Subject: plotting problem with trigonometric functions
From: Oliver Kullmann
Date: Wed, 14 Mar 2012 19:46:25 +0000
How can I find out *which* gnuplot is called by
Maxima? Can Maxima ask "its" gnuplot to output
the version number?
Under "?? gnuplot" quite a number of possibilities show up,
but nothing tells me which gnuplot is used by Maxima?
Oliver
On Wed, Mar 14, 2012 at 12:22:12PM -0600, Robert Dodier wrote:
> Looks like a Gnuplot bug to me.
> This is enough to trigger it:
>
> $ cat /tmp/baz.data
>
> -1. 1.
> 0.7068965517241379 0.99999999999999989
> 1. 1.
>
> then in gunplot, issue: plot "/tmp/baz.data"
>
> $ gnuplot --version
> gnuplot 4.4 patchlevel 2
>
> I suppose Gnuplot is trying to find the range and getting
> mixed up somehow. Incidentally if all y-values are exactly the
> same it doesn't seem to have the same problem.
>
> I guess somebody should forward this to the Gnuplot team
> but I'm too lazy.
>
> best
>
> Robert Dodier
>
> On 3/14/12, Raymond Toy <toy.raymond at gmail.com> wrote:
> > On Wed, Mar 14, 2012 at 9:56 AM, Oliver Kullmann
> > <O.Kullmann at swansea.ac.uk>wrote:
> >
> >> I can confirm that behaviour, using
> >>
> >> Maxima version: 5.26.0
> >> Maxima build date: 1:35 12/20/2011
> >> Host type: x86_64-unknown-linux-gnu
> >> Lisp implementation type: ECL
> >> Lisp implementation version: 11.1.1
> >>
> >> Plotting just sec(x) or cos(x) is not a problem,
> >> but the product seems to run into an infinite loop.
> >>
> >
> > Maxima hangs and not gnuplot?
> >
> > If so, try changing the adapt_depth plot_option to 1 or 0 and see if that
> > helps.
> >
> > Ray
> >
--
Dr. Oliver Kullmann
Department of Computer Science
College of Science, Swansea University
Faraday Building, Singleton Park
Swansea SA2 8PP, UK
http://cs.swan.ac.uk/~csoliver/