base/CosExpression.cpp

Go to the documentation of this file.

/****************************************************************************
  Copyright (C)2002 David Jung <opensim@pobox.com>

  This program/file 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 2 of the License, 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. (http://www.gnu.org)

  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  $Id: CosExpression.cpp 1029 2004-02-11 20:45:54Z jungd $
  $Revision: 1.3 $
  $Date: 2004-02-11 15:45:54 -0500 (Wed, 11 Feb 2004) $
  $Author: jungd $

****************************************************************************/

#include <base/CosExpression>
#include <base/NegateExpression>
#include <base/ProductExpression>
#include <base/SinExpression>

using base::ExpressionNode;
using base::NegateExpression;
using base::ProductExpression;
using base::SinExpression;
using base::CosExpression;  

 void CosExpression::cacheDerivative(Int withRespectToIndex) const
{
  derivative = ref<ExpressionNode>( NewObj NegateExpression(ref<ExpressionNode>( 
                                        NewObj ProductExpression( ref<ExpressionNode>(NewObj SinExpression(arg)),
                                                                  arg->differentiate(withRespectToIndex)) ) ) ); 
  derivWithRespToIndex = withRespectToIndex;
  derivCached = true;
}

---