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[Help-gsl] Possible bug in gsl_odeiv2_step_bsimp

From: ali franco
Subject: [Help-gsl] Possible bug in gsl_odeiv2_step_bsimp
Date: Sat, 15 Oct 2011 13:58:38 +1300

Dear all,

I have a parameter defined as

struct parameter{ double wave_num;
                          bool  partial;
                          int count;

I pass this parameter and the Jacobian to gsl_odeiv2_system and every thing
works fine the first time around. But if I immediately call the solver again
the integration fails. I am pretty sure it is a bug in step_bsimp because
the error does not appear with other solvers. For example
gsl_odeiv2_step_msbdf or for that matter even if I use gsl_odeiv2_step_rk8pd
(which is not really recommended for stiff problems) every thing works just

So I am reporting that with a parameter defined like above and on the second
and third calls to gsl_odeiv2_step_bsimp it fails.  gsl_odeiv2_step_msbdf
works just fine, which lead me to conclude that bsimp has a bug.

Can someone please say something about which is the preffered stiff solver?
bsimp or msbdf?

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