SundanceFunctionalDerivative.hpp

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#ifndef SUNDANCE_FUNCTIONALDERIVATIVE_H
#define SUNDANCE_FUNCTIONALDERIVATIVE_H

#include "SundanceDefs.hpp"
#include "SundanceExpr.hpp"


namespace Sundance
{
using namespace Sundance;

using namespace Teuchos;

/** 
 * \relates Expr 
 *
 * Returns an expression that evaluates the functional derivative 
 * \f$ \frac{\partial F}{\partial u}.\f$ The functional derivatives
 * are evaluated internally using automatic differentiation. 
 *
 * Because functional derivatives required for linearization and optimization
 * are already done internally, it is unusual for explicit functional
 * derivatives to be needed at the user level. One case where they are needed
 * is in SUPG stabilization of conservation laws. 
 *
 * \param F any evaluatable expression, possibly list-valued
 *
 * \param u an unknown function or list of unknown functions
 */
Expr FunctionalDerivative(const Expr& F, const Expr& u);

}

#endif