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[Bug-gsl] [bug #30947] Please, include fixed step size control object fo
Sergey B Kirpichev
[Bug-gsl] [bug #30947] Please, include fixed step size control object for ode suite
Sun, 01 May 2011 11:16:21 +0000
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Follow-up Comment #2, bug #30947 (project gsl):
> one important reason for the evolve level functions is to allow
> for variable step size.
No. Just to allow adaptive step size control. Why don't
consider the *evolve_apply with fixed step as just a special case?
> If you really require a fixed step size for the stepper level, then
> you can use the for loop around step_apply function shown in the manual.
Of cource, I can (it WAS noted in bugreport). Sometimes it's just not
convinient, e.g. to use _different loops_ for fixed and variable step sizes.
> Also, I'm afraid that using your cfxd may not guarantee the use of a
> fixed step size; also evolve_apply can change the step length,
> so you might have to have a function something like
> "evolve_apply_fixed_step_size" to do the job.
Why? fc_control_hadjust() always returns GSL_ODEIV_HADJ_NIL - there
is no reason to change step size.
See also thread in bug-gsl:
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