[Numpy-discussion] numpy where function on different sized arrays

[Siegfried Gonzi]

Hi all
 
This must have been answered in the past but my google search capabilities are not the best.
 
Given an array A say of dimension 40x60 and given another array/vector B of dimension 20 (the values in B occur only once).
 
What I would like to do is the following which of course does not work (by the way doesn't work in IDL either):
 
indx=where(A == B)
 
I understand A and B are both of different dimensions. So my question: what would the fastest or proper way to accomplish this (I found a solution but think is rather awkward and not very scipy/numpy-tonic tough).
 
Thanks
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