SundanceFunctionalDerivative.cpp

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//                             Sundance
//                 Copyright 2011 Sandia Corporation
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/* @HEADER@ */

#include "SundanceFunctionalDerivative.hpp"

#include "SundanceSymbolicTransformation.hpp"
#include "SundanceUnknownFuncElement.hpp"
#include "SundanceExplicitFunctionalDerivativeElement.hpp"

using namespace Sundance;
using namespace Teuchos;

using namespace Sundance;

Expr Sundance::FunctionalDerivative(const Expr& F, const Expr& u)
{
  if (F.size() == 1 && u.size()==1)
  {
    RCP<ScalarExpr> arg = SymbolicTransformation::getScalar(F[0]);

    const UnknownFuncElement* uPtr
      = dynamic_cast<const UnknownFuncElement*>(u[0].ptr().get());
    
    Deriv fd = funcDeriv(uPtr);
    
    return new ExplicitFunctionalDerivativeElement(arg, fd);
  }
  else if (F.size() > 1)
  {
    Array<Expr> rtnList(F.size());
    for (int i=0; i<rtnList.size(); i++)
    {
      rtnList[i] = FunctionalDerivative(F[i], u);
    }
    return new ListExpr(rtnList);
  }
  else 
  {
    Array<Expr> rtnList(u.size());
    for (int i=0; i<rtnList.size(); i++)
    {
      rtnList[i] = FunctionalDerivative(F, u[i]);
    }
    return new ListExpr(rtnList);
  }
  
}