#4252: Arrangements / PermutationsNK iterator is broken
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Reporter: saliola | Owner: mhansen
Type: defect | Status: new
Priority: major | Milestone: sage-3.2
Component: combinatorics | Keywords:
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{{{
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), ....
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4252>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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