[Numpy-discussion] permutation and array subsets
Serge Rey
serge at rohan.sdsu.edu
Wed Aug 8 00:38:30 EDT 2001
i'm trying to use the results of permutation (from RandomArray.py) to
reorder the rows of an array:
>>> r=arange(20)
>>> id=permutation(20)
>>> y=r[id]
Traceback (most recent call last):
File "<stdin>", line 1, in ?
IndexError: invalid index
>>>
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
--
Sergio J. Rey http://typhoon.sdsu.edu/rey.html
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