matrix columnwise subtraction

I have the following matrix:

[ 1 2 3
  1 3 4
  4 5 6]

I need:

[ 0 -1 -2
  0 -2 -3
  0 -1 -2]

How can I do it?

Answer 1

[Image Analyst]

Try bsxfun:

% Generate sample data.
m = rand(3,5)
% Extract out the first column
m1 = m(:,1)
% Subtract first column from all the columns.
mMinusM1 = bsxfun(@minus,m,m1)

[Titus Edelhofer]

Small typo, to reproduce the example you need to subtract m from m1: m1MinusM = bsxfun(@minus, m1, m).

[zozo]

thank you!