include/e_aux.h

   1 /*$Id: e_aux.h,v 26.83 2008/06/05 04:46:59 al Exp $ -*- C++ -*-
   2  * Copyright (C) 2001 Albert Davis
   3  * Author: Albert Davis <aldavis@gnu.org>
   4  *
   5  * This file is part of "Gnucap", the Gnu Circuit Analysis Package
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  *------------------------------------------------------------------
  22  * helper functions, etc., that sort of belong to circuit elements
  23  */
  24 //testing=script 2007.07.13
  25 #ifndef E_AUX_H
  26 #define E_AUX_H
  27 #include "e_node.h"
  28 /*--------------------------------------------------------------------------*/
  29 template <class T>
  30 T port_impedance(const node_t& n1, const node_t& n2,
  31                  BSMATRIX<T>& mat, const T& parallel)
  32 {
  33   T* zapit = new T[mat.size()+2];
  34
  35   for (int ii = 0;  ii < mat.size()+2;  ++ii) {
  36     zapit[ii] = 0.;
  37   }
  38   if (n1.m_() != 0) {
  39     zapit[n1.m_()] =  1.;
  40   }else{untested();
  41   }
  42   if (n2.m_() != 0) {untested();
  43     zapit[n2.m_()] = -1.;
  44   }else{
  45   }
  46
  47   mat.fbsub(zapit);
  48   T raw_z = zapit[n1.m_()] - zapit[n2.m_()];
  49   delete [] zapit;
  50   return (parallel != 0.)
  51     ? 1. / ((1./raw_z)-parallel)
  52     : raw_z;
  53 }
  54 /*--------------------------------------------------------------------------*/
  55 /*--------------------------------------------------------------------------*/
  56 #endif
  57 // vim:ts=8:sw=2:noet: