adding matrix to every column in other matrix

hi all i have two matrix a 16x1024 and b 16x1 how i can adding b to every column in a ? thanks

Answer 1

[Cedric]

 b_ext = repmat(b, 1, size(a, 2)) ;
 c = a + b_ext ;

Answer 2

[James Tursa]

bsxfun(@plus,a,b)

[Cedric]

+1

I don't understand why it is slower than REPMAT though in cases where size(a,2) is not too large .. I thought that it would kill repmat when I tested.

[James Tursa]

I haven't tested bsxfun much, but I am not surprised by the timing. I have read many accounts here for various problems and several times it has come up that explicit formulations in one way or another beat bsxfun for speed. For small problems like this one the timing is likely irrelevant anyway.