I have a cell array of 100*8. Each cell contains N*24 matrix. I need to find the inter-class euclidian distance. But the error is coming: Subscripted assignment dimension mismatch.

k=1;
while k<100
    if(k==1)
    for m=1:99
        for n=1:8
            impsum(k,m,n)=pdist2(RetFet{1,n},RetFet{m+1,n},'euclidean');
        end
    end
    else
        for m=1:(k-1)
            for n=1:8
                impsum(k,m,n)=pdist2(RetFet{k,1},RetFet{m,n},'euclidean');
            end
        end
        for m=k:99
            for n=1:8
                impsum(k,m,n)=pdist2(RetFet{k,1},RetFet{m+1,n},'euclidean');
            end
        end          
    end
    k=k+1;
end

Answer 1

[Guillaume]

You're trying to assign a matrix (the result of pdist2) to a scalar ( impsum(k, m, n)). Of course, you're going to get a subscripted assignment mismatch.

Possibly, you meant

impsum{k,m,n} = ...

Or maybe you meant to calculate the sum of pdist2?

[rudresh]

I am using a 3-D matrix. According to you, should i use cell array for this.

[Guillaume]

I don't know what you should be using, but you can't stuff a 2D matrix into each cell of a 3D matrix. You can only put a single scalar into each cell.

So, either you meant to do something with the result of pdist2 to produce a scalar, or you need to put these 2D matrices into something else. Two possibilities: A cell array or a 5D matrix.:

impsum{k ,m, n} = some2Dmatrix
%or
impsum(k, m, n, :, :) = some2Dmatrix