addition to MLab: randperm
Jim Dennis
jimd at vega.starshine.org
Sat Feb 2 17:54:58 EST 2002
In article <a2972632.0201171005.15e660e3 at posting.google.com>, les ander wrote:
> I needed the matlabs randperm function so i wrote one and
> wanted to see if there is a better way. I think this function would
> be a good addition to MLab:
> # given a number n, return an array that is a shuffling of
> # integers from range 0 to n
I must be missing something in your requirements.
What's wrong with:
def randperm(n):
import random
t = range(n)
random.shuffle(t)
return t
> def randperm(n):
> import MLab,Numeric
> r=MLab.rand(n)
> dict={}
> for i in range(n):
> dict[ r[i] ]=i
> r=Numeric.sort(r)
> out=Numeric.zeros(n)
> for i in range(n):
> out[i]=dict[r[i]]
> return out
> i encourage other people to post the code if they write
> more matlab type functions using the Numeric package
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