matrix columnwise subtraction

2011 11 25
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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?

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Image Analyst
Image Analyst 2011-11-25

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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)

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Titus Edelhofer
Titus Edelhofer 2011-11-25
Small typo, to reproduce the example you need to subtract m from m1: m1MinusM = bsxfun(@minus, m1, m).
zozo
zozo 2011-11-26
thank you!

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