a 2D version
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% mtimesx_sparse does sparse matrix multiply of two inputs
%******************************************************************************
%
% MATLAB (R) is a trademark of The Mathworks (R) Corporation
%
% Function: mtimesx_sparse
% Filename: mtimesx_sparse.m
% Programmer: James Tursa
% Version: 1.00
% Date: September 27, 2009
% Copyright: (c) 2009 by James Tursa, All Rights Reserved
%
% This code uses the BSD License:
%
% Redistribution and use in source and binary forms, with or without
% modification, are permitted provided that the following conditions are
% met:
%
% * Redistributions of source code must retain the above copyright
% notice, this list of conditions and the following disclaimer.
% * Redistributions in binary form must reproduce the above copyright
% notice, this list of conditions and the following disclaimer in
% the documentation and/or other materials provided with the distribution
%
% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
% POSSIBILITY OF SUCH DAMAGE.
%
%--
%
% mtimesx_sparse is a helper function for mtimesx and is not intended to be called
% directly by the user.
%
% ---------------------------------------------------------------------------------------------------------------------------------
function result = mtimesx_sparse(a,transa,b,transb)
if( transa == 'N' )
if( transb == 'N' )
result = a * b;
elseif( transb == 'G' )
result = a * conj(b);
elseif( transb == 'T' )
result = a * b.';
else
result = a * b';
end
elseif( transa == 'G' )
if( transb == 'N' )
result = conj(a) * b;
elseif( transb == 'G' )
result = conj(a) * conj(b);
elseif( transb == 'T' )
result = conj(a) * b.';
else
result = conj(a) * b';
end
elseif( transa == 'T' )
if( transb == 'N' )
result = a.' * b;
elseif( transb == 'G' )
result = a.' * conj(b);
elseif( transb == 'T' )
result = a.' * b.';
else
result = a.' * b';
end
else
if( transb == 'N' )
result = a' * b;
elseif( transb == 'G' )
result = a' * conj(b);
elseif( transb == 'T' )
result = a' * b.';
else
result = a' * b';
end
end
end