Why would you want to use any loop at all? For example, if A is an mxn matrix, and V is a vector of size mx1, then consider what does this do:
At least, if you are using release R2016b or later.
Earlier releases would use bxfun...
B = bsxfun(@rdivide,A,V);
Still pretty easy. If V is a row vector, then similar things apply.
So unless this is homework, why would you bother using a loop at all? And if it is homework, then why not try something? (And tell us honestly that it is your homework.) Show what you would think of doing, and you might get some advice on how to fix it. And you never know, you might even get it right yourself.