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base/CosExpression.cpp

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00001 /****************************************************************************
00002   Copyright (C)2002 David Jung <opensim@pobox.com>
00003 
00004   This program/file is free software; you can redistribute it and/or modify
00005   it under the terms of the GNU General Public License as published by
00006   the Free Software Foundation; either version 2 of the License, or
00007   (at your option) any later version.
00008 
00009   This program is distributed in the hope that it will be useful,
00010   but WITHOUT ANY WARRANTY; without even the implied warranty of
00011   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012   GNU General Public License for more details. (http://www.gnu.org)
00013 
00014   You should have received a copy of the GNU General Public License
00015   along with this program; if not, write to the Free Software
00016   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00017 
00018   $Id: CosExpression.cpp 1029 2004-02-11 20:45:54Z jungd $
00019   $Revision: 1.3 $
00020   $Date: 2004-02-11 15:45:54 -0500 (Wed, 11 Feb 2004) $
00021   $Author: jungd $
00022 
00023 ****************************************************************************/
00024 
00025 #include <base/CosExpression>
00026 #include <base/NegateExpression>
00027 #include <base/ProductExpression>
00028 #include <base/SinExpression>
00029 
00030 using base::ExpressionNode;
00031 using base::NegateExpression;
00032 using base::ProductExpression;
00033 using base::SinExpression;
00034 using base::CosExpression;  
00035 
00036  void CosExpression::cacheDerivative(Int withRespectToIndex) const
00037 {
00038   derivative = ref<ExpressionNode>( NewObj NegateExpression(ref<ExpressionNode>( 
00039                                         NewObj ProductExpression( ref<ExpressionNode>(NewObj SinExpression(arg)),
00040                                                                   arg->differentiate(withRespectToIndex)) ) ) ); 
00041   derivWithRespToIndex = withRespectToIndex;
00042   derivCached = true;
00043 }

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