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annotate scripts/general/randperm.m @ 5171:dc706eb5be9f

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[project @ 2005-03-01 18:01:54 by jwe]
author jwe
date Tue, 01 Mar 2005 18:01:54 +0000
parents 22bd65326ec1
children 4c8a2e4e0717
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1 ## Copyright (C) 1998 John W. Eaton
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 2, or (at your option)
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8 ## any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, write to the Free
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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18 ## 02111-1307, USA.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} randperm (@var{n})
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22 ## Return a row vector containing a random permutation of the
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23 ## integers from 1 to @var{n}.
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24 ## @end deftypefn
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25
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26 ## Author: "James R. Van Zandt" <jrv@vanzandt.mv.com>
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27 ## Adapted-By: jwe
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28
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29 function retval = randperm (n)
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30
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31 if (nargin == 1 && isscalar (n) && floor (n) == n)
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32 if (n > 0)
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33 [junk, retval] = sort (rand (1, n));
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34 else
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35 error ("randperm: argument must be positive");
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36 endif
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37 else
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38 usage ("randperm (n)");
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39 endif
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40
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41 endfunction