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quick syntax question for saving run time
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I have the following:
m1 = rand(5,5)
m2 = rand(5,5)
m3 = rand(5,5)
m4 = rand(5,5)
m3D = cat(3, m1, m2, m3, m4);
% Find the min and a map of what matrix it occurred in.
[min2DImage matrixWhereItOccurs] = min(m3D, [], 3)
Now I would like to have accumlation array where I update that array by adding one to the 3rd dimension with index referenced from matrixWhereItOccurs
sz = sz(m3D);
accum_arr = zeros(sz(1),sz(2),sz(3)
Let's say matrixWhereItOccurs(2,3)=4, then accumm_arr(2,3,4)=accum_arr(2,3,4)+1; I want to do this for ALL elements now without going into loop as in my work the arrays are huge.Could you please help? Thanks
Answers (1)
Honglei Chen
on 18 Sep 2012
Edited: Honglei Chen
on 18 Sep 2012
ind = sub2ind(sz,repmat((1:sz(1))',1,sz(2)),repmat(1:sz(2),sz(1),1),...
matrixWhereItOccurs);
accum_arr(ind(:)) = accum_arr(ind(:))+1;
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