International Society of Biomechanics
Gold sponsor

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

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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.

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.