Which is every column of a matrix multiplys a vector. Something like this:

Code: Select all

mat.colwise()  *= v;

If M is
M << 1, 2, 6, 9,
3, 1, 7, 2;
v is
v<<2, 3;

I want to get

2 4 12 18
9 3 21 6

in other word you want to scale each rows, so:

M = v.asDiagonal() * M;

btw, moving to the "array world" should work too:

M = M.array().colwise() * v.array();

Thanks a lot!