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Topic: subtract vector from matrix rows without for loop
Replies: 13   Last Post: Jun 14, 2017 7:34 AM

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mike zander

Posts: 3,542
Registered: 11/29/05
Re: subtract vector from matrix rows without for loop
Posted: Nov 28, 2009 9:53 PM
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% Data
A = magic(3);
B = [ 1 2 3];

% Engine 1, good for large arrays when memory is an issue.
C = bsxfun(@minus,A,B);

% Engine 2, may be faster for small arrays.
C = A - B(ones(size(A,1),1),:);

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