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Software Resources

GCVSPL: Spline Smoothing & Differentiation, GGLPEX: Extrapolation, QuickSAND: Smoothing and Differentiation, BioProc: Analog data processing.

Herman J. Woltring

GCVSPL is a Fortran package for spline smoothing and differentiation, by the late Herman J. Woltring. The methods were described in Woltring HJ (1986) A FORTRAN package for generalized, cross-validatory spline smoothing and differentiation. Adv. Engng. Softw. 8:104-113. Woltring has shown that spline smoothing is equivalent to a double Butterworth filter (see Release Notes). The differences are that with splines it is possible to process data with unequal sampling intervals and the boundary conditions are well defined. The original subroutine package is available, as well as versions for C and Matlab programmers. Also some front-end programs for UNIX and PC.

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A front-end program in Fortran 77 (last updated April 12, 2000). The program is interactive and self-explanatory. Tested on UNIX (Sun and SGI) and Windows NT.

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A version of GCVSPL in the C language.

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A version of GCVSPL in the C language.

ChunXiang Tian

A Matlab MEX interface for the GCVSPL package.

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A Matlab MEX interface for the GCVSPL package.

Tony Reina

A Matlab MEX interface for the GCVSPL and SPLDER packages based on Dwight Meglan's C Code.

Giannis Giakas

Software that uses a linear prediction method to extrapolate data.

Jeff Walker

Quick Smoothing And Numerical Differentiation for Power Macintosh. This software has numerous algorithms for smoothing and differentiating noisy data, including the Woltring spline routines, Butterworth filters, Wiener filters, and more.

(link out of date - http://usm.maine.edu/~walker/software.html)

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A program to read and display Kistler, APAS and other file formats. Includes algorithms for smoothing and ensemble averaging of signals.

(link out of date - http://isbweb.org/software/bioproc)