From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001 From: Joseph Hunkeler Date: Wed, 8 Jul 2015 20:46:52 -0400 Subject: Initial commit --- math/gsurfit/gsfitr.x | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 math/gsurfit/gsfitr.x (limited to 'math/gsurfit/gsfitr.x') diff --git a/math/gsurfit/gsfitr.x b/math/gsurfit/gsfitr.x new file mode 100644 index 00000000..f5321969 --- /dev/null +++ b/math/gsurfit/gsfitr.x @@ -0,0 +1,35 @@ +# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc. + +include +include "gsurfitdef.h" + +# GSFIT -- Procedure to solve the normal equations for a surface. +# The inner products of the basis functions are calculated and +# accumulated into the GS_NCOEFF(sf) ** 2 matrix MATRIX. +# The main diagonal of the matrix is stored in the first row of +# MATRIX followed by the remaining non-zero diagonals. +# The inner product +# of the basis functions and the data ordinates are stored in the +# GS_NCOEFF(sf)-vector VECTOR. The Cholesky factorization of MATRIX +# is calculated and stored in CHOFAC. Forward and back substitution +# is used to solve for the GS_NCOEFF(sf)-vector COEFF. + +procedure gsfit (sf, x, y, z, w, npts, wtflag, ier) + +pointer sf # surface descriptor +real x[npts] # array of x values +real y[npts] # array of y values +real z[npts] # data array +real w[npts] # array of weights +int npts # number of data points +int wtflag # type of weighting +int ier # ier = OK, everything OK + # ier = SINGULAR, matrix is singular, 1 or more + # coefficients are 0. + # ier = NO_DEG_FREEDOM, too few points to solve matrix + +begin + call gszero (sf) + call gsacpts (sf, x, y, z, w, npts, wtflag) + call gssolve (sf, ier) +end -- cgit