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From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.physics
Subject: Re: 2-d spline (non-interpolating) wanted
Message-ID: <390@brl-tgr.ARPA>
Date: Fri, 6-Dec-85 10:56:28 EST
Article-I.D.: brl-tgr.390
Posted: Fri Dec  6 10:56:28 1985
Date-Received: Sat, 7-Dec-85 21:21:39 EST
References: <218@fas.ri.cmu.edu>
Organization: Ballistic Research Lab
Lines: 8

> I need a spline subroutine (any language) for smoothing a function of
> two variables f(x,y).

DeBoor's "A Practical Guide to Splines" has such an algorithm,
which IMSL lifted and called something like ISSCU.  This code
does not work well unless the data are properly scaled.  I'll
mail the requestor a copy of my C code that implements this,
including scaling, assuming I can figure out his mail address.