[Numpy-discussion] where construct

Andrew Straw strawman@astraw....
Sun Dec 16 13:38:56 CST 2007


"or" is logical or. You want "|" which is bitwise/elementwise or. Also, 
watch the order of operations -- | has higher precedence than <.

Thus, you want

where( (a<1) | (b<3), b,c)

Ross Harder wrote:
> What's the correct way to do something like this?
>
> a=array( (0,1,1,0) )
> b=array( (4,3,2,1) )
> c=array( (1,2,3,4) )
>
> where( (a<1 or b<3), b,c)
>
> Python throws a ValueError
> I would expect to get an array that looks like
> [4,2,2,1] I think
>
>
> Thanks,
> Ross
>
>
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