Mercurial > hg > octave-jordi
view src/DLD-FUNCTIONS/__pchip_deriv__.cc @ 7016:93c65f2a5668
[project @ 2007-10-12 06:40:56 by jwe]
author | jwe |
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date | Fri, 12 Oct 2007 06:41:26 +0000 |
parents | 6bbf56a9718a |
children | a1dbe9d80eee |
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/* Copyright (C) 2002 Kai Habel This file is part of Octave. Octave is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <http://www.gnu.org/licenses/>. */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include "defun-dld.h" #include "error.h" #include "gripes.h" #include "oct-obj.h" #include "utils.h" #include "f77-fcn.h" extern "C" { F77_RET_T F77_FUNC (dpchim, DPCHIM) (const octave_idx_type& n, double *x, double *f, double *d, const octave_idx_type &incfd, octave_idx_type *ierr); } // Wrapper for SLATEC/PCHIP function DPCHIM to calculate the derivates // for piecewise polynomials. DEFUN_DLD (__pchip_deriv__, args, , "-*- texinfo -*-\n\ @deftypefn {Loadable Function} {} __pchip_deriv__ (@var{x}, @var{y})\n\ Undocumented internal function.\n\ @end deftypefn") { octave_value retval; const int nargin = args.length (); if (nargin == 2) { ColumnVector xvec (args(0).vector_value ()); Matrix ymat (args(1).matrix_value ()); octave_idx_type nx = xvec.length (); octave_idx_type nyr = ymat.rows (); octave_idx_type nyc = ymat.columns (); if (nx != nyr) { error ("number of rows for x and y must match"); return retval; } ColumnVector dvec (nx), yvec (nx); Matrix dmat (nyr, nyc); octave_idx_type ierr; const octave_idx_type incfd = 1; for (int c = 0; c < nyc; c++) { for (int r = 0; r < nx; r++) yvec(r) = ymat(r,c); F77_FUNC (dpchim, DPCHIM) (nx, xvec.fortran_vec (), yvec.fortran_vec (), dvec.fortran_vec (), incfd, &ierr); if (ierr < 0) { error ("DPCHIM error: %i\n", ierr); return retval; } for (int r=0; r<nx; r++) dmat(r,c) = dvec(r); } retval = dmat; } return retval; }