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% convolve() - convolve two matrices (normalize by the sum of convolved
% elements to compensate for border effects).
%
% Usage:
% >> r = convolve( a, b );
%
% Inputs:
% a - first input vector
% b - second input vector
%
% Outputs:
% r - result of the convolution
%
% Author: Arnaud Delorme, CNL / Salk Institute, 2001
%
% See also: conv2(), conv()
% Copyright (C) 2001 Arnaud Delorme, Salk Institute, arno@salk.edu
%
% 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, write to the Free Software
% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
function R = convolve( A, B )
% size of B must be odd
% convolve A and B (normalize by the sum of convolved elements)
% -------------------------------------------------------------
R = zeros( size(A) );
for index = 1:length(A)
sumconvo = 0;
for indexB = 1:length(B)
indexconvo = indexB-1-round(length(B)/2);
indexA = index + indexconvo+1;
if indexA > 0 & indexA <= length(A)
R(index) = R(index) + B(indexB)*A(indexA);
sumconvo = sumconvo + B(indexB);
end;
end;
R(index) = R(index) / sumconvo;
end;
return;
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