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+## 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:  geometric_rnd (p [, r, c])
+##
+## geometric_rnd (p) returns a matrix of random samples from the
+## geometric distribution with parameter p.  The size of the matrix is
+## the size of p.
+##
+## geometric_rnd (p, r, c) returns an r by c matrix of random samples
+## from the geometric distribution with parameter p, which must be a
+## scalar or of size r by c.
+  
+## Author:  KH <Kurt.Hornik@ci.tuwien.ac.at>
+## Description:  Random deviates from the geometric distribution
+  
+function rnd = geometric_rnd (p, r, c)
+
+  if (nargin == 3)
+    if ( !(is_scalar (r) && (r > 0) && (r == round (r))) )
+      error ("geometric_rnd:  r must be a positive integer");
+    endif
+    if ( !(is_scalar (c) && (c > 0) && (c == round (c))) )
+      error ("geometric_rnd:  c must be a positive integer");
+    endif
+    [retval, p] = common_size (p, zeros (r, c));
+    if (retval > 0)
+      error (strcat("geometric_rnd:  ",
+		    "p must be scalar or of size ",
+		    sprintf ("%d by %d", r, c)));
+    endif
+  elseif (nargin != 1)
+    usage ("geometric_rnd (p [, r, c])");
+  endif
+  
+  [r, c] = size (p);
+  s = r * c;
+  p = reshape (p, 1, s);
+  rnd = zeros (1, s);
+  
+  k = find (!(p >= 0) | !(p <= 1));
+  if (any (k))
+    rnd(k) = NaN * ones (1, length (k));
+  endif
+  
+  k = find (p == 0);
+  if (any (k))
+    rnd(k) = Inf * ones (1, length (k));
+  endif
+  
+  k = find ((p > 0) & (p < 1));
+  if (any (k))
+    rnd(k) = floor (log (rand (1, length (k))) ./ log (1 - p(k)));
+  endif
+  
+  rnd = reshape (rnd, r, c);
+  
+endfunction