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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:  dmult (a, B)
+##
+## If a is a vector of length rows (B), return diag (a) * B (but
+## computed much more efficiently).
+  
+## Author:  KH <Kurt.Hornik@ci.tuwien.ac.at>
+## Description:  Rescale the rows of a matrix
+  
+function M = dmult (a, B)
+  
+  if (nargin != 2)
+    usage ("dmult (a, B)");
+  endif
+  
+  s = size (a);
+  if ((min (s) > 1) || (max (s) != rows (B)))
+    error ("dmult:  a must be a vector of length rows (B)");
+  endif
+  
+  M = (reshape (a, max (s), 1) * ones (1, columns (B))) .* B;
+  
+endfunction