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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <math/gsurfit.h>
include "dgsurfitdef.h"
# GSSUB -- Procedure to subtract two surfaces. The surfaces
# must be the same type and the fit must cover the same range of data in x
# and y. This is a special function.
procedure dgssub (sf1, sf2, sf3)
pointer sf1 # pointer to the first surface
pointer sf2 # pointer to the second surface
pointer sf3 # pointer to the output surface
int i, ncoeff, order, maxorder1, maxorder2, maxorder3
int nmove1, nmove2, nmove3
pointer sp, coeff, ptr1, ptr2, ptr3
bool fpequald()
int dgsgeti()
begin
# test for NULL surface
if (sf1 == NULL && sf2 == NULL) {
sf3 = NULL
return
} else if (sf1 == NULL) {
ncoeff = dgsgeti (sf2, GSNSAVE)
call smark (sp)
call salloc (coeff, ncoeff, TY_DOUBLE)
call gssave (sf2, Memd[coeff])
call amulkd (Memd[coeff], -1.0d0, Memd[coeff], ncoeff)
call gsrestore (sf3, Memd[coeff])
call sfree (sp)
return
} else if (sf2 == NULL) {
call gscopy (sf1, sf3)
return
}
# test that function type is the same
if (GS_TYPE(sf1) != GS_TYPE(sf2))
call error (0, "GSSUB: Incompatable surface types.")
# test that mins and maxs are the same
if (! fpequald (GS_XMIN(sf1), GS_XMIN(sf2)))
call error (0, "GSADD: X ranges not identical.")
if (! fpequald (GS_XMAX(sf1), GS_XMAX(sf2)))
call error (0, "GSADD: X ranges not identical.")
if (! fpequald (GS_YMIN(sf1), GS_YMIN(sf2)))
call error (0, "GSADD: Y ranges not identical.")
if (! fpequald (GS_YMAX(sf1), GS_YMAX(sf2)))
call error (0, "GSADD: Y ranges not identical.")
# allocate space for the pointer
call calloc (sf3, LEN_GSSTRUCT, TY_STRUCT)
# copy parameters
GS_TYPE(sf3) = GS_TYPE(sf1)
switch (GS_TYPE(sf3)) {
case GS_LEGENDRE, GS_CHEBYSHEV, GS_POLYNOMIAL:
GS_NXCOEFF(sf3) = max (GS_NXCOEFF(sf1), GS_NXCOEFF(sf2))
GS_XORDER(sf3) = max (GS_XORDER(sf1), GS_XORDER(sf2))
GS_XMIN(sf3) = GS_XMIN(sf1)
GS_XMAX(sf3) = GS_XMAX(sf1)
GS_XRANGE(sf3) = GS_XRANGE(sf1)
GS_XMAXMIN(sf3) = GS_XMAXMIN(sf1)
GS_NYCOEFF(sf3) = max (GS_NYCOEFF(sf1), GS_NYCOEFF(sf2))
GS_YORDER(sf3) = max (GS_YORDER(sf1), GS_YORDER(sf2))
GS_YMIN(sf3) = GS_YMIN(sf1)
GS_YMAX(sf3) = GS_YMAX(sf1)
GS_YRANGE(sf3) = GS_YRANGE(sf1)
GS_YMAXMIN(sf3) = GS_YMAXMIN(sf1)
if (GS_XTERMS(sf1) == GS_XTERMS(sf2))
GS_XTERMS(sf3) = GS_XTERMS(sf1)
else if (GS_XTERMS(sf1) == GS_XFULL || GS_XTERMS(sf2) == GS_XFULL)
GS_XTERMS(sf3) = GS_XFULL
else
GS_XTERMS(sf3) = GS_XHALF
switch (GS_XTERMS(sf3)) {
case GS_XNONE:
GS_NCOEFF(sf3) = GS_NXCOEFF(sf3) + GS_NYCOEFF(sf3) - 1
case GS_XHALF:
order = min (GS_XORDER(sf3), GS_YORDER(sf3))
GS_NCOEFF(sf3) = GS_NXCOEFF(sf3) * GS_NYCOEFF(sf3) - order *
(order - 1) / 2
default:
GS_NCOEFF(sf3) = GS_NXCOEFF(sf3) * GS_NYCOEFF(sf3)
}
default:
call error (0, "GSADD: Unknown curve type.")
}
# set pointers to NULL
GS_XBASIS(sf3) = NULL
GS_YBASIS(sf3) = NULL
GS_MATRIX(sf3) = NULL
GS_CHOFAC(sf3) = NULL
GS_VECTOR(sf3) = NULL
GS_COEFF(sf3) = NULL
GS_WZ(sf3) = NULL
# calculate the coefficients
call calloc (GS_COEFF(sf3), GS_NCOEFF(sf3), TY_DOUBLE)
# set up the line counters.
maxorder1 = max (GS_XORDER(sf1) + 1, GS_YORDER(sf1) + 1)
maxorder2 = max (GS_XORDER(sf2) + 1, GS_YORDER(sf2) + 1)
maxorder3 = max (GS_XORDER(sf3) + 1, GS_YORDER(sf3) + 1)
# add in the first surface.
ptr1 = GS_COEFF(sf1)
ptr3 = GS_COEFF(sf3)
nmove1 = GS_NXCOEFF(sf1)
nmove3 = GS_NXCOEFF(sf3)
do i = 1, GS_NYCOEFF(sf1) {
call amovd (COEFF(ptr1), COEFF(ptr3), nmove1)
ptr1 = ptr1 + nmove1
ptr3 = ptr3 + nmove3
switch (GS_XTERMS(sf1)) {
case GS_XNONE:
nmove1 = 1
case GS_XHALF:
if ((i + GS_XORDER(sf1) + 1) > maxorder1)
nmove1 = nmove1 - 1
case GS_XFULL:
;
}
switch (GS_XTERMS(sf3)) {
case GS_XNONE:
nmove3 = 1
case GS_XHALF:
if ((i + GS_XORDER(sf3) + 1) > maxorder3)
nmove3 = nmove3 - 1
case GS_XFULL:
;
}
}
# subtract the second surface.
ptr2 = GS_COEFF(sf2)
ptr3 = GS_COEFF(sf3)
nmove2 = GS_NXCOEFF(sf2)
nmove3 = GS_NXCOEFF(sf3)
do i = 1, GS_NYCOEFF(sf2) {
call asubd (COEFF(ptr3), COEFF(ptr2), COEFF(ptr3), nmove2)
ptr2 = ptr2 + nmove2
ptr3 = ptr3 + nmove3
switch (GS_XTERMS(sf2)) {
case GS_XNONE:
nmove2 = 1
case GS_XHALF:
if ((i + GS_XORDER(sf2) + 1) > maxorder2)
nmove2 = nmove2 - 1
case GS_XFULL:
;
}
switch (GS_XTERMS(sf3)) {
case GS_XNONE:
nmove3 = 1
case GS_XHALF:
if ((i + GS_XORDER(sf3) + 1) > maxorder3)
nmove3 = nmove3 - 1
case GS_XFULL:
;
}
}
end
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