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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
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