Re: How best to plot contours + explicit lines?

[Petr M. <mi...@ph...>]

> If what you want is to have all contours the same color,
> then the obvious syntax would be something like
>     set contour samecolor
>
> although surely there must be a better keyword.

>No "would be" needed --- this already exists, and it's called
>
>        unset clabel

Wow, I never used that! That's even not in any demo!

>Yes, that *is* definitely one of the top two contestants of most silly
>option name in all of gnuplot --- the other being 'set ticslevel'.

Indeed!


> > set contour
> > set cntrpar levels 30
> > splot x*x-y*y with line lc rgb "#000000"
> > splot x*x-y*y with line lc rgb "#000000"
> >
> > but it uses the whole color palette instead of a single color. Bug?
>
> I suppose it's a bug, although I honestly don't know what the
> expected behaviour would be.  If you start a contour series with
> a fixed linetype then it auto-increments line types (colors) for
> successive contour levels, right?  But if you start it off with
> an arbitrary color, as you did with 'lc rgb "#foo"', then how
> should it determine the color of the next contour level?

I think it should not cycle colors at all, and stay with the same color (aka
"unset clabel").

Strange -- in this script, the bug shows up again:
set contour
set cntrpar levels 30
unset clabel
splot x*x-y*y with line lt 1
splot x*x-y*y with line lc rgb "#000000"


---
PM