i'm trying to use the results of permutation (from RandomArray.py) to reorder the rows of an array:

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r=arange(20) id=permutation(20) y=r[id]

Traceback (most recent call last): File "<stdin>", line 1, in ? IndexError: invalid index

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i can use a for loop to permutate the ordering of r, but that has a speed hit associated with it. can anyone offer a suggestion for a way to do this more efficiently?

thanks, serge