[issue4816] Patch of itertools.{combinations, permutations} for empty combinations
Raymond Hettinger
report at bugs.python.org
Thu Jan 8 00:26:42 CET 2009
Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:
Summary of functions/definitions expected to return a number:
r>n r<0 Source
--------- ---------- ------------------------------
error error MS Excel PERMUT() and COMBIN()
error error HP32SII nPr and nCr
undefined undefined CRC Combinatoric definitions
undefined undefined Handbook of Mathematics and Computational Science
undefined undefined Wolfram:
http://mathworld.wolfram.com/Permutation.html
zero zero http://en.wikipedia.org/wiki/Choose_function
undefined undefined http://en.wikipedia.org/wiki/Combination
undefined undefined http://en.wikipedia.org/wiki/Permutation
zero undefined Knuth's choose function in Concrete Mathematics
zero zero GAP's nrCombinations()
Summary for tools that return the individual subsets:
r>n r<0 Source
--------- ---------- ------------------------------
emptylist error Mathematica
emptylist unknown Magma
emptylist error GAP Combinations
emptylist emptylist GAP Arrangements
emptylist emptylist Sage Combinations
emptylist error Sage Permutations
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