[Numpy-discussion] difficulty with numpy.where

Dr. Phillip M. Feldman pfeldman@verizon....
Thu Oct 1 11:55:50 CDT 2009


I've defined the following one-line function that uses numpy.where:

def sin_half_period(x): return where(0.0 <= x <= pi, sin(x), 0.0)

When I try to use this function, I get an error message:

In [4]: z=linspace(0,2*pi,9)
In [5]: sin_half_period(z)
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)

The truth value of an array with more than one element is ambiguous. Use
a.any
() or a.all()

Any suggestions will be appreciated.
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