Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!mcvax!ukc!stl!pgh
From: pgh@stl.stc.co.uk (Peter Hamer)
Newsgroups: comp.lang.fortran
Subject: Re: splines
Message-ID: <581@acer.stl.stc.co.uk>
Date: Tue, 6-Oct-87 09:59:09 EDT
Article-I.D.: acer.581
Posted: Tue Oct  6 09:59:09 1987
Date-Received: Mon, 12-Oct-87 22:30:29 EDT
Reply-To: pgh@stl.UUCP (Peter Hamer)
Organization: STL,Harlow,UK.
Lines: 33


 Thanks for the additional information Allen. A method that might suit
 you is fitting a surface to each triangular finite element, selecting
 parameters so that the surfaces and their derivatives are continuous at
 their boundaries. 

Cannot be too much help with references; but look at acm TOMS Dec 84

pp440- Algorithm 624 Triangulation and interpolation of arbitarily
distributed points in the plane.

pp463- Computing contours by successive solution of quintic polynomial
equations.

pp473- Algorithm 626 TRICP A contour plotting program for triangular
meshes.

... these may give you some ideas, or even be directly useful.

If you don't already know about netlib, I strongly recommend Comms
ACM, May 87, pp403-, Distribution of mathematical software via
electronic mail.  This is a wonderful source of mathematical routines.
In particular, I believe it has both the above algorithms (in the TOMS
library), and the de Boor programs JEH Shaw referenced (in the PPPACK
library).

Good luck, e-mail me if you find any good programs.
.

-- 

Regards,
	  Peter Hamer  (pgh@stl   ...!mcvax!ukc!stl!pgh    +44-279-29531 x 3192)