Re: Re: [Plplot-general] contour plot question

[<WH...@bf...>]

hi alan,
looks interessting. i will try it.

The problem i have is a more geographic one. Asume you have samples
from all over alaska. now you want to plot the distribution.
Clearly you have vast streches with no data (sea, canada), then "clusters" from
easy accessable sites that define a minimum resolution and "normal"
data. (not exacly my problem but you will get the picture, i hope)

regards,
walter




- - - - - - - - - - - - - - Original Message - - - - - - - - - - - - - -
From: Alan W. Irwin <ir...@be...>
Subject: Re: [Plplot-general] contour plot question
Date: 08/04/04 18:38

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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