> we have encountered the following problem when plotting contourlines:
> set param
> set nosurface
> set view 0,0
> set contour
> set cntrparam levels discrete 0.05,0.1,0.5,1.0,1.5
> set cntrparam bspline #optional
> splot 'wave__.d' w l
> # see end of the text for file 'wave__.d'
> we find that the contourlines are not symmetric with
> respect to the horizontal x-axis, although
> the z numbers in 'wave__.d' are the same for positive and
> negative y value.
> (This applies to unix version 3.5 (pre 3.6)
> patchlevel beta 273
> and also to
> patchlevel beta 322
> under Linux and under HP-UX)
> Has anyone any idea why this goes wrong ?
> [data file deleted]
symmetric, in that if it passes through the data top to bottom, it
gets a different result than if it passes the other way.
I can imagine an algorithm that behaves this way, but I've not had
the time or patience to wade through the code to see how gnuplot's
contouring works, if it's relatively easily fixable or if it needs
a wholesale rewrite.
I know this doesn't really help :-(