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diff --git a/math/curfit/doc/cvset.hlp b/math/curfit/doc/cvset.hlp new file mode 100644 index 00000000..5eb79f30 --- /dev/null +++ b/math/curfit/doc/cvset.hlp @@ -0,0 +1,56 @@ +.help cvset Nov84 "Curfit Package" +.ih +NAME +cvset -- input fit parameters derived external to CURFIT +.ih +SYNOPSIS +include <math/curfit.h> + +cvset (cv, curve_type, xmin, xmax, coeff, ncoeff) + +.nf +pointer cv # pointer to curve descriptor +int curve_type # functional form of the curve to be fitted +real xmin, xmax # minimum and maximum x values +real coeff[ncoeff] # coefficient array +int ncoeff # number of coefficients +.fi +.ih +ARGUMENTS +.ls cv +Pointer to curve descriptor structure. Returned by CVSET. +.le +.ls curve_type +Type of curve to be input. Must be one of LEGENDRE, CHEBYSHEV, SPLINE3 +or SPLINE1. +.le +.ls xmin, xmax +The minimum and maximum data or fitted x values. The Legendre and +Chebyshev polynomials are assumed to be normalized over this range. +For the cubic and linear spline functions, the data range (xmax - xmin) is +divided into (ncoeff - 3) and (ncoeff - 1) evenly spaced polynomial pieces +respectively. +.le +.ls coeff +Array containing the coefficients. Must have at least 7 + order +elements, where order has the same meaning as the order parameter set in CVINIT. +.le +.ls ncoeff +The number of coefficients. For polynomial functions, ncoeff +equals 1 plus the order of the polynomial, e.g. a second order +polynomial curve will have three coefficients. For the cubic +and linear spline the number of polynomial pieces fit are +(ncoeff - 3) and (ncoeff - 1) respectively. +.le +.ih +DESCRIPTION +CVSET returns cv the pointer to the curve descriptor and +stores the curve parameters in the CURFIT structure ready for +use by CVEVAL or CVVECTOR. +.ih +NOTES +The splines are assumed to have been fit in the least squares sense. +.ih +SEE ALSO +cvsave +.endhelp |