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Best algorithm for detecting cycles in a directed graph [closed]
...s been mentioned in several answers; here I'll also provide a code example based on chapter 22 of CLRS. The example graph is illustrated below.
CLRS' pseudo-code for depth-first search reads:
In the example in CLRS Figure 22.4, the graph consists of two DFS trees: one consisting of nodes u, v,...
Install tkinter for Python
... from sources, but this is usually not the best idea with a binary package-based distro you're apparently running.
It's safer to apt-get install python-tk on your machine(s).
(Works on Debian-derived distributions like for Ubuntu; refer to your package manager and package list on other distribution...
Cast List to List in .NET 2.0
...List<int> and List<string> are completely incompatible -- on a 64-bit platform, for instance, the individual members aren't even the same size.
It is theoretically possible to treat a List<string> as a List<object> -- this gets you into the exciting worlds of covariance and ...
'and' (boolean) vs '&' (bitwise) - Why difference in behavior with lists vs numpy arrays?
...umPy arrays (of length > 1) have no truth value as this prevents vector-based logic confusion.
Example 4 is simply a vectorized bit and operation.
Bottom Line
If you are not dealing with arrays and are not performing math manipulations of integers, you probably want and.
If you have vectors o...
Hudson vs Jenkins in 2012 [closed]
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I have used both Hudson and Jenkins. I have been following both change lists.
I still think we...
Unable to generate an explicit migration in entity framework
...processed migration in your application and it requires running Update-Database before you can add another migration.
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JNI converting jstring to char *
...StringUTFChars(javaString, nativeString);
Can fix this errors:
1.error: base operand of '->' has non-pointer type 'JNIEnv {aka _JNIEnv}'
2.error: no matching function for call to '_JNIEnv::GetStringUTFChars(JNIEnv*&, _jstring*&, bool)'
3.error: no matching function for call to '_JNIE...
How do I speed up the scroll speed in a JScrollPane when using the mouse wheel?
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casablancacasablanca
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a...
Automatically import modules when entering the python or ipython interpreter
... will allow you to change the startup requirements and other configuration based on a particular case. However, if you'd always like np to be available to you then by all means put it in the startup directory.
For more information on ipython configuration. The docs have a much more complete explana...
Proper way to handle multiple forms on one page in Django
...e is my simplified example of two forms AForm and BForm using TemplateView based on the answers by @adam-nelson and @daniel-sokolowski and comment by @zeraien (https://stackoverflow.com/a/17303480/2680349):
# views.py
def _get_form(request, formcls, prefix):
data = request.POST if prefix in req...