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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <math/gsurfit.h>
include "gsurfitdef.h"
# GSRESTORE -- Procedure to restore the surface fit stored by GSSAVE
# to the surface descriptor for use by the evaluating routines. The
# surface parameters, surface type, xorder (or number of polynomial
# pieces in x), yorder (or number of polynomial pieces in y), xterms,
# xmin, xmax and ymin and ymax, are stored in the first
# eight elements of the real array fit, followed by the GS_NCOEFF(sf)
# surface coefficients.
procedure gsrestore (sf, fit)
pointer sf # surface descriptor
real fit[ARB] # array containing the surface parameters and
# coefficients
int surface_type, xorder, yorder, order
real xmin, xmax, ymin, ymax
begin
# allocate space for the surface descriptor
call calloc (sf, LEN_GSSTRUCT, TY_STRUCT)
xorder = nint (GS_SAVEXORDER(fit))
if (xorder < 1)
call error (0, "GSRESTORE: Illegal x order.")
yorder = nint (GS_SAVEYORDER(fit))
if (yorder < 1)
call error (0, "GSRESTORE: Illegal y order.")
xmin = GS_SAVEXMIN(fit)
xmax = GS_SAVEXMAX(fit)
if (xmax <= xmin)
call error (0, "GSRESTORE: Illegal x range.")
ymin = GS_SAVEYMIN(fit)
ymax = GS_SAVEYMAX(fit)
if (ymax <= ymin)
call error (0, "GSRESTORE: Illegal y range.")
# set surface type dependent surface descriptor parameters
surface_type = nint (GS_SAVETYPE(fit))
switch (surface_type) {
case GS_LEGENDRE, GS_CHEBYSHEV, GS_POLYNOMIAL:
GS_NXCOEFF(sf) = xorder
GS_XORDER(sf) = xorder
GS_XMIN(sf) = xmin
GS_XMAX(sf) = xmax
GS_XRANGE(sf) = real(2.0) / (xmax - xmin)
GS_XMAXMIN(sf) = - (xmax + xmin) / real(2.0)
GS_NYCOEFF(sf) = yorder
GS_YORDER(sf) = yorder
GS_YMIN(sf) = ymin
GS_YMAX(sf) = ymax
GS_YRANGE(sf) = real(2.0) / (ymax - ymin)
GS_YMAXMIN(sf) = - (ymax + ymin) / real(2.0)
GS_XTERMS(sf) = GS_SAVEXTERMS(fit)
switch (GS_XTERMS(sf)) {
case GS_XNONE:
GS_NCOEFF(sf) = GS_NXCOEFF(sf) + GS_NYCOEFF(sf) - 1
case GS_XHALF:
order = min (xorder, yorder)
GS_NCOEFF(sf) = GS_NXCOEFF(sf) * GS_NYCOEFF(sf) - order *
(order - 1) / 2
case GS_XFULL:
GS_NCOEFF(sf) = GS_NXCOEFF(sf) * GS_NYCOEFF(sf)
}
default:
call error (0, "GSRESTORE: Unknown surface type.")
}
# set remaining curve parameters
GS_TYPE(sf) = surface_type
# allocate space for the coefficient array
GS_XBASIS(sf) = NULL
GS_YBASIS(sf) = NULL
GS_MATRIX(sf) = NULL
GS_CHOFAC(sf) = NULL
GS_VECTOR(sf) = NULL
GS_COEFF(sf) = NULL
GS_WZ(sf) = NULL
call malloc (GS_COEFF(sf), GS_NCOEFF(sf), TY_REAL)
# restore coefficient array
call amovr (fit[GS_SAVECOEFF+1], COEFF(GS_COEFF(sf)), GS_NCOEFF(sf))
end
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