Re: [Bug-gsl] Re: [bug #30947] Please, include fixed step size control object for ode suite

[Sergey B Kirpichev]

On 9/4/10, Tuomo Keskitalo <address@hidden> wrote:
> > Please explain, why this smaller step was attempted.  Where the step
> > size is decremented?
>
>  In ode-initval2/evolve.c starting from line 186. Failure of a step can be
> due to e.g. local error of the step being larger than desired error level
> (too large step size), approaching a singularity or discontinuity, or domain
> error in the user function.

I think, it's not the case.

> Whatever the reason, evolve_apply tries to advance with a smaller step size.

Where exactly it "tries"?  There is only one part of code (near line
210), which seems to be related to step size reduction.