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Fast permutation -> number -> permutation mapping algorithms
I have n elements. For the sake of an example, let's say, 7 elements, 1234567. I know there are 7! = 5040 permutations possible of these 7 elements.
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Apply pandas function to column to create multiple new columns?
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Multiple linear regression in Python
... regress my dependent variable (y) against several independent variables (x1, x2, x3, etc.).
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What are the differences between json and simplejson Python modules?
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What is the difference between 0.0.0.0, 127.0.0.1 and localhost?
... mac. I found that Jekyll server will bind to 0.0.0.0:4000 instead of 127.0.0.1:4000 . Also gem server will bind to this address by default. I can still visit it via http://localhost:port . But for Jekyll , it seems that the default setting (e.g. 0.0.0.0:4000) requires Internet access. I c...
Reference — What does this symbol mean in PHP?
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Incrementing / Decrementing Operators
++ increment operator
-- decrement operator
Example ...
How do you detect where two line segments intersect? [closed]
...first line segment (p + t r):
t0 = (q − p) · r / (r · r)
t1 = (q + s − p) · r / (r · r) = t0 + s · r / (r · r)
If the interval between t0 and t1 intersects the interval [0, 1] then the line segments are collinear and overlapping; otherwise they are collinear and disj...
How to drop rows of Pandas DataFrame whose value in a certain column is NaN
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How to use glOrtho() in OpenGL?
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Have a look at this picture: Graphical Projections
The glOrtho command produces an "Oblique"...