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Re: 2nd: sparse matrices
From: |
Andy Adler |
Subject: |
Re: 2nd: sparse matrices |
Date: |
Mon, 26 Apr 2004 11:00:19 -0400 (EDT) |
On Mon, 26 Apr 2004, john popeye wrote:
> Summary:
> Sparse matrices are a special case of the mathematical
> object "matrix". This special case was introduced due
> to the simple fact that you can be orders of magnitude
> more efficient when you apply certain restrictions on
> it.
> My recommendation is implementing such a feature makes
> only sense if you do not restrict yourself by the way
> you implement it. Focus on what you could achieve with
> it and for what is was designed (LARGEness). (you do
> not buy an expensive car when all you do is moving it
> forward and backward in the garage a few meters, do
> you?)
Do you actually USE sparse matrices?
The Matlab sparse implementation (most of which is
offered by octave-forge) gives almost exactly what
you want, as well as some special features to do
things on sparse that you don't normally do on
full matrices.
Summary:
What's wrong with the Matlab approach and what
do you propose we do differntly?
Andy
rand seed, Daniel J Sebald, 2004/04/27