Re: [Plplot-general] problem building win-tk, help needed

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

On 2003-09-11 08:49-0500 Herng-Jeng Jou wrote:

> BTW, it is my understanding that Plplot constructs contour plot only from
> gridded data, not from ungridded data.

That's an easy question to answer.  For 5.2.1, plgriddata gives us a powerful
capability to transform from ungridded data to the gridded data required for
the PLplot routines that actually plot.

From the 5.2.1 announcement at
http://plplot.sourceforge.net/announce-plplot-5.2.1.html:

"plgriddata. Generate grid data for 3D plots from irregularly sampled data."

"3D" here should be interpreted in its broadest sense; any plot (contour, 3D
perspective, shade, 3D shade, etc.) which involves 3D data. plgriddata is
documented in
http://plplot.sourceforge.net/resources/docbook-manual/plplot-html-5.2.1.cvs.20030828/plgriddata.html.
One example of its use is given in example 21 which involves 3D perspective
plots and 3D shaded plots, but it should be easy to adapt example/c/x21c.c
for contoured plots as well.

We should thank Joao Cardoso for donating the plgriddata code to the PLplot
project.

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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