Optimization! Divide a vector by each element of another vector!

Dear all,

I would like to optimize my code which looks like this:

for n = 1:N
    prt1(n,:) = exp(exp1/n^2);
end

exp1 is a vector of (1,2e4) and N = 2e4.

As you see the loop above works fine but the problem is heavy computation which takes extremely long time. Is there any way that I can vectorize n? By that I need to divide each element of exp1 by the 1st element of n and then 2nd, 3rd, ... nth element of n.

Any hint is appreciated :)

All the best

PS: Any good source in general for the MATLAB optimization??

Answer 1

[Walter Roberson]

prt1 = bsxfun(@rdivide, exp1, (1:N).');

[M G]

Thanks Walter...