Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1993
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1993

[Date Index] [Thread Index] [Author Index]

Search the Archive

Splines for smoothing data

  • To: mathgroup at yoda.physics.unc.edu (Mathgroup mailing list)
  • Subject: Splines for smoothing data
  • From: David Harrison <harrison at faraday.physics.utoronto.ca>
  • Date: Tue, 29 Jun 1993 09:38:16 -0400

A common use of cubic splines in Physics is to smooth the data.  This
is, of course, very different from using them to 'connect the dots'
as in the NumericalMath`SplineFit` package with a Cubic option.

The sort of function I am seeking allows one to select any knots,
whether there happens to be a datapoint there or not, fit each segment
between the knots to a cubic polynomial in the independent variable,
and adjust the polynomials at the knot positions so they are continuous.
It is important that we are returned the sum-of-the-squares and the slope
at the knots since we will be doing a 'spline on spline' fit of the
slopes vs. the independent variable.

An example of such a program is the NAG routines E02BAF and E02BCF.

Does anybody have a Mathematica package that does this?  Failing that
a nice implementation of B-Splines would save me some coding.
--
David Harrison                             | "God doesn't play dice with the
Dept. of Physics, Univ. of Toronto         |   Universe!"  -- Einstein
Inet: harrison at faraday.physics.utoronto.ca |  "Stop telling God what to do."
Tel: 416-978-2977  Fax: 416-978-5848       |               -- Bohr





  • Prev by Date: Parser
  • Next by Date: Transient fitting/deconvolution
  • Previous by thread: Parser
  • Next by thread: Transient fitting/deconvolution