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Re: contour

From: Daniel J Sebald
Subject: Re: contour
Date: Mon, 24 Jan 2005 13:08:05 -0600
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20041020

John W. Eaton wrote:

On 24-Jan-2005, Daniel J Sebald <address@hidden> wrote:

| Anyone recall the issue with the comment below?:
| | -- Function File: contour (X, Y, Z, N)
|      Make a contour plot of the three-dimensional surface described by
|      Z.  Someone needs to improve `gnuplot''s contour routines before
|      this will be very useful.
| | What is the problem with gnuplot's contour?

The problem I was thinking of when I wrote that comment was that
gnuplot implements contour plots as a special type of 3D plot instead
of a 2D plot.  So even though the final graph has only two dimensions,
it has a much different appearance than other 2D plots produced by
gnuplot and it is somewhat harder to combine a contour plot with
general 2D data.

Oh that. Yeah. There's been plenty discussion on the gnuplot list about the layout of 3D plots. (In particular, many think the margin space is excessive in 3D plots.) I'm one of the stronger advocates for makeing 2D/3D more consistent and, more specifically, pretty much the same code. Slowly, code has been organized in that direction, but I don't think it will be until this summer that someone goes through the effort to cleanup the layout code.

I think it would also be nice if it could embed the contour levels in
the plot lines (I recall that there were plotting packages from the
mid-eighties (or even before) that could do this).  Maybe gnuplot has
this feature now?  I haven't checked.

Not familiar with that, but I'll see what contour can do now.


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