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Slicing of a NumPy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)?
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There is a helpful function for doing the first example I gave, numpy.ix_. You can do the same thing as my first example with x[numpy.ix_([0,2],[1,3])]. This can save you from having to enter in all of those extra brackets.
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Advantage of creating a generic repository vs. specific repository for each object?
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public abstract class Repository<TEntity>
{
private DataContext _dataContext;
protected Repository(DataContext dataContext)
{
_dataContext = dataContext;
}
protected IQueryable<TEntity> Query
{
get { return _dataContext.GetTable<TEntity>()...
Typical .gitignore file for an Android app
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You can mix Android.gitignore:
# built application files
*.apk
*.ap_
# files for the dex VM
*.dex
# Java class files
*.class
# generated files
bin/
gen/
# Local configuration file (sdk path, etc)
local.properties
with Eclipse.gitignore:
*.pydevproject
.project
.metadata
bin/**
tmp/**
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Date vs DateTime
...portion of the value.
public static void Main()
{
System.DateTime _Now = DateAndTime.Now;
Console.WriteLine("The Date and Time is " + _Now);
//will return the date and time
Console.WriteLine("The Date Only is " + _Now.Date);
//will return only the date
Console.Write("Pre...
Is it possible to delete an object's property in PHP?
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unset($a->new_property);
This works for array elements, variables, and object attributes.
Example:
$a = new stdClass();
$a->new_property = 'foo';
var_export($a); // -> stdClass::__set_state(array('new_property' => 'foo'))
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How to structure a express.js application?
...js
|~models
| |-monkey.js
| |-zoo.js
|~views
| |~zoos
| |-new.jade
| |-_form.jade
|~test
| |~controllers
| |-zoo.js
| |~models
| |-zoo.js
|-index.js
I use Exports to return what's relevant. For instance, in the models I do:
module.exports = mongoose.model('PhoneNumber', PhoneNumberSchem...
关于App Inventor 2过程积木，被问最多的6个问题 - App应用开发 - 清泛IT社...
...>做过程名。完整列表在 <a href="https://en.wikipedia.org/wiki/List_of_Java_keywords" target="_blank">Java关键字列表</a> ，常见的有 <font face="Courier New">if</font>、<font face="Courier New">else</font>、<font face="Courier New">while</font>、<font face="Courier New">for</font...
PHP and MySQL - how to avoid password in source code? [duplicate]
...e the below code:
// Check if it's been set by the web server
if (!empty($_ENV['ENVIRONMENT'])) {
// Copy from web server to PHP constant
define('ENVIRONMENT', $_ENV['ENVIRONMENT']);
}
if (!defined('ENVIRONMENT')) {
// Default to development
define('ENVIRONMENT', 'development');
}
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Longest line in a file
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awk '{print length, $0}' Input_file |sort -nr|head -1
For reference : Finding the longest line in a file
share
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improve this answer
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IntelliJ gives Fatal Error: Unable to find package java.lang in classpath or bootclasspath
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This error happend to me after i've updated my JDK version to jdk1.8.0_161 -
But the project's sdk was still pointing to the old jdk 1.8.0_131
(Seems that updgrading java causing the previous version to be wiped).
Do this:
In the IntelliJ IDE go to File > Project Structure, from there:
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