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70 lines
1.8 KiB
Plaintext
70 lines
1.8 KiB
Plaintext
NAME
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randperm - randomly permute a list or matrix
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SYNOPSIS
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randperm(x)
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TYPES
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x list or matrix
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return same as x
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DESCRIPTION
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For a list or matrix x, randperm(x) returns a copy of x in which
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the elements have been randomly permuted. The value of x is not
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changed.
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This function uses the rand() subtractive 100 shuffle pseudo-random
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number generator.
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EXAMPLE
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; A = list(1,2,2,3,4)
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; randperm(A)
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list (5 elements, 5 nonzero):
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[[0]] = 4
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[[1]] = 1
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[[2]] = 2
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[[3]] = 3
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[[4]] = 2
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; randperm(A)
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list (5 elements, 5 nonzero):
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[[0]] = 2
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[[1]] = 1
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[[2]] = 4
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[[3]] = 2
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[[4]] = 3
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LIMITS
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none
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LINK LIBRARY
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none
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SEE ALSO
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comb, fact, rand, perm
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## Copyright (C) 1999-2006,2023 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## Under source code control: 1995/07/10 02:09:31
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## File existed as early as: 1995
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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