% Copyright (C) 2008 Jaroslav Hajek <firstname.lastname@example.org>
% This file is part of OctaveForge.
% OctaveForge 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 of the License, 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 software; see the file COPYING. If not, see
% function benchmark_dtmm (m, n, nvec)
% Dense transposed matrix-matrix and matrix-vector multiplication benchmark.
% This is to test the "compound operators" feature introduced in Octave.
% m = row dimension of matrices
% n = col dimension of matrices
% nvec = number of vector op repeats
% time_tmm = Time for A'*B (A,B m-by-n matrices)
% time_smm = Time for A'*A
% time_mtm = Time for A*B' (A,B n-by-m matrices)
% time_msm = Time for A*A'
% time_tmv = Time for A'*v nvec-times (A m-by-n matrix)
% time_mtv = Time for v*A' nvec-times (A m-by-n matrix)
function results = benchmark_dtmm (m, n, nvec)
benchutil_default_arg ('m', 40192);
benchutil_default_arg ('n', 150);
benchutil_default_arg ('nvec', 100);
A = rand (m, n);
B = rand (m, n);
tic; C = A'*B; time_tmm = toc;
tic; C = A'*A; time_smm = toc;
A = A';
B = B';
tic; C = A*B'; time_mtm = toc;
tic; C = A*A'; time_msm = toc;
A = A';
v = rand (m, 1);
c = A'*v;
time_tmv = toc;
v = rand (1, n);
c = v*A';
time_mtv = toc;