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Re: 3d plotting, griddata and deluanayn
From: 
João Cardoso 
Subject: 
Re: 3d plotting, griddata and deluanayn 
Date: 
Fri, 7 Feb 2003 15:31:40 +0000 
Useragent: 
KMail/1.4.3 
On Tuesday 04 February 2003 02:28, Paul Kienzle wrote:
 If you are on Windows, you will need to first figure out how to
 compile qhull for Windows. We haven't done so yet.

 If you are on unix, follow the octaveforge/main/geometry/readme
 instructions
 for installing qhull. I haven't tried yet with the most recent qhull
 release.

 Download the correct version of octaveforge (octave.sf.net) for your
 particular
 version of octave (the latest is for octave 2.1.40 I believe  if
 you are using
 something more recent, you will need to get the CVS version).

 ./configure
 make
 make install

 griddata does not work as quickly as I would like. Talk to the
 qhull author about how to improve it if it is not fast enough for
 you.
I don't think that Qhull is slow, slow is the searching of triangles in
tsearch.
I'm using Sakov's "nn" (natural neighbors) library
http://www.marine.csiro.au/~sakov/ that uses Lawson's "walking
triangle" algorithm to search for a triangle given a point. "nn" uses
"triangle", which not free software, but I have adapted it to work with
Qhull.
plgriddata() will soon be integrated into PLplot.
Joao

 Andrass Ziska Davidsen wrote:
 >However, I have found a function called griddata, which seems to do
 > what I want, but it in turn uses the function delaunayn, which I do
 > not have. I have managed to find a cc file on the repoitory, bit I
 > do not know how to compile it.

 
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Octave is freely available under the terms of the GNU GPL.
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