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       1                 :            : /*
       2                 :            :  * poly.h - poly class definitions and implementation
       3                 :            :  *
       4                 :            :  * Copyright (C) 2005 Stefan Jahn <stefan@lkcc.org>
       5                 :            :  *
       6                 :            :  * This is free software; you can redistribute it and/or modify
       7                 :            :  * it under the terms of the GNU General Public License as published by
       8                 :            :  * the Free Software Foundation; either version 2, or (at your option)
       9                 :            :  * any later version.
      10                 :            :  *
      11                 :            :  * This software is distributed in the hope that it will be useful,
      12                 :            :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14                 :            :  * GNU General Public License for more details.
      15                 :            :  *
      16                 :            :  * You should have received a copy of the GNU General Public License
      17                 :            :  * along with this package; see the file COPYING.  If not, write to
      18                 :            :  * the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
      19                 :            :  * Boston, MA 02110-1301, USA.
      20                 :            :  *
      21                 :            :  * $Id$
      22                 :            :  *
      23                 :            :  */
      24                 :            : 
      25                 :            : #ifndef __POLY_H__
      26                 :            : #define __POLY_H__
      27                 :            : 
      28                 :            : namespace qucs {
      29                 :            : 
      30                 :            : class poly
      31                 :            : {
      32                 :            :  public:
      33                 :            :   poly (nr_double_t _x, nr_double_t _y)
      34                 :            :     : x(_x), f0(_y) { f1 = f2 = 0; }
      35                 :          0 :   poly (nr_double_t _x, nr_double_t _f0, nr_double_t _f1)
      36                 :          0 :     : x(_x), f0(_f0), f1(_f1) { f2 = 0; }
      37                 :          0 :   poly (nr_double_t _x, nr_double_t _f0, nr_double_t _f1, nr_double_t _f2)
      38                 :          0 :     : x(_x), f0(_f0), f1(_f1), f2(_f2) { }
      39                 :          0 :   ~poly ()
      40                 :          0 :     { }
      41                 :            :   nr_double_t eval (nr_double_t _x) {
      42                 :            :     nr_double_t dx = _x - x; return f0 + dx * (f1 + dx * f2);
      43                 :            :   }
      44                 :            : 
      45                 :            :   nr_double_t x;  // x     - argument
      46                 :            :   nr_double_t f0; // f(x)  - value
      47                 :            :   nr_double_t f1; // f'(x) - 1st derivative
      48                 :            :   nr_double_t f2; // f"(x) - 2nd derivative
      49                 :            : };
      50                 :            : 
      51                 :            : } // namespace qucs
      52                 :            : 
      53                 :            : #endif /* __POLY_H__ */