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Listing all permutations of a string/integer
... short:
The permutation of 1 element is one element.
The permutation of a set of elements is a list each of the elements, concatenated with every permutation of the other elements.
Example:
If the set just has one element -->
return it.
perm(a) -> a
If the set has two characters: for
each el...
How can I apply a function to every row/column of a matrix in MATLAB?
... using ==> arrayfun
Non-scalar in Uniform output, at index 1, output 1.
Set 'UniformOutput' to false.
Error in ==> @(func,matrix)arrayfun(applyToGivenRow(func,matrix),1:size(matrix,1))'
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What is the difference between a mutable and immutable string in C#?
...utable objects are dangerous to use as keys into any form of Dictionary or set- the objects themselves could change, and the data structure would have no way of knowing, leading to corrupt data that would, eventually, crash your program.
However, you can change its contents- so it's much, much more...
How can I parse a time string containing milliseconds in it with python?
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Python 2.6 added a new strftime/strptime macro %f, which does microseconds. Not sure if this is documented anywhere. But if you're using 2.6 or 3.0, you can do this:
time.strptime('30/03/09 16:31:32.123', '%d/%m/%y %H:%M:%S.%f')
Edit: I never rea...
.keyCode vs. .which
...ver both. If the key pressed generates a character (e.g. 'a'), charCode is set to the code of that character, respecting the letter case. (i.e. charCode takes into account whether the shift key is held down). Otherwise, the code of the pressed key is stored in keyCode.
keyCode is always set in the k...
What would cause an algorithm to have O(log n) complexity?
...r words, don't think about small problems where the "constant overhead" of setting up the problem matters, think about big problems. And when thinking about big problems, big-Oh of (some function of N) means that the run-time is still always less than some constant times that function. Always.
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How to get process ID of background process?
I start a background process from my shell script, and I would like to kill this process when my script finishes.
7 Answers...
Convert SVG to PNG in Python
...the *.svg file, to extract the HEIGHT and WIDTH from there, but it is both set to 100%. Of course, I can look into the properties of the picture, but since this is only one step in image processing this is not what I want.
– quapka
Jun 9 '14 at 9:19
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How is set() implemented?
I've seen people say that set objects in python have O(1) membership-checking. How are they implemented internally to allow this? What sort of data structure does it use? What other implications does that implementation have?
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find filenames NOT ending in specific extensions on Unix?
Is there a simple way to recursively find all files in a directory hierarchy, that do not end in a list of extensions? E.g. all files that are not *.dll or *.exe
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