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annotate scripts/statistics/distributions/stdnormal_rnd.m @ 7017:a1dbe9d80eee

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[project @ 2007-10-12 21:27:11 by jwe]
author jwe
date Fri, 12 Oct 2007 21:27:37 +0000
parents 93c65f2a5668
children be55736a0783
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1 ## Copyright (C) 1995, 1996, 1997, 1998, 2000, 2002, 2004, 2005, 2006,
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2 ## 2007 Kurt Hornik
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} stdnormal_rnd (@var{r}, @var{c})
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22 ## @deftypefnx {Function File} {} stdnormal_rnd (@var{sz})
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23 ## Return an @var{r} by @var{c} or @code{size (@var{sz})} matrix of
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24 ## random numbers from the standard normal distribution.
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25 ## @end deftypefn
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26
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27 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
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28 ## Description: Random deviates from the standard normal distribution
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29
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30 function rnd = stdnormal_rnd (r, c)
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31
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32 if (nargin != 1 && nargin != 2)
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33 print_usage ();
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34 endif
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35
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36 if (nargin == 2)
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37 if (! (isscalar (r) && (r > 0) && (r == round (r))))
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38 error ("stdnormal_rnd: r must be a positive integer");
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39 endif
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40 if (! (isscalar (c) && (c > 0) && (c == round (c))))
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41 error ("stdnormal_rnd: c must be a positive integer");
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42 endif
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43 sz = [r, c];
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44 else
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45 if (isscalar (r) && (r > 0))
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46 sz = [r, r];
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47 elseif (isvector(r) && all (r > 0))
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48 sz = r(:)';
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49 else
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50 error ("stdnormal_rnd: r must be a positive integer or vector");
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51 endif
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52 endif
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53
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54 rnd = randn (sz);
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55
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56 endfunction