From help-octave-request at bevo dot che dot wisc dot edu Fri Feb  7 09:29:47 2003
Subject: Re: 3d plotting, griddata and deluanayn
From: =?iso-8859-1?q?Jo=E3o=20Cardoso?= <jcard at fe dot up dot pt>
To: help-octave at bevo dot che dot wisc dot edu
Date: Fri, 7 Feb 2003 15:31:40 +0000

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 octave-forge/main/geometry/readme
| instructions
| for installing qhull.  I haven't tried yet with the most recent qhull
| release.
|
| Download the correct version of octave-forge (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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