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Why is MATLAB so fast in matrix multiplication?
... 0.0229
>> gputimeit(@()gA*gA)
ans =
4.8019e-04
(NB: at some point (I forget when exactly) gpuArray switched from MAGMA to cuBLAS - MAGMA is still used for some gpuArray operations though)
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What do two question marks together mean in C#?
...e an expression is a method call with side effects. (Credit to @Joey for pointing this out.)
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How do I get the type name of a generic type argument?
...tatic void Main(string[] args)
{
Console.WriteLine(MyMethod<int>());
Console.ReadKey();
}
}
Running the above prints (as expected):
System.Int32
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Multiple levels of 'collection.defaultdict' in Python
...:
from collections import defaultdict
d = defaultdict(lambda: defaultdict(int))
This will create a new defaultdict(int) whenever a new key is accessed in d.
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Android Fragments. Retaining an AsyncTask during screen rotation or configuration change
...e through Fragment.getActivity().isChangingConfigurations(). So, at the point where you would decide to stop your AsyncTask (in onStop() or onDestroy() most likely), you could for example check if the configuration is changing and if so stick it in a static SparseArray under the fragment's identifi...
How to make a window always stay on top in .Net?
...ion, anyway.
First, import the following namespace:
using System.Runtime.InteropServices;
Add a few variables to your class declaration:
private static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);
private const UInt32 SWP_NOSIZE = 0x0001;
private const UInt32 SWP_NOMOVE = 0x0002;
private cons...
Clearing intent
My Android app is getting called by an intent that is passing information (pendingintent in statusbar).
20 Answers
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Abstract class in Java
...act methods which the inheriting subclass must implement.
Provide a common interface which allows the subclass to be interchanged with all other subclasses.
Here's an example:
abstract public class AbstractClass
{
abstract public void abstractMethod();
public void implementedMethod() { Sy...
Sum a list of numbers in Python
... you want to see decimals in the result, even though your input values are integers. By default, Python does integer division: it discards the remainder. To divide things through all the way, we need to use floating-point numbers. Fortunately, dividing an int by a float will produce a float, so we j...
How to set environment variables in Python?
...le DEBUSSY to the string 1.
To access this variable later, simply use:
print(os.environ["DEBUSSY"])
Child processes automatically inherit the environment variables of the parent process -- no special action on your part is required.
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