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.help iseval Apr85 "Surfit Package"
.ih
NAME
iseval -- evaluate the fitted surface at x and y
.ih
SYNOPSIS
y = iseval (sf, x, y)
.nf
pointer sf # surface descriptor
real x # x value, 1 <= x <= ncols
real y # y value, 1 <= y <= nlines
.fi
.ih
ARGUMENTS
.ls sf
Pointer to the surface descriptor structure.
.le
.ls x, y
X and y values at which the surface is to be evaluated.
.le
.ih
DESCRIPTION
Evaluate the surface at the specified value of x and y. ISEVAL is a real
valued function which returns the fitted value.
.ih
NOTES
ISEVAL uses the coefficient array stored in the surface descriptor structure.
Checking for out of bounds x and y values is the responsibility of the calling
program.
.ih
SEE ALSO
isvector
.endhelp
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