");
var allDocEvnts = $._data(document, "events");
for(var evntType in allDocEvnts) {
if(allDocEvnts.hasOwnProperty(evntType)) {
var evts = allDocEvnts[evntType];
for(var i = 0; i < evts.length; i++) {
if($(element).is(evts[i].selector)) {
if(elemEvents == null) {
elemEvents = {};
}
if(!elemEvents.hasOwnProperty(evntType)) {
elemEvents[evntType] = [];
}
elemEvents[evntType].push(evts[i]);
}
}
}
}
return elemEvents;
}
Example usage:
getEvents($('#myElemId')[0])
Calculate compass bearing / heading to location in Android
I'm no expert in map-reading / navigation and so on but surely 'directions' are absolute and not relative or in reality, they are relative to N or S which themselves are fixed/absolute.
Example: Suppose an imaginary line drawn between you and your destination corresponds with 'absolute' SE (a bearing of 135 degrees relative to magnetic N). Now suppose your phone is pointing NW - if you draw an imaginary line from an imaginary object on the horizon to your destination, it will pass through your location and have an angle of 180 degrees. Now 180 degrees in the sense of a compass actually refers to S but the destination is not 'due S' of the imaginary object your phone is pointing at and, moreover, if you travelled to that imaginary point, your destination would still be SE of where you moved to.
In reality, the 180 degree line actually tells you the destination is 'behind you' relative to the way the phone (and presumably you) are pointing.
Having said that, however, if calculating the angle of a line from the imaginary point to your destination (passing through your location) in order to draw a pointer towards your destination is what you want...simply subtract the (absolute) bearing of the destination from the absolute bearing of the imaginary object and ignore a negation (if present). e.g., NW - SE is 315 - 135 = 180 so draw the pointer to point at the bottom of the screen indicating 'behind you'.
EDIT: I got the Maths slightly wrong...subtract the smaller of the bearings from the larger then subtract the result from 360 to get the angle in which to draw the pointer on the screen.
jQuery: Clearing Form Inputs
You may try
$("#addRunner input").each(function(){ ... });
Inputs are no selectors, so you do not need the :
Haven't tested it with your code. Just a fast guess!
Why are Python's 'private' methods not actually private?
Similar behavior exists when module attribute names begin with a single underscore (e.g. _foo).
Module attributes named as such will not be copied into an importing module when using the from*
method, e.g.:
from bar import *
However, this is a convention and not a language constraint. These are not private attributes; they can be referenced and manipulated by any importer. Some argue that because of this, Python can not implement true encapsulation.
Android Studio Run/Debug configuration error: Module not specified
You have 3 ways:
Clean Project in Android Studio menu
Build -> Clean Project and use Build -> Rebuild
Remove all the modules in settings.gradle
- Open settings.gradle project
- Remove include ':app' and and other modules
- Sync gradle
- Add include ':app' and and other modules
- Sync gradle again
Remove all code in gradle.properties
Errors: "INSERT EXEC statement cannot be nested." and "Cannot use the ROLLBACK statement within an INSERT-EXEC statement." How to solve this?
My work around for this problem has always been to use the principle that single hash temp tables are in scope to any called procs. So, I have an option switch in the proc parameters (default set to off). If this is switched on, the called proc will insert the results into the temp table created in the calling proc. I think in the past I have taken it a step further and put some code in the called proc to check if the single hash table exists in scope, if it does then insert the code, otherwise return the result set. Seems to work well - best way of passing large data sets between procs.
How should I make my VBA code compatible with 64-bit Windows?
This answer is likely wrong wrong the context. I thought VBA now run on the CLR these days, but it does not. In any case, this reply may be useful to someone. Or not.
If you run Office 2010 32-bit mode then it's the same as Office 2007. (The "issue" is Office running in 64-bit mode). It's the bitness of the execution context (VBA/CLR) which is important here and the bitness of the loaded VBA/CLR depends upon the bitness of the host process.
Between 32/64-bit calls, most notable things that go wrong are using long
or int
(constant-sized in CLR) instead of IntPtr
(dynamic sized based on bitness) for "pointer types".
The ShellExecute function has a signature of:
HINSTANCE ShellExecute(
__in_opt HWND hwnd,
__in_opt LPCTSTR lpOperation,
__in LPCTSTR lpFile,
__in_opt LPCTSTR lpParameters,
__in_opt LPCTSTR lpDirectory,
__in INT nShowCmd
);
In this case, it is important HWND is IntPtr
(this is because a HWND is a "HANDLE" which is void*
/"void pointer") and not long
. See pinvoke.net ShellExecute as an example. (While some "solutions" are shady on pinvoke.net, it's a good place to look initially).
Happy coding.
As far as any "new syntax", I have no idea.
What are intent-filters in Android?
There can be no two Lancher AFAIK. Logcat is a usefull tool to debug and check application/machine status in the behind. it will be automatic while switching from one activity to another activity.
Usage of MySQL's "IF EXISTS"
The accepted answer works well and one can also just use the
If Exists (...) Then ... End If;
syntax in Mysql procedures (if acceptable for circumstance) and it will behave as desired/expected. Here's a link to a more thorough source/description: https://dba.stackexchange.com/questions/99120/if-exists-then-update-else-insert
One problem with the solution by @SnowyR is that it does not really behave like "If Exists" in that the (Select 1 = 1 ...) subquery could return more than one row in some circumstances and so it gives an error. I don't have permissions to respond to that answer directly so I thought I'd mention it here in case it saves someone else the trouble I experienced and so others might know that it is not an equivalent solution to MSSQLServer "if exists"!
Can we add div inside table above every <tr>?
If we follow the w3 org table reference ,and follow the Permitted Contents section, we can see that the table
tags takes tbody
(optional) and tr
as the only permitted contents.
So i reckon it is safe to say we cannot add a div
tag which is a flow content as a direct child of the table
which i understand is what you meant when you had said above a tr
.
Having said that , as we follow the above link , you will find that it is safe to use div
s inside the td
element as seen here
Lombok added but getters and setters not recognized in Intellij IDEA
If you are on Mac
, make sure you enable annotation processing (tick the checkbox) at these 2 places.
1.) Intellij IDEA -> Preferences -> Compiler -> Annotation Processors
2.) File -> Other Settings -> Default Settings -> Compiler -> Annotation Processors
And then
3.) Intellij IDEA -> Preferences -> Plugins ->Browse Repositories-> Search for "Lombok"-> install plugin -> Apply and restart IDEA
4.) And then probably restart Intellij IDEA.
This is my IntelliJ IDEA and Mac Version - IntelliJ IDEA 2017.1.5 Build #IU-171.4694.70 --- Mac OS X 10.12
Setting a div's height in HTML with CSS
I had the same problem on my site (shameless plug).
I had the nav section "float: right" and the main body of the page has a background image about 250px across aligned to the right and "repeat-y". I then added something with "clear: both" to it. Here is the W3Schools and the CSS clear property.
I placed the clear at the bottom of the "page" classed div. My page source looks something like this.
body
-> header (big blue banner)
-> headerNav (green bar at the top)
-> breadcrumbs (invisible at the moment)
-> page
-> navigation (floats to the right)
-> content (main content)
-> clear (the quote at the bottom)
-> footerNav (the green bar at the bottom)
-> clear (empty but still does something)
-> footer (blue thing at the bottom)
I hope that helps :)
How to convert a string to utf-8 in Python
In Python 3.6, they do not have a built-in unicode() method.
Strings are already stored as unicode by default and no conversion is required. Example:
my_str = "\u221a25"
print(my_str)
>>> v25
Synchronous XMLHttpRequest warning and <script>
Even the latest jQuery has that line, so you have these options:
- Change the source of jQuery yourself - but maybe there is a good reason for its usage
- Live with the warning, please note that this option is deprecated and not obsolete.
- Change your code, so it does not use this function
I think number 2 is the most sensible course of action in this case.
By the way if you haven't already tried, try this out: $.ajaxSetup({async:true});
, but I don't think it will work.