.help gsaccum Aug85 "Gsurfit Package"
.ih
NAME
gsaccum -- accumulate a single data point into the fit
.ih
SYNOPSIS
include <math/gsurfit.h>

gsaccum (sf, x, y, weight, wtflag)

.nf
pointer	sf		# surface descriptor
real	x		# x value, xmin <= x <= xmax
real	y		# y value, ymin <= y <= ymax
real	z		# z value
real	weight		# weight
int	wtflag		# type of weighting
.fi
.ih
ARGUMENTS
.ls sf      
Pointer to the surface descriptor structure.
.le
.ls x, y
The x and y values.
.le
.ls z      
Data value.
.le
.ls weight
The weight assigned to the data point.
.le
.ls wtflag
Type of weighting. The options are WTS_USER and WTS_UNIFORM. If wtflag
equals WTS_USER the weight for each data point is supplied by the user.
If wtflag equals WTS_UNIFORM the routine sets the weight to 1.
.le
.ih
DESCRIPTION
GSACCUM calculates the non-zero basis functions for the given x and
y values, computes the contribution of each data point to the normal
equations and sums that contribution into the appropriate arrays and
vectors.
.ih
NOTES
Checking for out of bounds x and y values and INDEF valued data points is
the responsibility of the calling program.
.ih
SEE ALSO
gsacpts, gsfit, gsrefit
.endhelp