## Copyright (C) 1995, 1996, 1997 Kurt Hornik ## ## This program 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. ## ## This program 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 this file. If not, write to the Free Software Foundation, ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ## usage: laplace_pdf (x) ## ## For each element of x, compute the probability density function (PDF) ## at x of the Laplace distribution. ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: PDF of the Laplace distribution function pdf = laplace_pdf (x) if (nargin != 1) usage ("laplace_pdf (x)"); endif [r, c] = size (x); s = r * c; x = reshape (x, 1, s); pdf = zeros (1, s); k = find (isnan (x)); if any (k) pdf(k) = NaN * ones (1, length (k)); endif k = find ((x > -Inf) & (x < Inf)); if any (k) pdf(k) = exp (- abs (x(k))) / 2; endif pdf = reshape (pdf, r, c); endfunction

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