Re: [Help-gsl] BFGS iteration does not make any progress

[Brian Gough]

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.