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assiging values to matrix accrding to indexes using sub2ind

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Jonathan Ron
Jonathan Ron 2012-8-21
I have 3 data sets, two with coordinates and one with data with the length of n
with a loop I would assign the data in this way
MAT=zeros(m,n);
for i=1:n
MAT(Z(i),X(i))=MAT(Z(i),X(i))+DATA(i);
end
I want to do it without a loop since
what I am trying to do is something like
MAT=zeros(m,n);
mn=size(MAT);
MAT(sub2ind(mn,Z,X))=MAT(sub2ind(mn,Z,X))+DATA;
any one has an idea how to make it properly and efficiently?
cheers

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Honglei Chen
Honglei Chen 2012-8-21
编辑：Honglei Chen 2012-8-21
Try accumarray
MAT = accumarray([Z X],DATA)
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