.help issolve Aug85 "Surfit Package"
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NAME
issolve -- solve the surface
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SYNOPSIS
include <math/surfit.h>

issolve (sf, lines, nlines, ier)

.nf
pointer	sf		# surface grid descriptor
int	lines[nlines]	# surface grid line numbers, 1 <= lines[i] <= nlines
int	nlines		# number of lines
int	ier		# error code
.fi
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ARGUMENTS
.ls sf     
Pointer to the surface grid descriptor structure.
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.ls lines
The line number of surface grid lines to be included in the fit.
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.ls nlines
The number of surface grid lines to be fit.
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.ls ier      
Error code returned by the fitting routines. The options are OK, SINGULAR,
and NO_DEG_FREEDOM. If ier = SINGULAR the matrix is singular, ISSOLVE
will compute a solution to the normal equations but one or more of the
coefficients will be zero. If ier = NO_DEG_FREEDOM, too few data points
exist for a reasonable solution to be computed. ISSOLVE returns without
fitting the data.
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DESCRIPTION
ISSOLVE solves for the surface coefficients.
An error code is
returned by ISSOLVE if it is unable to solve the normal equations as
formulated.
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NOTES
It is the responsibility of the calling program to check for out of bounds
lines values.
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SEE ALSO
isinit, slzero, islfit, islrefit, islaccum, islresolve, isfree
.endhelp