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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <math/gsurfit.h>
include "dgsurfitdef.h"
# GSZERO -- Procedure to zero the accumulators before doing
# a new fit in accumulate mode. The inner products of the basis functions
# are accumulated in the GS_NCOEFF(sf) ** 2
# array MATRIX, while
# the inner products of the basis functions and the data ordinates are
# accumulated in the NCOEFF(sf)-vector VECTOR.
procedure dgszero (sf)
pointer sf # pointer to surface descriptor
errchk mfree
begin
# zero the accumulators
switch (GS_TYPE(sf)) {
case GS_LEGENDRE, GS_CHEBYSHEV, GS_POLYNOMIAL:
GS_NPTS(sf) = 0
call aclrd (VECTOR(GS_VECTOR(sf)), GS_NCOEFF(sf))
call aclrd (MATRIX(GS_MATRIX(sf)), GS_NCOEFF(sf) ** 2)
# free the basis functions defined from previous calls to sfrefit
if (GS_XBASIS(sf) != NULL)
call mfree (GS_XBASIS(sf), TY_DOUBLE)
GS_XBASIS(sf) = NULL
if (GS_YBASIS(sf) != NULL)
call mfree (GS_YBASIS(sf), TY_DOUBLE)
GS_YBASIS(sf) = NULL
if (GS_WZ(sf) != NULL)
call mfree (GS_WZ(sf), TY_DOUBLE)
GS_WZ(sf) = NULL
default:
call error (0, "GSZERO: Unknown surface type.")
}
end
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