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How do I save a UIImage to a file?
...SData and save that to disk.
// Create path.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Image.png"];
// Save image.
[UIImagePNGRepresentation(image) writeToFile:fil...
Easiest way to convert int to string in C++
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C++11 introduces std::stoi (and variants for each numeric type) and std::to_string, the counterparts of the C atoi and itoa but expressed in term of std::string.
#include <string>
std::string s = std::to_string(42);
is therefore the shortest way I can thi...
How can the Euclidean distance be calculated with NumPy?
...etween a norm (in this case the Frobenius norm/2-norm which is the default for norm function) and a metric (in this case Euclidean distance).
– Mark Lavin
Sep 9 '09 at 20:27
7
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mongodb: insert if not exists
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Sounds like you want to do an "upsert". MongoDB has built-in support for this. Pass an extra parameter to your update() call: {upsert:true}. For example:
key = {'key':'value'}
data = {'key2':'value2', 'key3':'value3'};
coll.update(key, data, upsert=True); #In python upsert must be passed a...
Set focus on TextBox in WPF from view model
... on any UIElement. And it can be bound to ViewModel's property "IsFocused" for example. Here it is:
public static class FocusExtension
{
public static bool GetIsFocused(DependencyObject obj)
{
return (bool) obj.GetValue(IsFocusedProperty);
}
public static void SetIsFocused(...
Is there a better way of writing v = (v == 0 ? 1 : 0); [closed]
...optimal operations possible. I'll be using these in my own projects, but unfortunately when I need the code to be understood by coworkers I'll have to default to a more logic-based approach. Thank you though, your answer has made my day.
– Ollie Glass
Aug 2 '11...
How to compile for Windows on Linux with gcc/g++?
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mingw32 exists as a package for Linux. You can cross-compile and -link Windows applications with it. There's a tutorial here at the Code::Blocks forum. Mind that the command changes to x86_64-w64-mingw32-gcc-win32, for example.
Ubuntu, for example, has...
Is there a 'box-shadow-color' property?
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I can confirm it's the same for IE10.
– MaxArt
May 2 '13 at 10:03
4
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How to use mongoimport to import csv
Trying to import a CSV with contact information:
21 Answers
21
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Matrix Transpose in Python
I am trying to create a matrix transpose function for python but I can't seem to make it work.
Say I have
18 Answers
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