csa
Bivariate Cubic Spline approximation library + standalone utility
Version 0.05

Copyright 2002 CSIRO Marine Research
GPO 1538 Hobart
TAS 7001
Australia
Please send comments and bugs to Pavel.Sakov@csiro.au

There is no warranty whatsoever.  Use at your own risk. 

These code may be freely redistributed under the condition that the copyright 
notices are not removed. You may distribute modified versions of this code 
UNDER THE CONDITION THAT THIS CODE AND ANY MODIFICATIONS MADE TO IT IN THE 
SAME FILE REMAIN UNDER COPYRIGHT OF CSIRO, BOTH SOURCE AND OBJECT CODE ARE 
MADE FREELY AVAILABLE WITHOUT CHARGE, AND CLEAR NOTICE IS GIVEN OF THE 
MODIFICATIONS.

To compile, run:

configure
make
(make install)

Apart from the `csa' library, this code contains `csabathy' -- an 
approximation utility based on `csa'. 

For a quick test, see examples/*/README.

Acknowledgments:

*The algorithm used is described in paper by J. Haber, F. Zeilfelder, O.Davydov
and H.-P. Seidel, Smooth approximation and rendering of large scattered data
sets, in  ``Proceedings of IEEE Visualization 2001'' (Th.Ertl, K.Joy and 
A.Varshney, Eds.), pp.341-347, 571, IEEE Computer Society, 2001. 
http://www.uni-giessen.de/www-Numerische-Mathematik/davydov/VIS2001.ps.gz
http://www.math.uni-mannheim.de/~lsmath4/paper/VIS2001.pdf.gz

*The singular value decomposition code was borrowed from "Numerical Recipes in
 C".

Good luck!
Pavel Sakov