[Numpy-discussion] initialise an array

Tim Hochberg tim.hochberg at cox.net
Tue Jan 10 08:47:05 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
>
> How can I do something similar? Do I have to use the function suggest 
> in the error message? The function is something inside a long script 
> with a lot of condition similar to this one so it's why I ask if it's 
> normal to not have the special None parameter take in count.

Use 'is', for example:

    if xall is None: xall = x

-tim

>
> Thanks,
>
> N.
>
>
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