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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <math/gsurfit.h>
include "gsurfitdef.h"
# GSVECTOR -- Procedure to evaluate the fitted surface at an array of points.
# The GS_NCOEFF(sf) coefficients are stored in the
# vector COEFF.
procedure gsvector (sf, x, y, zfit, npts)
pointer sf # pointer to surface descriptor structure
real x[ARB] # x value
real y[ARB] # y value
real zfit[ARB] # fits surface values
int npts # number of data points
begin
# evaluate the surface along the vector
switch (GS_TYPE(sf)) {
case GS_POLYNOMIAL:
if (GS_XORDER(sf) == 1) {
call rgs_1devpoly (COEFF(GS_COEFF(sf)), y, zfit, npts,
GS_YORDER(sf), GS_YMAXMIN(sf), GS_YRANGE(sf))
} else if (GS_YORDER(sf) == 1) {
call rgs_1devpoly (COEFF(GS_COEFF(sf)), x, zfit, npts,
GS_XORDER(sf), GS_XMAXMIN(sf), GS_XRANGE(sf))
} else
call rgs_evpoly (COEFF(GS_COEFF(sf)), x, y, zfit, npts,
GS_XTERMS(sf), GS_XORDER(sf), GS_YORDER(sf), GS_XMAXMIN(sf),
GS_XRANGE(sf), GS_YMAXMIN(sf), GS_YRANGE(sf))
case GS_CHEBYSHEV:
if (GS_XORDER(sf) == 1) {
call rgs_1devcheb (COEFF(GS_COEFF(sf)), y, zfit, npts,
GS_YORDER(sf), GS_YMAXMIN(sf), GS_YRANGE(sf))
} else if (GS_YORDER(sf) == 1) {
call rgs_1devcheb (COEFF(GS_COEFF(sf)), x, zfit, npts,
GS_XORDER(sf), GS_XMAXMIN(sf), GS_XRANGE(sf))
} else
call rgs_evcheb (COEFF(GS_COEFF(sf)), x, y, zfit, npts,
GS_XTERMS(sf), GS_XORDER(sf), GS_YORDER(sf), GS_XMAXMIN(sf),
GS_XRANGE(sf), GS_YMAXMIN(sf), GS_YRANGE(sf))
case GS_LEGENDRE:
if (GS_XORDER(sf) == 1) {
call rgs_1devleg (COEFF(GS_COEFF(sf)), y, zfit, npts,
GS_YORDER(sf), GS_YMAXMIN(sf), GS_YRANGE(sf))
} else if (GS_YORDER(sf) == 1) {
call rgs_1devleg (COEFF(GS_COEFF(sf)), x, zfit, npts,
GS_XORDER(sf), GS_XMAXMIN(sf), GS_XRANGE(sf))
} else
call rgs_evleg (COEFF(GS_COEFF(sf)), x, y, zfit, npts,
GS_XTERMS(sf), GS_XORDER(sf), GS_YORDER(sf), GS_XMAXMIN(sf),
GS_XRANGE(sf), GS_YMAXMIN(sf), GS_YRANGE(sf))
default:
call error (0, "GSVECTOR: Unknown surface type.")
}
end
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