[Numpy-discussion] Re: selecting random array element
Robert Kern
robert.kern at gmail.com
Mon Feb 20 14:42:06 EST 2006
Alan G Isaac wrote:
> At http://www.american.edu/econ/pytrix/pytrix.py find
> def permute(x):
> '''Return a permutation of a sequence or array.
>
> :note: Also consider numpy.random.shuffle
> (to permute *inplace* 1-d arrays)
> '''
> x = numpy.asarray(x)
> xshape = x.shape
> pidx = numpy.random.random(x.size).argsort()
> return x.flat[pidx].reshape(xshape)
You may want to consider numpy.random.permutation()
In [22]: numpy.random.permutation?
Type: builtin_function_or_method
Base Class: <type 'builtin_function_or_method'>
String Form: <built-in method permutation of mtrand.RandomState object at
0x3f0f0>
Namespace: Interactive
Docstring:
Given an integer, return a shuffled sequence of integers >= 0 and
< x; given a sequence, return a shuffled array copy.
permutation(x)
--
Robert Kern
robert.kern at gmail.com
"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter
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