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From: yorkall@hubcap.UUCP
Newsgroups: comp.lang.fortran
Subject: Re: splines
Message-ID: <462@hubcap.UUCP>
Date: Wed, 16-Sep-87 22:25:13 EDT
Article-I.D.: hubcap.462
Posted: Wed Sep 16 22:25:13 1987
Date-Received: Sat, 19-Sep-87 07:45:20 EDT
References: <442@hubcap.UUCP> <578@acer.stl.stc.co.uk>
Organization: Clemson University, Clemson, SC
Lines: 32
Keywords: 2-d

In article <578@acer.stl.stc.co.uk>, pgh@stl.stc.co.uk (Peter Hamer) writes:
> However, *why* do you want to interpolate? Is it as a first step in
> some more complicated process (eg plotting contour lines), do you
> really want to smooth rather than interpolate between accurately known
> points, do you know the points on a fixed grid, why cannot you just
> calculate the function, do you need continuity of derivatives?
> 
> In other words, if can you explain your problem more fully we may be
> able to provide more help.
> -- 
> 
> Regards,
> 	  Peter Hamer  (pgh@stl   ...!mcvax!ukc!stl!pgh    +44-279-29531 x 3192)

Yes, I have realized since then that I should have provided more information.
Here is the background.  I have a Finite Element Mesh with irregular boundaries
and a relativley smooth distribution of several field variables.  As to save
from doing several other local steps which can be complicated, I would 
like to fit a surface to the data and be able to interpolate between the 
data points.                      

The reason for this is that the code we are running simulates the forging
process and the mesh gets highly distorted which will eventually make the 
solution diverge, but just make it innaccurate before this.  When we 
rezone the mesh, move nodal points to make the elements less distorted, 
we need to also transfer the data in the best way possible.  We are trying
least square fit which is efficient, but may not be accurate enough.

Thanks for any ideas!

Allen York    UUCP: !gatech!hubcap!yorkall
          INTERNET: yorkall@hubcap.clemson.edu