[SciPy-user] [Numpy-discussion] initialise an array

Travis Oliphant oliphant.travis at ieee.org
Tue Jan 10 09:54:05 CST 2006

Humufr wrote:

> Hello,
> I have a function like this:
> def test(x,xall=None):
>     if xall == None: xall =x
> I obtain this error message when I'm doing this with numpy (I don't 
> have this problem with numarray and Numeric).
> ValueError: The truth value of an array with more than one element is 
> ambiguous. Use a.any() or a.all

You probably want to do

if xall is None: xall = x

This will not only be faster but will also not be ambiguous.


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