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A faster sum
From: |
Keith Goodman |
Subject: |
A faster sum |
Date: |
Sat, 21 May 2005 07:35:33 -0700 |
Matrix multiplication is sometimes a lot faster than matrix addition.
So instead of sum(x,1) and sum(x,2) you can use ones(1,size(x,1))*x
and x*ones(size(x,2),1).
What are the pros and cons of using this method for 2D matrices in
Octave's built-in sum function?
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- A faster sum,
Keith Goodman <=
- Re: A faster sum, Victor Eijkhout, 2005/05/21
- Re: A faster sum, Keith Goodman, 2005/05/21
- Re: A faster sum, Mike Miller, 2005/05/21
- Re: A faster sum, Victor Eijkhout, 2005/05/21
- Re: A faster sum, Keith Goodman, 2005/05/21
- Re: A faster sum, Victor Eijkhout, 2005/05/21