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Re: the competition's expm vs ours
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From: |
Jordi Gutiérrez Hermoso |
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Subject: |
Re: the competition's expm vs ours |
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Date: |
Tue, 2 Dec 2008 18:10:55 -0600 |
2008/12/1 Marco Caliari <address@hidden>:
> On my laptop, I got the following results for a 500x500 matrix:
>
> Octave 3.0.3 (with ATLAS): 4.3 seconds
> Octave 3.0.3, removing the extra steps: 4.0 seconds
> Matlab 7.6.0: 1.2 seconds
> Octave 3.0.3, rewriting in a better way the Pade' approximation (and with
> the extra steps): 3.7 seconds
>
> So, I don't think the extra steps produce the difference and they are
> suggested also in "The scaling and squaring method for the matrix
> exponential revisited" by N.J. Higham.
Hrm... Are you using sources that incorporate Jaroslav's indexing
improvements? I guess we could profile Octave to see where the actual
slowdown is instead of guessing...
- Jordi G. H.