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// ============================================================================
// ==                                                                        ==
// == AMDiS - Adaptive multidimensional simulations                          ==
// ==                                                                        ==
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// ==  http://www.amdis-fem.org                                              ==
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// ==                                                                        ==
// ============================================================================
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//
// Software License for AMDiS
//
// Copyright (c) 2010 Dresden University of Technology 
// All rights reserved.
// Authors: Simon Vey, Thomas Witkowski et al.
//
// This file is part of AMDiS
//
// See also license.opensource.txt in the distribution.


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/** \file Lagrange.h */

#ifndef AMDIS_LAGRANGE_H
#define AMDIS_LAGRANGE_H

#include "BasisFunction.h"
#include "FixVec.h"
#include "AbstractFunction.h"
#include <list>

namespace AMDiS {

#define MAX_DIM 3
#define MAX_DEGREE 4

  template<typename ReturnType, typename ArgumentType> class AbstractFunction;

  /** \ingroup FEMSpace
   * \brief
   * Lagrange basis functions. Sub class of BasisFunction
   */
  class Lagrange : public BasisFunction
  {
  protected:
    /** \brief
     * Constructs lagrange basis functions with the given dim and degree.
     * Constructor is protected to avoid multiple instantiation of identical
     * basis functions. Use \ref getLagrange instead.
     */
    Lagrange(int dim_, int degree_);

    /** \brief
     * destructor
     */
    virtual ~Lagrange();

  public:
    /** \brief
     * Returns a pointer to lagrange basis functions with the given dim and
     * degree. Multiple instantiation of identical basis functions is avoided
     * by rembering once created basis functions in \ref allBasFcts.
     */
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    static Lagrange* getLagrange(int dim, int degree);
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    /// Implements BasisFunction::interpol
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    const double *interpol(const ElInfo *, int, const int *, 
			   AbstractFunction<double, WorldVector<double> >*, 
			   double *);
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    /// Implements BasisFunction::interpol
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    const WorldVector<double> *interpol(const ElInfo *, int, 
					const int *b_no,
					AbstractFunction<WorldVector<double>, 
					WorldVector<double> >*, 
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					WorldVector<double> *);

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    /// Returns the barycentric coordinates of the i-th basis function.
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    DimVec<double> *getCoords(int i) const;

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    /// Implements BasisFunction::getDOFIndices
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    const DegreeOfFreedom* getDOFIndices(const Element*,
					 const DOFAdmin&, 
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					 DegreeOfFreedom*) const;

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    /// Implements BasisFunction::getBound
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    void getBound(const ElInfo*, BoundaryType *) const;
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    /** \brief
     * Calculates the local vertex indices which are involved in evaluating
     * the nodeIndex-th DOF at the positionIndex-th part of type position 
     * (VERTEX/EDGE/FACE/CENTER). nodeIndex determines the permutation
     * of the involved vertices. So in 1d for lagrange4 there are two DOFs at
     * the CENTER (which is an edge in this case). Then vertices[0] = {0, 1} and
     * vertices[1] = {1, 0}. This allows to use the same local basis function 
     * for all DOFs at the same position.
     */
    static void setVertices(int dim, int degree, 
			    GeoIndex position, int positionIndex, int nodeIndex, 
			    int** vertices);

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    /// Implements BasisFunction::refineInter
    inline void refineInter(DOFIndexed<double> *drv, RCNeighbourList* list, int n) 
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    {
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      if (refineInter_fct)
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	(*refineInter_fct)(drv, list, n, this);
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    }
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    /// Implements BasisFunction::coarseRestrict
    inline void coarseRestr(DOFIndexed<double> *drv, RCNeighbourList* list, int n)
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    {
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      if (coarseRestr_fct)
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	(*coarseRestr_fct)(drv, list, n, this);
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    }
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    /// Implements BasisFunction::coarseInter
    inline void coarseInter(DOFIndexed<double> *drv, RCNeighbourList* list, int n) 
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    {
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      if (coarseInter_fct)
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	(*coarseInter_fct)(drv, list, n, this);
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    }
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    /// Implements BasisFunction::getLocalIndices().
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    const DegreeOfFreedom *getLocalIndices(const Element *el,
					   const DOFAdmin *admin,
					   DegreeOfFreedom *dofs) const;
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    void getLocalDofPtrVec(const Element *el, 
			   const DOFAdmin *admin,
			   std::vector<const DegreeOfFreedom*>& vec) const;
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    /// Implements BasisFunction::l2ScpFctBas
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    void l2ScpFctBas(Quadrature* q,
		     AbstractFunction<double, WorldVector<double> >* f,
		     DOFVector<double>* fh);

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    /// Implements BasisFunction::l2ScpFctBas
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    void l2ScpFctBas(Quadrature* q,
		     AbstractFunction<WorldVector<double>, WorldVector<double> >* f,
		     DOFVector<WorldVector<double> >* fh);

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    static void clear();

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  protected:
    /** \brief
     * sets the barycentric coordinates (stored in \ref bary) of the local 
     * basis functions.
     */
    void setBary();

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    /// Recursive calculation of coordinates. Used by \ref setBary
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    void createCoords(int* coordInd, int numCoords, int dimIndex, int rest, 
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		      DimVec<double>* vec = NULL);
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    /// Used by \ref setBary
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    int** getIndexPermutations(int numIndices) const;

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    /// Implements BasisFunction::setNDOF
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    void setNDOF();

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    /// Sets used function pointers
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    void setFunctionPointer();

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    /// Used by \ref getDOFIndices and \ref getVec
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    int* orderOfPositionIndices(const Element* el, 
				GeoIndex position, 
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				int positionIndex) const;

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    /// Calculates the number of DOFs needed for Lagrange of the given dim and degree.
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    static int getNumberOfDofs(int dim, int degree);
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  private:
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    /// barycentric coordinates of the locations of all basis functions
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    std::vector<DimVec<double>* > *bary;
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    /** \name static dim-degree-arrays
     * \{
     */
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    static std::vector<DimVec<double>* > baryDimDegree[MAX_DIM + 1][MAX_DEGREE + 1];
    static DimVec<int>* ndofDimDegree[MAX_DIM + 1][MAX_DEGREE + 1];
    static int nBasFctsDimDegree[MAX_DIM + 1][MAX_DEGREE + 1];
    static std::vector<BasFctType*> phiDimDegree[MAX_DIM + 1][MAX_DEGREE + 1];
    static std::vector<GrdBasFctType*> grdPhiDimDegree[MAX_DIM + 1][MAX_DEGREE + 1];
    static std::vector<D2BasFctType*> D2PhiDimDegree[MAX_DIM + 1][MAX_DEGREE + 1];
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    /** \} */

    /** \brief
     * List of all used BasisFunctions in the whole program. Avoids duplicate
     * instantiation of identical BasisFunctions. 
     */
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    static std::list<Lagrange*> allBasFcts;
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  protected:
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    /// Pointer to the used refineInter function
    void (*refineInter_fct)(DOFIndexed<double> *, RCNeighbourList*, int, BasisFunction*);
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    /** \name refineInter functions
     * \{
     */  
    static void  refineInter0(DOFIndexed<double> *, RCNeighbourList*, int, 
			      BasisFunction*);
    static void  refineInter1(DOFIndexed<double> *, RCNeighbourList*, int, 
			      BasisFunction*);
    static void  refineInter2_1d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  refineInter2_2d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  refineInter2_3d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  refineInter3_1d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  refineInter3_2d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  refineInter3_3d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  refineInter4_1d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  refineInter4_2d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  refineInter4_3d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    /** \} */

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    /// Pointer to the used coarseRestr function
    void (*coarseRestr_fct)(DOFIndexed<double> *, RCNeighbourList*, int, BasisFunction*);
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    /** \name coarseRestr functions
     * \{
     */  
    static void  coarseRestr0(DOFIndexed<double> *, RCNeighbourList*, int, 
			      BasisFunction*);
    static void  coarseRestr1(DOFIndexed<double> *, RCNeighbourList*, int, 
			      BasisFunction*);
    static void  coarseRestr2_1d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseRestr2_2d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseRestr2_3d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseRestr3_1d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseRestr3_2d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseRestr3_3d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseRestr4_1d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseRestr4_2d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseRestr4_3d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    /** \} */

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    /// Pointer to the used coarseInter function
    void (*coarseInter_fct)(DOFIndexed<double> *, RCNeighbourList*, int, BasisFunction*);  
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    /** \name coarseInter functions
     * \{
     */
    static void  coarseInter0(DOFIndexed<double> *, RCNeighbourList*, int, 
			      BasisFunction*);
    static void  coarseInter1(DOFIndexed<double> *, RCNeighbourList*, int, 
			      BasisFunction*);
    static void  coarseInter2_1d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseInter2_2d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseInter2_3d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseInter3_1d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseInter3_2d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseInter3_3d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseInter4_1d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseInter4_2d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    static void  coarseInter4_3d(DOFIndexed<double> *, RCNeighbourList*, int, 
				 BasisFunction*);
    /** \} */

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    /// AbstractFunction which implements lagrange basis functions
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    class Phi : public BasFctType
    {
    public:
      /** \brief
       * Constructs the local lagrange basis function for the given position,
       * positionIndex and nodeIndex. owner_ is a pointer to the Lagrange object
       * this basis function belongs to.
       */
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      Phi(Lagrange* owner, GeoIndex position, int positionIndex, int nodeIndex);
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      /// Destructor
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      virtual ~Phi();

    private:
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      /// vertices needed for evaluation of this function
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      int* vertices;
    
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      /// Pointer to the evaluating function
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      double (*func)(const DimVec<double>& lambda, int* vert);
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      /// Returns \ref func(lambda, vertices)
      inline double operator()(const DimVec<double>& lambda) const 
      {
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	return func(lambda, vertices);
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      }
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      /** \name basis functions for different degrees
       * \{
       */

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      // ====== Lagrange, degree = 0 =====================================
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      // center
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      inline static double phi0c(const DimVec<double>&, int*) 
      {
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	return 1.0;
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      }
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      // ====== Lagrange, degree = 1 =====================================
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      // vertex
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      inline static double phi1v(const DimVec<double>& lambda, int* vertices) 
      {
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	return lambda[vertices[0]]; 
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      }
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      // ====== Lagrange, degree = 2 =====================================
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      // vertex
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      inline static double phi2v(const DimVec<double>& lambda, int* vertices) 
      {
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	return lambda[vertices[0]] * (2.0 * lambda[vertices[0]] - 1.0);
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      }    
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      // edge
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      inline static double phi2e(const DimVec<double>& lambda, int* vertices) 
      {
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	return (4.0 * lambda[vertices[0]] * lambda[vertices[1]]);
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      }
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      // ====== Lagrange, degree = 3 =====================================
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      // vertex
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      inline static double phi3v(const DimVec<double>& lambda, int* vertices) 
      {
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	return (4.5 * (lambda[vertices[0]] - 1.0) * lambda[vertices[0]] + 1.0) * 
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	  lambda[vertices[0]];
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      }
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      // edge
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      inline static double phi3e(const DimVec<double>& lambda, int* vertices) 
      {
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	return (13.5 * lambda[vertices[0]] - 4.5) * 
	  lambda[vertices[0]] * lambda[vertices[1]];
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      }
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      // face
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      inline static double phi3f(const DimVec<double>& lambda, int* vertices) 
      {
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	return 27.0 * lambda[vertices[0]] * lambda[vertices[1]] * 
	  lambda[vertices[2]];
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      }
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      // ====== Lagrange, degree = 4 ======================================
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      // vertex
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      inline static double phi4v(const DimVec<double>& lambda, int* vertices) 
      {
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	return (((32.0 * lambda[vertices[0]] - 48.0) * lambda[vertices[0]] + 22.0)
	       * lambda[vertices[0]] - 3.0) * lambda[vertices[0]] / 3.0;
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      }
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      // edge
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      inline static double phi4e0(const DimVec<double>& lambda, int* vertices) 
      {
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	return ((128.0 * lambda[vertices[0]] - 96.0) * lambda[vertices[0]] + 16.0)
	  * lambda[vertices[0]] * lambda[vertices[1]] / 3.0;
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      }
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      inline static double phi4e1(const DimVec<double>& lambda, int* vertices) 
      {
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	return (4.0 * lambda[vertices[0]] - 1.0) * lambda[vertices[0]] * 
	  (4.0 * lambda[vertices[1]] - 1.0) * lambda[vertices[1]] * 4.0;
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      }
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      // face
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      inline static double phi4f(const DimVec<double>& lambda,  int* vertices) 
      {
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	return (4.0 * lambda[vertices[0]] - 1.0) * lambda[vertices[0]] * 
	  lambda[vertices[1]] * lambda[vertices[2]] * 32.0;
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      }
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      // center
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      inline static double phi4c(const DimVec<double>& lambda, int* vertices) 
      {
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	return 256.0 * lambda[vertices[0]] * lambda[vertices[1]] * 
	  lambda[vertices[2]] * lambda[vertices[3]];
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      }
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    };
  
    /** \} */

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    /** \brief
     * AbstractFunction which implements gradients of lagrange basis functions.
     * See \ref Phi
     */
    class GrdPhi : public GrdBasFctType
    {
    public:
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      GrdPhi(Lagrange* owner, GeoIndex position, int positionIndex, int nodeIndex);

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      virtual ~GrdPhi();
    private:
      int* vertices;
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      void (*func)(const DimVec<double>& lambda, int* vertices_, 
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		   DimVec<double>& result);
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      inline void operator()(const DimVec<double>& lambda, DimVec<double>& result) const 
      {
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	func(lambda, vertices, result);
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      }
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      // ====== Lagrange0 ================================================
      // center
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      inline static void grdPhi0c(const DimVec<double>&, 
				  int*, 
				  DimVec<double>& result) 
      {
	result.set(0.0);
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      }
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      // ====== Lagrange1 ================================================
      // vertex
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      inline static void grdPhi1v(const DimVec<double>&, 
				  int* vertices, 
				  DimVec<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]] = 1.0;
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      }
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      // ====== Lagrange2 ================================================
      // vertex
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      inline static void grdPhi2v(const DimVec<double>& lambda, 
				  int* vertices, 
				  DimVec<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]] = 4.0 * lambda[vertices[0]] - 1.0;
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      }
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      // edge
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      inline static void grdPhi2e(const DimVec<double>& lambda, 
				  int* vertices, 
				  DimVec<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]] = 4.0 * lambda[vertices[1]];
	result[vertices[1]] = 4.0 * lambda[vertices[0]];
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      }
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      // ===== Lagrange3 ================================================
      // vertex
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      inline static void grdPhi3v(const DimVec<double>& lambda,
				  int* vertices,
				  DimVec<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]] = (13.5 * lambda[vertices[0]] - 9.0) * 
	  lambda[vertices[0]] + 1.0;
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      }
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      // edge
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      inline static void grdPhi3e(const DimVec<double>& lambda,
				  int* vertices, 
				  DimVec<double>& result)
      {
	result.set(0.0);
	result[vertices[0]] = (27.0 * lambda[vertices[0]] - 4.5) * 
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	  lambda[vertices[1]];
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	result[vertices[1]] = (13.5 * lambda[vertices[0]] - 4.5) * 
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	  lambda[vertices[0]];
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      }
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      // face
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      inline static void grdPhi3f(const DimVec<double>& lambda, 
				  int* vertices, 
				  DimVec<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]] = 27.0 * lambda[vertices[1]] * lambda[vertices[2]];
	result[vertices[1]] = 27.0 * lambda[vertices[0]] * lambda[vertices[2]];
	result[vertices[2]] = 27.0 * lambda[vertices[0]] * lambda[vertices[1]];
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      }
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      // ===== Lagrange4 ================================================
      // vertex
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      inline static void grdPhi4v(const DimVec<double>& lambda, 
				  int* vertices, 
				  DimVec<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]] = 
	  ((128.0 * lambda[vertices[0]] - 144.0) * lambda[vertices[0]] + 44.0) * 
	  lambda[vertices[0]] / 3.0 - 1.0;
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      }
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      // edge
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      inline static void grdPhi4e0(const DimVec<double>& lambda,
				   int* vertices, 
				   DimVec<double>& result)
      {
	result.set(0.0);
	result[vertices[0]] = ((128.0 * lambda[vertices[0]] - 64.0) * 
			       lambda[vertices[0]] + 16.0 / 3.0) * lambda[vertices[1]];
	result[vertices[1]] = ((128.0 * lambda[vertices[0]] - 96.0) * 
			       lambda[vertices[0]] + 16.0)*lambda[vertices[0]] / 3.0;
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      }
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      inline static void grdPhi4e1(const DimVec<double>& lambda,
				   int* vertices,
				   DimVec<double>& result)
      {
	result.set(0.0);
	result[vertices[0]] = 4.0 * (8.0 * lambda[vertices[0]] - 1.0) * 
	  lambda[vertices[1]] * (4.0 * lambda[vertices[1]] - 1.0);
	result[vertices[1]] = 4.0 * lambda[vertices[0]] * 
	  (4.0 * lambda[vertices[0]] - 1.0) * (8.0 * lambda[vertices[1]] - 1.0);
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      }
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      // face
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      inline static void grdPhi4f(const DimVec<double>& lambda, 
				  int* vertices, 
				  DimVec<double>& result)
      {
	result.set(0.0);
	result[vertices[0]] = 32.0 * (8.0 * lambda[vertices[0]] - 1.0) * 
	  lambda[vertices[1]] * lambda[vertices[2]];
	result[vertices[1]] = 32.0 * (4.0 * lambda[vertices[0]] - 1.0) * 
	  lambda[vertices[0]] * lambda[vertices[2]];
	result[vertices[2]] = 32.0 * (4.0 * lambda[vertices[0]] - 1.0) * 
	  lambda[vertices[0]] * lambda[vertices[1]];	
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      }
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      // center
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      inline static void grdPhi4c(const DimVec<double>& lambda, 
				  int* vertices,
				  DimVec<double>& result) 
      {
	result.set(0.0);
	result[0] = 256.0 * lambda[vertices[1]] * lambda[vertices[2]] * lambda[vertices[3]];
	result[1] = 256.0 * lambda[vertices[0]] * lambda[vertices[2]] * lambda[vertices[3]];
	result[2] = 256.0 * lambda[vertices[0]] * lambda[vertices[1]] * lambda[vertices[3]];
	result[3] = 256.0 * lambda[vertices[0]] * lambda[vertices[1]] * lambda[vertices[2]];
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      }
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    };

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    /** \brief
     * AbstractFunction which implements second derivatives of Lagrange basis
     * functions. See \ref Phi
     */
    class D2Phi : public D2BasFctType
    {
    public:
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      D2Phi(Lagrange* owner, GeoIndex position, int positionIndex, int nodeIndex);
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      virtual ~D2Phi();
    private:
      int* vertices;
    
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      void (*func)(const DimVec<double>& lambda, int* vertices_, DimMat<double>& result);
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      inline void operator()(const DimVec<double>& lambda, DimMat<double>& result) const {
	return func(lambda, vertices, result);
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      }
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      // ===== Lagrange0 ================================================
      // center
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      inline static void D2Phi0c(const DimVec<double>&, int*, DimMat<double>& result) 
      {
	result.set(0.0);       
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      }
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      // ===== Lagrange1 ================================================
      // vertex
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      inline static void D2Phi1v(const DimVec<double>&, int*, DimMat<double>& result) 
      {
	result.set(0.0);
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      }
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      // ===== Lagrange2 ================================================
      // vertex
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      inline static void D2Phi2v(const DimVec<double>&, int* vertices, 
				 DimMat<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]][vertices[0]] = 4.0;
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      }
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      // edge
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      inline static void D2Phi2e(const DimVec<double>&, int* vertices, 
				 DimMat<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]][vertices[1]] = 4.0;
	result[vertices[1]][vertices[0]] = 4.0;
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      }
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      // ===== Lagrange3 ================================================
      // vertex
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      inline static void D2Phi3v(const DimVec<double>& lambda, int* vertices, 
				 DimMat<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]][vertices[0]] = 27.0 * lambda[vertices[0]] - 9.0;
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      }
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      // edge
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      inline static void D2Phi3e(const DimVec<double>& lambda, int* vertices, 
				 DimMat<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]][vertices[0]] = 27.0 * lambda[vertices[1]];
	result[vertices[0]][vertices[1]] = 
	  result[vertices[1]][vertices[0]] = 27.0 * lambda[vertices[0]] - 4.5;
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      }
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      // face
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      inline static void D2Phi3f(const DimVec<double>& lambda, int* vertices, 
				 DimMat<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]][vertices[1]] = 
	  result[vertices[1]][vertices[0]] = 27.0 * lambda[vertices[2]];
	result[vertices[0]][vertices[2]] = 
	  result[vertices[2]][vertices[0]] = 27.0 * lambda[vertices[1]];
	result[vertices[1]][vertices[2]] = 
	  result[vertices[2]][vertices[1]] = 27.0 * lambda[vertices[0]];
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      }
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      // ===== Lagrange4 ================================================
      // vertex
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      inline static void D2Phi4v(const DimVec<double>& lambda, 
				 int* vertices, 
				 DimMat<double>& result) {
	result.set(0.0);
	result[vertices[0]][vertices[0]] = 
	  (128.0 * lambda[vertices[0]] - 96.0) * lambda[vertices[0]] + 44.0 / 3.0;
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      }
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      // edge
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      inline static void D2Phi4e0(const DimVec<double>& lambda, int* vertices, 
				  DimMat<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]][vertices[0]] = 
	  (256.0 * lambda[vertices[0]] - 64.0) * lambda[vertices[1]];
	result[vertices[0]][vertices[1]] = 
	  result[vertices[1]][vertices[0]] =
	  (128.0 * lambda[vertices[0]] - 64.0) * lambda[vertices[0]] + 16.0 / 3.0;
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      }
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      inline static void D2Phi4e1(const DimVec<double>& lambda, int* vertices, 
				  DimMat<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]][vertices[0]] = 
	  32.0 * lambda[vertices[1]] * (4.0 * lambda[vertices[1]] - 1.0);
	result[vertices[0]][vertices[1]] = 
	  result[vertices[1]][vertices[0]] = 
	  4.0 * (8.0 * lambda[vertices[0]] - 1.0) * (8.0 * lambda[vertices[1]] - 1.0);
	result[vertices[1]][vertices[1]] = 
	  32.0 * lambda[vertices[0]] * (4.0 * lambda[vertices[0]] - 1.0);
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      }
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      // face
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      inline static void D2Phi4f(const DimVec<double>& lambda, int* vertices, 
				 DimMat<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]][vertices[0]] = 
	  256.0 * lambda[vertices[1]] * lambda[vertices[2]];
	result[vertices[0]][vertices[1]] = 
	  result[vertices[1]][vertices[0]] = 
	  32.0 * (8.0 * lambda[vertices[0]] - 1.0) * lambda[vertices[2]];
	result[vertices[0]][vertices[2]] = 
	  result[vertices[2]][vertices[0]] = 
	  32.0 * (8.0 * lambda[vertices[0]] - 1.0) * lambda[vertices[1]];
	result[vertices[1]][vertices[2]] = 
	  result[vertices[2]][vertices[1]] = 
	  32.0 * (4.0 * lambda[vertices[0]] - 1.0) * lambda[vertices[0]];
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      }
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      // center
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      inline static void D2Phi4c(const DimVec<double>& lambda, int* vertices, 
				 DimMat<double>& result) 
      {
	result.set(0.0);
	result[vertices[0]][vertices[1]] = 
	  result[vertices[1]][vertices[0]] = 
	  256.0 * lambda[vertices[2]] * lambda[vertices[3]];
	result[vertices[0]][vertices[2]] = 
	  result[vertices[2]][vertices[0]] = 
	  256.0 * lambda[vertices[1]] * lambda[vertices[3]];
	result[vertices[0]][vertices[3]] = 
	  result[vertices[3]][vertices[0]] = 
	  256.0 * lambda[vertices[1]] * lambda[vertices[2]];
	result[vertices[1]][vertices[2]] = 
	  result[vertices[2]][vertices[1]] = 
	  256.0 * lambda[vertices[0]] * lambda[vertices[3]];
	result[vertices[1]][vertices[3]] = 
	  result[vertices[3]][vertices[1]] = 
	  256.0 * lambda[vertices[0]] * lambda[vertices[2]];
	result[vertices[2]][vertices[3]] = 
	  result[vertices[3]][vertices[2]] = 
	  256.0 * lambda[vertices[0]] * lambda[vertices[1]];
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      }
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    };
  };

}

#endif // AMDIS_LAGRANGE_H