Re: [Plplot-general] contour plot question

[Alan W. I. <ir...@be...>]

On 2004-08-04 17:57+0200 WH...@bf... wrote:

> hi list,
> i am looking for a way to plot isolines. so far i understand
> is the way plpoin3(). therefor you need z[x][y]. the problem
> is i have data for x=0...6000,y=0...9000. a simple field would
> become very expensive exspecialy if i have only 2500 point in total (uneven distributed).
>
> Is there a way to plot a "3D field" like plploin(N,x,y,z) ?
>

I may not properly understand your question, but I will try to answer
anyway.

To transform irregularly spaced data to a uniform grid take a look at
http://plplot.sourceforge.net/docbook-manual/plplot-html-5.3.1/plgriddata.html
for documentation and http://plplot.sourceforge.net/examples/demo21.php for
an example using this function.

After you have transformed your data to a uniform grid, then try
http://plplot.sourceforge.net/docbook-manual/plplot-html-5.3.1/plcont.html
to plot contours. http://plplot.sourceforge.net/examples/demo09.php shows
contour examples.

If, instead, you simply want to plot a 3D line in 3D perspective, have a
look at
http://plplot.sourceforge.net/docbook-manual/plplot-html-5.3.1/plline3.html
and http://plplot.sourceforge.net/examples/demo18.php.

Alan
__________________________
Alan W. Irwin
email: ir...@be...
phone: 250-727-2902

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the PLplot scientific plotting software
package (plplot.org), the Yorick front-end to PLplot (yplot.sf.net), the
Loads of Linux Links project (loll.sf.net), and the Linux Brochure Project
(lbproject.sf.net).
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