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+.help cvfit Jun84 "Curfit Package"
+.ih
+NAME
+cvfit -- fit a curve to a set of data values
+.ih
+SYNOPSIS
+cvfit (cv, x, y, weight, npts, wtflag, ier)
+
+.nf
+pointer	cv		# curve descriptor
+real	x[]		# array of x values
+real	y[]		# array of y values
+real	weight[]	# array of weights
+int	npts		# number of data points
+int	wtflag		# type of weighting
+int	ier		# error code
+.fi
+.ih
+ARGUMENTS
+.ls cv    
+Pointer to the curve descriptor structure.
+.le
+.ls x    
+Array of x values.
+.le
+.ls y
+Array of y values
+.le
+.ls weight
+Array of weights
+.le
+.ls wtflag
+Type of weighting. The options are WTS_USER, WTS_SPACING and
+WTS_UNIFORM. If wtflag = WTS_USER individual weights for each data point
+are supplied by the calling program and points with zero-valued weights are
+not included in the fit. If wtflag = WTS_UNIFORM, all weights are assigned
+values of 1. If wtflag = WTS_SPACING, the weights are set equal to the
+difference between adjacent data points. In order to correctly use the
+WTS_SPACING option the data must be sorted in x.
+.le
+.ls ier
+Error code for the fit. The options are OK, SINGULAR and
+NO_DEG_FREEDON. If ier = SINGULAR, the numerical routines will compute a
+solution but one or more of the coefficients will be
+zero. If ier = NO_DEG_FREEDOM, there were too few data points to solve the
+matrix equations and the routine returns without fitting the data.
+.le
+.ih
+DESCRIPTION
+CVFIT zeroes the matrix and vectors, calculates the non-zero basis functions,
+calculates the contribution
+of each data point to the normal equations and accumulates it into the
+appropriate array and vector elements. The Cholesky factorization of the
+data array is computed and the coefficients of the fitting function are
+calculated.
+.ih
+NOTES
+Checking for out of bounds x values is the responsibility of the user.
+.ih
+SEE ALSO
+cvrefit, cvaccum, cvsolve, cvchofac, cvcholsv
+.endhelp