Question

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How do I divide the rows of a matrix by different values in MATLAB (array division)

I have a matrix A (size MxN) in Matlab and a Vector b with M rows and now I want to divide all elemtens in the i-th row of A by the i-th entry in b like a(i,:)/b(i) but I really don’t want to use this sort since I than use a for-loop and I definitly need a FAST solution!
Could anybody help out? Thanks!

Edit: Somehow I just came up with it after posting… My solution is bsxfun(@rdivide, [1 1; 2 2; 3 3], [2 2 6]'), do you think that’s a good and fast one?

Answer 1

You want to use bsxfunc :

bsxfun(@rdivide,A,B)

http://www.mathworks.com/help/techdoc/ref/bsxfun.html