Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!usc!rutgers!att!mcdchg!usenet
From: cline@cs.utexas.edu (Alan Cline)
Newsgroups: comp.newprod
Subject: Curve and Surface Fitting Package
Keywords: Curve fitting, surface fitting, data smoothing, tension splines
Message-ID: <28814@mcdchg.chg.mcd.mot.com>
Date: 28 Nov 89 18:06:46 GMT
Sender: usenet@mcdchg.chg.mcd.mot.com
Followup-To: poster
Organization: U. Texas CS Dept., Austin, Texas
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Approved: usenet@mcdchg.UUCP

A new version of the software package FITPACK has been placed  on
netlib.  FITPACK  contains code for curve and surface fitting and
smoothing in various space dimensions and geometries. The  under-
lying  functional  form employed is the tension spline, which al-
lows the reproduction of such properties of data  as  positivity,
monotonicity,  and  convexity.   The package began development in
1972.

A small subset of the 1979 version of FITPACK was placed on  net-
lib  several  years ago. That version had only a few subprograms,
is antiquated, and its usage is discouraged. The  new  subset  of
FITPACK to be distributed by netlib is taken from the most recent
edition of the entire package.  (In terms of characters, lines of
code,  and number of subprograms this subset is about 20% of FIT-
PACK. However, these 25 subprograms  account  for  about  95%  of
usages  of  the package.) What has been omitted in the subset are
such capabilities as:
  1. Automatic tension determination,
  2. Derivatives,  arclengths,  and  enclosed  areas  for  planar
     curves,
  3. Three dimensional curves,
  4. Special surface fitting using equispacing assumptions,
  5. Surface fitting in annular, wedge, polar,  toroidal,  lunar,
     and spherical geometries,
  6. B-splines-in-tension generation and usage,
  7. General surface fitting in three dimensional space.

Questions about the package can be addressed to Alan Cline,  Com-
puter  Sciences  Department,  The  University of Texas at Austin,
Austin, TX 78712 USA. Telephone inquiries should use  (512)  471-
9717  and  e-mail is cline@cs.utexas.edu.  Interested parties can
obtain the entire package on disk or tape  from  Pleasant  Valley
Software,  8603  Altus  Cove,  Austin TX 78759 (USA) at a cost of
$495 US. A 340 page manual is available for $30 US per copy.  The
package includes examples and machine-readable documentation.


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