--- a +++ b/inst/@CatBlockMat/mtimes.m @@ -0,0 +1,66 @@ +% Matrix product A*B. +% +% p = mtimes(A,B) +% +% Return the matrix product between the CatBlockMat A and another matrix B. + +function p = mtimes(A,B) + +if size(A,2) ~= size(B,1) + error('Inner matrix dimensions must agree.'); +end + +if isa(A,'CatBlockMat') + + if A.dim == 1 + p = zeros(size(A,1),size(B,2)); + + for l=1:A.N + i = A.i(l)+1:A.i(l+1); + p(i,:) = A.B{l} * B; + end + else + for l=1:A.N + i = (A.i(l)+1) :A.i(l+1); + + % must use subsref explicetly + % subsref(B,S) = B(i,:) + % http://www.mathworks.com/support/solutions/en/data/1-18J9B/ + + S.type = '()'; + S.subs = {i, ':'}; + tmp = A.B{l} * subsref(B,S); + + if l==1 + p = tmp; + else + p = p + tmp; + end + end + end + +elseif isa(B,'CatBlockMat') && B.dim == 2 + p = zeros(size(A,1),size(B,2)); + + for l=1:B.N + j = B.i(l)+1:B.i(l+1); + p(:,j) = A * B.B{l}; + end +else + warning('divand:fullmat','use full matrices for product'); + p = full(A) * full(B); +end +% Copyright (C) 2014 Alexander Barth <a.barth@ulg.ac.be> +% +% 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 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 program; if not, see <http://www.gnu.org/licenses/>.