[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: 3.1 status report
From: |
David Bateman |
Subject: |
Re: 3.1 status report |
Date: |
Thu, 17 Jul 2008 00:04:54 +0200 |
User-agent: |
Thunderbird 2.0.0.12 (X11/20080306) |
Jaroslav Hajek wrote:
> I see, however, a couple drawbacks:
> 1. most of GSL uses hard-coded double as the real type. Now that we
> have true single precision, this is really a big drawback. I don't
> reckon there are plans to change this state in GSL. And I can't see
> any good way out of this.
> 2. the "core" linear algebra operation of the MINPACK algorithms
> (trust-region Levenberg-Marquardt and Powell's hybrid method) is the
> QRP factorization. GSL has its own QRP code (as well as other linear
> algebra codes) and employs it here. I think, however, that LAPACK is
> fairly better.
To me these are both good reasons not to use GSL. What I thought we were
gaining with GSL was
* upto date and maintained code
* code that generally performed better
* code that returned valid results for a wider range of input values.
Though given the two points above I'm not sure GSL is worth it.
D.
- Re: 3.1 status report, (continued)
Re: 3.1 status report, Michael Goffioul, 2008/07/16
Re: 3.1 status report, dbateman, 2008/07/16
Re: 3.1 status report, Jaroslav Hajek, 2008/07/16