[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: A faster sum
From: |
Keith Goodman |
Subject: |
Re: A faster sum |
Date: |
Sat, 21 May 2005 13:19:32 -0700 |
So does it make sense to modify the built-in function sum to use
matrix multiplication? For now, I'm using these two functions for
sum(x,1) and sum(x,2) in loops with lots and lots of iterations:
function y = sum1(x)
y = ones(1,size(x,1))*x;
function y = sum2(x)
y = x*ones(size(x,2),1);
-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.
Octave's home on the web: http://www.octave.org
How to fund new projects: http://www.octave.org/funding.html
Subscription information: http://www.octave.org/archive.html
-------------------------------------------------------------
- A faster sum, Keith Goodman, 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, Mike Miller, 2005/05/21
- Re: A faster sum, Victor Eijkhout, 2005/05/21
- Re: A faster sum,
Keith Goodman <=
- Re: A faster sum, Victor Eijkhout, 2005/05/21
- Re: A faster sum, Mike Miller, 2005/05/21
- Re: A faster sum, John W. Eaton, 2005/05/21