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detach all packages while working in R
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So, someone should have simply answered the following.
lapply(paste('package:',names(sessionInfo()$otherPkgs),sep=""),detach,character.only=TRUE,unload=TRUE)
(edit: 6-28-19)
In the latest version of R 3.6.0 please use instead.
invis...
How can I prevent SQL injection in PHP?
... Also, the official documentation of mysql_query only allows to execute one query, so any other query besides ; is ignored. Even if this is already deprecated there are a lot of systems under PHP 5.5.0 and that may use this function. php.net/manual/en/function.mysql-query.php
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AngularJS with Django - Conflicting template tags
...y both use {{ }} as their template tags. Is there an easy way to change one of the two to use some other custom templating tag?
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Why does sun.misc.Unsafe exist, and how can it be used in the real world?
...ts and then interpret the constructor invocation as any other method call.
One can track the data from the native address.It is possible to retrieve an
object’s memory address using the java.lang.Unsafe class, and operate on its fields directly via unsafe get/put methods!
Compile time optimization...
Explanation of JSONB introduced by PostgreSQL
...ONB and it's already trending on hacker news . It would be great if someone could explain how it's different from Hstore and JSON previously present in PostgreSQL. What are its advantages and limitations and when should someone consider using it?
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What is the advantage of using Restangular over ngResource?
...n this by "remembering" the URLs.
So if you do in some place
Restangular.one("users", 123).get().then(function(user) {
$scope.user = user;
});
// Some other code
//Automatically does the request to /users/123/cars as it remembers in which object you're asking it.
$scope.user.getList('cars')
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Unable to update the EntitySet - because it has a DefiningQuery and no element exis
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It usually happens because one of the following reasons:
Entity Set is mapped from Database view
A custom Database query
Database table doesn't have a primary key
After doing so, you may still need to update in the Entity Framework designer (or alt...
Which C++ idioms are deprecated in C++11?
...due to first-class support for rvalue references.
Safe bool: This was mentioned earlier. Explicit operators of C++11 obviate this very common C++03 idiom.
Shrink-to-fit: Many C++11 STL containers provide a shrink_to_fit() member function, which should eliminate the need swapping with a temporary.
Te...
How to play a sound in C#, .NET
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For Windows Forms one way is to use the SoundPlayer
private void Button_Click(object sender, EventArgs e)
{
using (var soundPlayer = new SoundPlayer(@"c:\Windows\Media\chimes.wav")) {
soundPlayer.Play(); // can also use soundPlaye...
Why is it impossible to build a compiler that can determine if a C++ function will change the value
...ven program will terminate. This is known as the halting problem, and it's one of those things that's not computable.
To be clear, you can write a compiler that can determine that a function does change the variable in some cases, but you can't write one that reliably tells you that the function wi...