Python Stupid numpy.piecewise
piecewise() function in numpy is not very good. Due to the writing of the function, one wouldn’t be surprised to encounter the following error,
if (n != n2): raise ValueError( "function list and condition list must be the same")
n is the length of condition list and
n2 is the length of function list.
To avoid it, the input should always be prepared as following
x = np.asarray(x) # The following is important to avoid the weird behavior of piecewise() if not x.shape: x = np.asarray([x])
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