.help isvector Aug85 "Surfit Package"
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NAME
isvector -- evaluate the fitted surface at a set of points
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SYNOPSIS
isvector (sf, x, y, zfit, npts)

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pointer	sf		# surface grid descriptor
real	x[npts]		# x array, 1 <= x[i] <= ncols
real	y[npts]		# y array, 1 <= y[i] <= nlines
real	zfit[npts]	# data values
int	npts		# number of data points
.fi
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ARGUMENTS
.ls sf    
Pointer to the surface grid descriptor structure.
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.ls x, y
Arrays of x and y values.
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.ls zfit
Array of fitted values.
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.ls npts
The number of points to be fit.
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DESCRIPTION
Fit the surface to an array of x and y values. ISVECTOR uses the coefficients
stored in the surface descriptor structure.
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NOTES
Checking for out of bounds x and y values is the responsibility of the
calling program.
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SEE ALSO
iseval
.endhelp