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Arrangements / PermutationsNK iterator is broken #4252

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saliola opened this issue Oct 7, 2008 · 1 comment
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Arrangements / PermutationsNK iterator is broken #4252

saliola opened this issue Oct 7, 2008 · 1 comment
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@mwhansen
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c: combinatorics r: duplicate t: bug

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@saliola
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saliola commented Oct 7, 2008 

sage: Arrangements(range(5),4).count()
116
sage: len(list(sage.combinat.permutation.PermutationsNK(5,4).iterator()))
116
sage: factorial(5)/factorial(5-4)
120

They should all be 120. This also doesn't work for the pairs: (4,4), (5, 4), (5, 5), (6, 4), (6, 5), (6, 6), ....

CC: @sagetrac-sage-combinat

Component: combinatorics

Issue created by migration from https://trac.sagemath.org/ticket/4252
@saliola saliola added this to the sage-3.2 milestone Oct 7, 2008
@mwhansen
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mwhansen commented Oct 7, 2008

comment:1

This is a duplicate of #4213 which has been fixed in 3.1.3.

@mwhansen mwhansen removed this from the sage-3.2 milestone Oct 7, 2008
@mwhansen mwhansen closed this as completed Oct 7, 2008
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