Diffing "mrowb" and "Try n"

[h,w]=size(a)
[h w]=size(a)
b=0
for s=1:min(h,w)
    for i=1:h-s
            for j=1:w-s
    l=a(i:s+i,j:s+j)
    if min(l)==max(l) & sum(l(:))>b, b=sum(l(:)),end; 
end
end
end