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/*$Id: m_spline.h,v 26.83 2008/06/05 04:46:59 al Exp $ -*- C++ -*-
* Copyright (C) 2001 Albert Davis
* Author: Albert Davis <aldavis@gnu.org>
*
* This file is part of "Gnucap", the Gnu Circuit Analysis Package
*
* This program 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, or (at your option)
* any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*------------------------------------------------------------------
* piecewise polynomial interpolation
* Constructor args:
* table : a vector of xy pairs, all of the data points.
* d0, dn: boundary conditions -- value of the first derivative at boundaries.
* order : order of interpolating polynomial, must be in {0, 1, 2, 3}.
*
* Outside the range, the result is linearly extrapolated with slope d0, dn.
* ("clamped" splines)
*
* If d0 or dn is set to NOT_INPUT, it is a "natural" spline, with the
* derivative being determined by the data.
* See any numerical analysis text for explanation.
*/
//testing=trivial 2006.07.17
#ifndef M_SPLINE_H
#define M_SPLINE_H
#include "u_parameter.h"
/*--------------------------------------------------------------------------*/
class FPOLY1;
/*--------------------------------------------------------------------------*/
class INTERFACE SPLINE {
private:
int _n;
double* _x;
double* _f0;
double* _f1;
double* _f2;
double* _f3;
int _order;
double _d0;
void construct_order_3(double* h, double d0, double dn);
void construct_order_2(double* h, double d0, double dn);
void construct_order_1(double* h, double d0, double dn);
public:
SPLINE(const std::vector<DPAIR>& table,
double d0, double dn, int order);
SPLINE(const std::vector<std::pair<PARAMETER<double>,PARAMETER<double> > >& table,
double d0, double dn, int order);
~SPLINE();
FPOLY1 at(double x)const;
};
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
#endif
// vim:ts=8:sw=2:noet:
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