assiging values to matrix accrding to indexes using sub2ind

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

[Andrei Bobrov]

mn=size(MAT);    
MAT(sub2ind(mn,Z,X))=DATA;

Answer 1

[Honglei Chen]

Try accumarray

MAT = accumarray([Z X],DATA)

[Walter Roberson]

I would suggest

MAT = accumarray([Z X],DATA, [m n]);

as this version will create the correct output size even if the outermost indices do not happen to be used.

[Honglei Chen]

Thanks Walter, you are absolutely right. That's a good catch.

[Andrei Bobrov]

accumarray([Z(:),X(:)],DATA(:),[m n])

[Jonathan Ron]

tnx guys