Re: [Maxima-discuss] rkf45 share

[Eric B. <ej...@gm...>]

Michel, that agrees with my reading as well.

Thanks,
Eric

On Wed, Jan 18, 2017 at 10:03 AM Michel Talon <ta...@lp...>
wrote:

> Le 18/01/2017 à 15:46, Michel Talon a écrit :
> > First b line
> > 0.1185185185185185 0 0.5189863547758284 0.5061314903420167 −0.18
> > 0.03636363636363636
> > I don't know where these numbers appear, the last one is in truc_error.
> >
> > second b line
> > 0.1157407407407407 0 0.5489278752436647 0.5353313840155945 <-- 46 bfloat
> > -0.2  0
>
> In fact i have seen in
> https://en.wikipedia.org/wiki/Runge%E2%80%93Kutta_methods
> that to estimate the error one substracts the two b lines. But then
> 0.1185185185185185-0.1157407407407407=0.0027777777777..
> 0.5189863547758284-0.5489278752436647=- 0.0299415204678..
> 0.5061314903420167-0.5353313840155945=- 0.02919989367357789 etc.
> which are all the numbers  appearing in trunc_errors.
> So i think one can safely say that rkf45.mac is correct.
>
>
> --
> Michel Talon
>
>
>
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, SlashDot.org! http://sdm.link/slashdot
> _______________________________________________
> Maxima-discuss mailing list
> Max...@li...
> https://lists.sourceforge.net/lists/listinfo/maxima-discuss
>