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a=[2 2 1;1 2 3;1 1 1];  
b=[11 2 3 3 4 1;2 3 3 4 1 5;2 7 12 22 11 11;21 22 11 3 4 5;7 8 6 2 1 2;4 5 3 32 1 21];
[ma, na] = size(a);
[mb, nb] = size(b);
a(ma*mb-1, na*nb-1) = 0;
b(ma*mb-1, na*nb-1) = 0;
c=ifft2(fft2(a).*fft2(b));
c1=c(1:ma+mb-1,1:na+nb-1);
c2=conv2(a,b);
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