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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
回答(1 个)
Honglei Chen
2012-9-18
编辑:Honglei Chen
2012-9-18
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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