[Numpy-discussion] Silly array question

[Sasha]

>>> M.ravel()[dot(I,(4,1))]
array([ 1,  6, 11,  6])


On 4/7/06, Webb Sprague <webb.sprague at gmail.com> wrote:
>
> In R, if you have an Nx2 array of integers, you can use that to index
> an TxS array, yielding a 1xN result. Is there a way to do that in
> numpy? I looked for a pairs function but I coudn't find it, vaguely
> remembering that might be around...  I know it would be a trivial loop
> to write, but a numpy array function would be faster (I hope).
>
> Example
>
> I = [[0,0], [1,1], [2,2], [1,1]]
> M = [[1, 2, 3, 4],
>         [5, 6, 7, 8],
>         [9,10,11, 12],
>         [13, 14, 15, 16]]
>
> M[I] = [1,6,11,6].
>
> Thanks!
>
>
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