[Numpy-discussion] numpy.random.shuffle
Robert
kxroberto at googlemail.com
Wed Nov 22 04:48:25 CST 2006
is this an error when shuffle doubles&looses items on a 2-d array? :
>>> r=arange(20)
>>> rr=ziparrays(r,r) #numpy.vstack(*args).transpose()
>>> rr
array([[ 0, 0],
[ 1, 1],
[ 2, 2],
[ 3, 3],
[ 4, 4],
[ 5, 5],
[ 6, 6],
[ 7, 7],
[ 8, 8],
[ 9, 9],
[10, 10],
[11, 11],
[12, 12],
[13, 13],
[14, 14],
[15, 15],
[16, 16],
[17, 17],
[18, 18],
[19, 19]])
>>> numpy.random.shuffle(rr)
>>> rr
array([[ 0, 0],
[ 0, 0],
[ 2, 2],
[ 2, 2],
[ 3, 3],
[ 3, 3],
[ 5, 5],
[ 2, 2],
[ 0, 0],
[ 8, 8],
[10, 10],
[ 1, 1],
[10, 10],
[11, 11],
[12, 12],
[ 2, 2],
[10, 10],
[15, 15],
[ 6, 6],
[16, 16]])
>>>
on 1-d arrays it seems to be consistent as expected:
>>> numpy.random.shuffle(r)
>>> r
array([ 6, 1, 3, 17, 0, 11, 15, 7, 14, 10, 9, 2, 8, 12, 5, 4, 19,
16, 13, 18])
>>>
Robert
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