Vectorizing Arithmetic Operations

问题

I am trying to improve the performance of my code by converting some iterations into matrix operations in Matlab. One of these is the following code and I need to figure out how can I avoid using loop in the operation.

Here gamma_ic & bow are two dimensional matrices. c & z are variables set from outer iterations.

for z=1:maxNumber,
    for c=1:K,
        n = 0;
        for y2=1:number_documents,
            n = n+(gamma_ic(y2,c)*bow(y2,z));
        end
        mu(z,c) = n / 2.3;
    end
end

Appreciate your assistance.

Edit. Added The loop for c and z. The iteration goes on till the maximum indices in gamma_ic & bow. Added mu which is another two dimensional matrix to show usage of n.

回答1:

This should work for you to get mu, which seems to be the desired output -

mu = bow(1:number_documents,1:maxNumber).'*gamma_ic(1:number_documents,1:K)./2.3

来源：https://stackoverflow.com/questions/26598046/vectorizing-arithmetic-operations