3D matrix subtraction

I have the following loop. The problem is I cannot get different values for NSSST as i and j changes

clear i j

for i=1:12

for j=1:12:324

NSSST=SST(:,:,j)-SSST(:,:,i);

j=j+1;

end

i=i+1;

end

end

Answer 1

[Image Analyst]

First of all, the clear is not necessary at all. Secondly you don't need to increment i and j because the for loops do that automatically for you. Third, you're not indexing NSSST so you're just overwriting a scalar every iteration. Maybe you want:

for i = 1 : 12
    for j = 1 : 12 : 324
        NSSST(i, j) = SST(:,:,j) - SSST(:,:,i);
    end
end

[Torsten]

@Image Analyst

But you don't get scalars, but 2d matrices as results from the subtraction ...

Maybe something like

count = 0;
for i = 1 : 12
    for j = 1 : 12 : 324
        count = count + 1;
        NSSST(:,:,count) = SST(:,:,j) - SSST(:,:,i);
    end
end

[Thishan Dharshana]

Thanks a lot. The answer with "count" is what I wanted.