I'm executing image scrambling code but im getting index exceeds matrix dimension error.

code i ws exceuting is:

iter=10;
[m,n]= size(W2);
out=zeros();
n=n-1;
for j=1:length(iter)
    for y=0:n
        for x=0:n
            P=[1 1;1 2]*[x;y];
            out(mod(P(2),m)+1,mod(P(1),m)+1)=W2(y+1,x+1);
        end
    end
    W3=out;
end

Answer 1

[Guillaume]

There are several issues with your code.

out = zeros()

creates an out matrix of size 1x1. Although it's not so critical as matlab will automatically (but slowly!) grow it in the loop, surely that's not the size you intended. Most likely you meant

out = zeros(size(W2));

The main problem with your code is that you're mixing up your m and your n. For a start, instead of using meaningless variable names such as m and n how about using useful names such as height and width:

 [height, width] = size(W2);

Then of course, x goes from 0 to width, and y goes from 0 to height (instead of both to n == width as you've written). Similarly, the modulus across each dimension needs to be a different variable not m == height in both case.