How do I vectorize the following code?

Hi,

I'm having trouble vectorizing the following code. The result should be a matrix with an upper triangle.

data = 1:1:10;
nn = length(data);
for x = 1:nn
    for y = x:nn
        X(x,y) = (data(y) - data(x)) / data(x);
    end
end

All help gratefully received!

Answer 1

[Matt J]

X = triu(data(:)./data(:).' - 1)

[David]

Hi, Thanks for this. This doesn't replicate the loop answers. Note y = x:nn.

[Matt J]

Just reverse the slash,

 X = triu(data(:).\data(:).' - 1)

[David]

That does it! Many thanks.

[Matt J]

You're welcome, but please Accept-click the answer to signify that it solved your problem.