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41 results

approximation.cweb

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  • ExprNode.cc 105.38 KiB
    /*
     * Copyright (C) 2007-2009 Dynare Team
     *
     * This file is part of Dynare.
     *
     * Dynare 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 of the License, or
     * (at your option) any later version.
     *
     * Dynare 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 Dynare.  If not, see <http://www.gnu.org/licenses/>.
     */
    
    #include <iostream>
    #include <iterator>
    #include <algorithm>
    
    // For select1st()
    #ifdef __GNUC__
    # include <ext/functional>
    using namespace __gnu_cxx;
    #endif
    
    #include <cassert>
    #include <cmath>
    
    #include "ExprNode.hh"
    #include "DataTree.hh"
    #include "ModFile.hh"
    
    ExprNode::ExprNode(DataTree &datatree_arg) : datatree(datatree_arg), preparedForDerivation(false)
    {
      // Add myself to datatree
      datatree.node_list.push_back(this);
    
      // Set my index and increment counter
      idx = datatree.node_counter++;
    }
    
    ExprNode::~ExprNode()
    {
    }
    
    NodeID
    ExprNode::getDerivative(int deriv_id)
    {
      if (!preparedForDerivation)
        prepareForDerivation();
    
      // Return zero if derivative is necessarily null (using symbolic a priori)
      set<int>::const_iterator it = non_null_derivatives.find(deriv_id);
      if (it == non_null_derivatives.end())
        return datatree.Zero;
    
      // If derivative is stored in cache, use the cached value, otherwise compute it (and cache it)
      map<int, NodeID>::const_iterator it2 = derivatives.find(deriv_id);
      if (it2 != derivatives.end())
        return it2->second;
      else
        {
          NodeID d = computeDerivative(deriv_id);
          derivatives[deriv_id] = d;
          return d;
        }