Mercurial > octave
view scripts/statistics/distributions/laplace_rnd.m @ 3922:38c61cbf086c
[project @ 2002-05-01 06:48:35 by jwe]
author | jwe |
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date | Wed, 01 May 2002 06:48:36 +0000 |
parents | e031284eea27 |
children | 22bd65326ec1 |
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## Copyright (C) 1995, 1996, 1997 Kurt Hornik ## ## This file is part of Octave. ## ## Octave is free software; you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 2, or (at your option) ## any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, write to the Free ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA ## 02111-1307, USA. ## -*- texinfo -*- ## @deftypefn {Function File} {} laplace_rnd (@var{r}, @var{c}) ## Return an @var{r} by @var{c} matrix of random numbers from the ## Laplace distribution. ## @end deftypefn ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: Random deviates from the Laplace distribution function rnd = laplace_rnd (r, c) if (nargin != 2) usage ("laplace_rnd (r, c)"); endif if (! (is_scalar (r) && (r > 0) && (r == round (r)))) error ("laplace_rnd: r must be a positive integer"); endif if (! (is_scalar (c) && (c > 0) && (c == round (c)))) error ("laplace_rnd: c must be a positive integer"); endif tmp = rand (r, c); rnd = ((tmp < 1/2) .* log (2 * tmp) - (tmp > 1/2) .* log (2 * (1 - tmp))); endfunction