Numpy 1.10
Numpy 1.10
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numpy.diag()

numpy.diag

numpy.diag(v, k=0) [source]

Extract a diagonal or construct a diagonal array.

See the more detailed documentation for numpy.diagonal if you use this function to extract a diagonal and wish to write to the resulting array; whether it returns a copy or a view depends on what version of numpy you are using.

Parameters:

v : array_like

If v is a 2-D array, return a copy of its k-th diagonal. If v is a