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Re: [Help-gsl] BFGS iteration does not make any progress
From: |
Brian Gough |
Subject: |
Re: [Help-gsl] BFGS iteration does not make any progress |
Date: |
Wed, 27 Apr 2011 17:33:10 +0100 |
User-agent: |
Wanderlust/2.15.6 (Almost Unreal) Emacs/23.2 Mule/6.0 (HANACHIRUSATO) |
At Wed, 13 Apr 2011 21:23:03 +0200,
Hannes Bretschneider wrote:
> The only parameter that I can tweak are the initial step size and the
> accuracy of the line minimization ingsl_multimin_fdfminimizer_set
> (gsl_multimin_fdfminimizer * s, gsl_multimin_function_fdf * fdf, const
> gsl_vector * x, double step_size, double tol). Trying different values
> there has a small effect (sometimes the algorithm moves a little bit),
> but I can't find any values that actually make the algorithm move
> around.
>
> Thanks for any suggestions!
Hi. If you didn't find the solution yet the best thing is to send a
complete program that can be compiled and shows the problem. Without
that it's difficult to guess. The test suite exercises all the
minimisers on some non-trivial problems so it should work and if it
does not it might be a bug.