// Definitions for class dctfield
//
// dctfield.cpp
//
// Jesper Andersson, FMRIB Image Analysis Group
//
// Copyright (C) 2007 University of Oxford 
//
/*  Part of FSL - FMRIB's Software Library
    http://www.fmrib.ox.ac.uk/fsl
    fsl@fmrib.ox.ac.uk
    
    Developed at FMRIB (Oxford Centre for Functional Magnetic Resonance
    Imaging of the Brain), Department of Clinical Neurology, Oxford
    University, Oxford, UK
    
    
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//

#include <string>
#include <iostream>
#include <iomanip>
#include <fstream>
#include <vector>
#include <boost/shared_ptr.hpp>
#include "newmat.h"
#include "miscmaths/bfmatrix.h"
#include "dctfield.h"

#ifndef SQR
#define SQR(A) ((A)*(A))
#endif

using namespace std;
using namespace NEWMAT;

namespace BASISFIELD {

// Constructor, assignement and destructor

dctfield::dctfield(const std::vector<unsigned int>& psz, const std::vector<double>& pvxs, const std::vector<unsigned int>& porder)
  : basisfield(psz,pvxs), dctbas(3)
{
  if (porder.size() != NDim()) {throw BasisfieldException("dctfield::dctfield: Dimensionality mismatch");}
  if (porder[0]<1 || porder[0]>FieldSz_x() || (NDim()>1 && (porder[1]<0 || porder[1]>FieldSz_y())) || (NDim()>2 && (porder[2]<0 || porder[2]>FieldSz_z()))) {
    throw BasisfieldException("dctfield::dctfield: Invalid order of DCT transform");
  }

  unsigned int lsz[] = {FieldSz_x(), FieldSz_y(), FieldSz_z()};
  for (unsigned int i=0; i<3; i++) {
    dctbas[i] = std::vector<boost::shared_ptr<NEWMAT::Matrix> >(3);
    int lorder = (i<NDim()) ? porder[i] : 1;
    for (int d=0; d<3; d++) {
      dctbas[i][d] = make_dctbas(lsz[i],lorder,d);
    }
  }

  boost::shared_ptr<NEWMAT::ColumnVector>  lcoef(new NEWMAT::ColumnVector(CoefSz()));
  *lcoef = 0.0;
  set_coef_ptr(lcoef);  
}

dctfield::dctfield(const dctfield& inf) 
: basisfield(inf), dctbas(3)
{
  basisfield::assign(inf);
  dctfield::assign(inf);
}

void dctfield::assign(const dctfield& inf)
{
  for (int i=0; i<3; i++) {
    dctbas[i] = std::vector<boost::shared_ptr<NEWMAT::Matrix> >(3);
    for (int j=0; j<3; j++) {
      dctbas[i][j] = boost::shared_ptr<NEWMAT::Matrix>(new NEWMAT::Matrix(*(inf.dctbas[i][j])));
    }
  }
}

dctfield& dctfield::operator=(const dctfield& inf)
{
  if (&inf == this) {return(*this);} // Detect self

  dctbas = std::vector<std::vector<boost::shared_ptr<NEWMAT::Matrix> > >(3);
  basisfield::assign(inf);   // Assign common part
  dctfield::assign(inf);     // Assign dctfield specific bits

  return(*this);
}

// General utility functions

// Functions that actually do some work

void dctfield::SetToConstant(double fv)
{
  double cfac = dctbas[0][0]->element(0,0) * dctbas[1][0]->element(0,0) * dctbas[2][0]->element(0,0);
  double coefval = fv / cfac;
  NEWMAT::ColumnVector  lcoef(CoefSz());
  lcoef = 0.0;
  lcoef(1) = coefval;
  SetCoef(lcoef);
}

std::vector<double> dctfield::SubsampledVoxelSize(const std::vector<unsigned int>&  subsampling,
					          std::vector<double>               ovxs,
					          std::vector<unsigned int>         isize) const
{
  std::vector<unsigned int>     osize(3), nsize(3);
  if (isize.size()) nsize = SubsampledMatrixSize(subsampling,osize=isize);
  else { 
    osize[0] = FieldSz_x(); osize[1] = FieldSz_y(); osize[2] = FieldSz_z();
    nsize = SubsampledMatrixSize(subsampling,osize);
  }
    
  std::vector<double>  nvxs(ovxs);
  if (!nvxs.size()) {nvxs.resize(3); nvxs[0]=Vxs_x(); nvxs[1]=Vxs_y(); nvxs[2]=Vxs_z();}
  for (int i=0; i<int(nvxs.size()); i++) {
    nvxs[i] = nvxs[i]*double(osize[i]+1)/double(nsize[i]+1);
  }
  return(nvxs); 
}

std::vector<unsigned int> dctfield::SubsampledMatrixSize(const std::vector<unsigned int>&   subsampling,
                                                         std::vector<unsigned int>          isize) const
{
  std::vector<unsigned int>  osize(3,0);
  if (isize.size()) osize = isize;
  else {osize[0] = FieldSz_x(); osize[1] = FieldSz_y(); osize[2] = FieldSz_z();}
  for (unsigned int i=0; i<osize.size(); i++) {
    while (osize[i]%subsampling[i]) osize[i] += 1;
    osize[i] /= subsampling[i];
  }
  return(osize);
}

void dctfield::Update(FieldIndex fi)
{
  if (fi>int(NDim())) {throw BasisfieldException("dctfield::Update: Cannot take derivative in singleton direction");}

  if (UpToDate(fi)) {return;} // Field already fine.

  const boost::shared_ptr<NEWMAT::ColumnVector> lcoef = GetCoef();
  if (!lcoef) {throw BasisfieldException("dctfield::Update: No coefficients set yet");}

  boost::shared_ptr<NEWMAT::ColumnVector> fptr = get_ptr(fi);
  int tmp[] = {0,0,0};
  if (fi) {tmp[fi-1] = 1;}
  AkBkCxb(*(dctbas[0][tmp[0]]),*(dctbas[1][tmp[1]]),*(dctbas[2][tmp[2]]),*lcoef,*fptr);
  set_update_flag(true,fi);
}

//
// All the Jte and JtJ routines are presently just stubs. However, all the 
// functionality has been properly implemented. Have a look at the 
// deprecated ColumnVector versions of these routines in dead_code.cpp
// to see how to get these routines functional again.
//

NEWMAT::ReturnMatrix dctfield::Jte(const NEWIMAGE::volume<float>&  ima1,
                                   const NEWIMAGE::volume<float>&  ima2,
                                   const NEWIMAGE::volume<char>    *mask) const
{
  NEWMAT::ColumnVector tmp(1);
  tmp.Release();
  return(tmp);
}

NEWMAT::ReturnMatrix dctfield::Jte(const std::vector<unsigned int>&  deriv,
                                   const NEWIMAGE::volume<float>&    ima1,
                                   const NEWIMAGE::volume<float>&    ima2,
                                   const NEWIMAGE::volume<char>      *mask) const
{
  NEWMAT::ColumnVector tmp(1);
  tmp.Release();
  return(tmp);
}

NEWMAT::ReturnMatrix dctfield::Jte(const NEWIMAGE::volume<float>&    ima,
                                   const NEWIMAGE::volume<char>      *mask) const
{
  NEWMAT::ColumnVector tmp(1);
  tmp.Release();
  return(tmp);
}


NEWMAT::ReturnMatrix dctfield::Jte(const std::vector<unsigned int>&  deriv,
                                   const NEWIMAGE::volume<float>&    ima,
                                   const NEWIMAGE::volume<char>      *mask) const
{
  NEWMAT::ColumnVector tmp(1);
  tmp.Release();
  return(tmp);
}

boost::shared_ptr<MISCMATHS::BFMatrix> dctfield::JtJ(const NEWIMAGE::volume<float>&    ima,
                                                     const NEWIMAGE::volume<char>      *mask,
                                                     MISCMATHS::BFMatrixPrecisionType  prec) const
{
  boost::shared_ptr<BFMatrix> H = boost::shared_ptr<BFMatrix>(new FullBFMatrix);
  return(H);
}

boost::shared_ptr<MISCMATHS::BFMatrix> dctfield::JtJ(const NEWIMAGE::volume<float>&       ima1,
                                                     const NEWIMAGE::volume<float>&       ima2,
                                                     const NEWIMAGE::volume<char>         *mask,
                                                     MISCMATHS::BFMatrixPrecisionType     prec) const
{
  boost::shared_ptr<BFMatrix> H = boost::shared_ptr<BFMatrix>(new FullBFMatrix);
  return(H);
}

boost::shared_ptr<MISCMATHS::BFMatrix> dctfield::JtJ(const std::vector<unsigned int>&       deriv, 
                                                     const NEWIMAGE::volume<float>&         ima,
                                                     const NEWIMAGE::volume<char>           *mask,
                                                     MISCMATHS::BFMatrixPrecisionType       prec) const
{
  boost::shared_ptr<BFMatrix> H = boost::shared_ptr<BFMatrix>(new FullBFMatrix);
  return(H);
}

boost::shared_ptr<MISCMATHS::BFMatrix> dctfield::JtJ(const std::vector<unsigned int>&       deriv, 
                                                     const NEWIMAGE::volume<float>&         ima1,
                                                     const NEWIMAGE::volume<float>&         ima2,
                                                     const NEWIMAGE::volume<char>           *mask,
                                                     MISCMATHS::BFMatrixPrecisionType       prec) const
{
  boost::shared_ptr<BFMatrix> H = boost::shared_ptr<BFMatrix>(new FullBFMatrix);
  return(H);
}

boost::shared_ptr<MISCMATHS::BFMatrix> dctfield::JtJ(const std::vector<unsigned int>&         deriv1,
                                                     const NEWIMAGE::volume<float>&           ima1,
                                                     const std::vector<unsigned int>&         deriv2,
                                                     const NEWIMAGE::volume<float>&           ima2,
                                                     const NEWIMAGE::volume<char>             *mask,
                                                     MISCMATHS::BFMatrixPrecisionType         prec) const
{
  boost::shared_ptr<BFMatrix> H = boost::shared_ptr<BFMatrix>(new FullBFMatrix);
  return(H);
}

boost::shared_ptr<MISCMATHS::BFMatrix> dctfield::JtJ(const NEWIMAGE::volume<float>&        ima1,
                                                     const basisfield&                     bf2,
                                                     const NEWIMAGE::volume<float>&        ima2,
                                                     const NEWIMAGE::volume<char>          *mask,
                                                     MISCMATHS::BFMatrixPrecisionType      prec) const
{
  boost::shared_ptr<BFMatrix> H = boost::shared_ptr<BFMatrix>(new FullBFMatrix);
  return(H);
}


double dctfield::MemEnergy() const // Membrane energy of the field
{
  const boost::shared_ptr<NEWMAT::ColumnVector> lcoef = GetCoef();
  if (!lcoef) {throw BasisfieldException("dctfield::MemEnergy: No coefficients set yet");}

  NEWMAT::DiagonalMatrix H(CoefSz());
  memen_H(H);
  return(static_cast<double>(DotProduct(*(lcoef),H*(*lcoef))));
}

NEWMAT::ReturnMatrix dctfield::MemEnergyGrad() const // Gradient of the membrane energy
{
  const boost::shared_ptr<NEWMAT::ColumnVector> lcoef = GetCoef();
  if (!lcoef) {throw BasisfieldException("dctfield::MemEnergy: No coefficients set yet");}

  ColumnVector  grad(CoefSz());
  NEWMAT::DiagonalMatrix H(CoefSz());
  memen_H(H);
  grad = H*(*lcoef);
  grad.Release();
  return(grad);
}
 
boost::shared_ptr<BFMatrix> dctfield::MemEnergyHess(MISCMATHS::BFMatrixPrecisionType prec) const // Hessian of membrane energy
{
  if (prec!=BFMatrixDoublePrecision) throw BasisfieldException("dctfield::MemEnergyHess: Hessian must be double precision"); 

  boost::shared_ptr<FullBFMatrix>     H(new FullBFMatrix);
  NEWMAT::DiagonalMatrix              tmp(CoefSz());
  memen_H(tmp);
  boost::shared_ptr<NEWMAT::Matrix>   mp(new Matrix(tmp));   // Wasteful, but can't make it work any other way. 
  H->SetMatrixPtr(mp);

  return(H);
}

boost::shared_ptr<BASISFIELD::basisfield> dctfield::ZoomField(const std::vector<unsigned int>&    psz,
                                                              const std::vector<double>&          pvxs,
                                                              std::vector<unsigned int>           porder) const
{
  // Make sure requested matrix-size is valid
  for (int i=0; i<3; i++) {
    if (!valid_size(psz[i],pvxs[i],porder[i],i)) throw BasisfieldException("dctfield::ZoomField: Invalid zoom requsted");
  }  
 
  boost::shared_ptr<BASISFIELD::dctfield> tptr(new BASISFIELD::dctfield(psz,pvxs,porder));

  const boost::shared_ptr<NEWMAT::ColumnVector> ocptr = GetCoef();
  boost::shared_ptr<NEWMAT::ColumnVector> ncptr = tptr->get_coef();

  // Repack old coefficients into relevant part of new coefficient vector

  int oorder[3] = {CoefSz_x(), CoefSz_y(), CoefSz_z()};
  *ncptr = 0.0;
  for (int z=0; z<oorder[2]; z++) {
    for (int y=0; y<oorder[1]; y++) {
      for (int x=0; x<oorder[0]; x++) {
        ncptr->element(z*porder[0]*porder[1]+y*porder[0]+x) = ocptr->element(z*oorder[0]*oorder[1]+y*oorder[0]+x);
      }
    }
  }

  return(tptr);
}

// Functions that are declared private

boost::shared_ptr<NEWMAT::Matrix> dctfield::make_dctbas(unsigned int size, unsigned int order, unsigned int deriv) const
{
  boost::shared_ptr<NEWMAT::Matrix>  tmptr(new NEWMAT::Matrix(size,order));
  for (unsigned int i=0; i<size; i++) {
    tmptr->element(i,0) = (deriv) ? 0 : 1.0/sqrt(double(size));
  }
  for (unsigned int i=0; i<size; i++) {
    for (unsigned int j=1; j<order; j++) {
      switch (deriv) {
      case 0:
        tmptr->element(i,j) = sqrt(2.0/size) * cos((PI*(2.0*i+1.0)*j)/(2.0*size));
	break;
      case 1:
	tmptr->element(i,j) = -sqrt(2.0/size) * sin((PI*(2.0*i+1.0)*j)/(2.0*size)) * PI*j/double(size);
        break;
      case 2:
	tmptr->element(i,j) = -sqrt(2.0/size) * cos((PI*(2.0*i+1.0)*j)/(2.0*size)) * SQR((PI*j)/double(size));
	break;
      }
    }
  }
  return(tmptr);
}

bool dctfield::valid_size(unsigned int psz, double pvxs, unsigned int porder, unsigned int pdim) const
{
  // Make sure we are upsampling or leaving the same
  unsigned int osz[3] = {FieldSz_x(), FieldSz_y(), FieldSz_z()};
  if (psz < osz[pdim]) return(false);
  // Make sure we have same or higher order
  unsigned int oorder[3] = {CoefSz_x(), CoefSz_y(), CoefSz_z()};
  if (porder < oorder[pdim]) return(false);
  // Make sure upsampling step is valid
  std::vector<unsigned int>   nsz(1,0);
  bool valid = false;
  unsigned int ss = 1;
  for (; ss<64; ss*=2) {
    nsz[0] = psz;
    nsz = SubsampledMatrixSize(ss,nsz);
    if (nsz[0] == osz[pdim]) {
      valid = true;
      break;
    }
  }
  // Make sure voxel-size matches
  if (valid) {
    double eps = 1e-6;
    double ovxs[] = {Vxs_x(), Vxs_y(), Vxs_z()};
    std::vector<double> nvxs(1,pvxs);
    nsz[0] = psz;
    nvxs = SubsampledVoxelSize(ss,nvxs,nsz);
    valid = (fabs(nvxs[0]-ovxs[pdim]) < eps); 
  }
  return(valid);
}

//
// Calculates (AkBkC)*b where A, B and C are matrices, k denotes
// Kronecker tensor product and b is a colum vector with 
// A.Ncols()*B.Ncols()*C.Ncols() rows.
//
// Useful for calulating the field, and also for calculating the
// gradient.
// 
void dctfield::AkBkCxb(const NEWMAT::Matrix&                   A, 
                       const NEWMAT::Matrix&                   B, 
                       const NEWMAT::Matrix&                   C, 
                       const NEWMAT::ColumnVector&             b, 
                       NEWMAT::ColumnVector&                   ret) const
{
  ret = 0.0;
  for (int mk=0; mk<C.Ncols(); mk++) {
    NEWMAT::Matrix tmpM(A.Nrows(),B.Ncols());
    for (int mj=0; mj<B.Ncols(); mj++) {
      tmpM.Column(mj+1) = A * b.Rows(mk*A.Ncols()*B.Ncols()+mj*A.Ncols()+1,mk*A.Ncols()*B.Ncols()+(mj+1)*A.Ncols());
    }
    NEWMAT::ColumnVector tmpV(A.Nrows()*B.Nrows());
    for (int nj=0; nj<B.Nrows(); nj++) {
      tmpV.Rows(nj*A.Nrows()+1,(nj+1)*A.Nrows()) = tmpM*(B.Row(nj+1)).t();
    }
    for (int nk=0; nk<C.Nrows(); nk++) {
      ret.Rows(nk*A.Nrows()*B.Nrows()+1,(nk+1)*A.Nrows()*B.Nrows()) += C.element(nk,mk) * tmpV;
    }
  }    
}

//
// The following routines could be written much more clearly if I 
// used the capabilities of the NEWMAT classes. But it would also
// mean that a LOT of constructors would be invoked, and a lot of
// bounds would be checked. So I have chosen to (partly) revert to 
// good ole C programming.
//

void dctfield::AtA(const NEWMAT::Matrix&        Bx,
                   const NEWMAT::Matrix&        By,
                   const NEWMAT::Matrix&        Bz,
                   const NEWMAT::ColumnVector&  ima,
                   NEWMAT::Matrix&              AtA) const
{
  double  *istore = ima.Store();
  double  *AtAp = AtA.Store();
  int     znc = Bz.Ncols();
  int     xysz = Bx.Ncols()*By.Ncols();
  int     AtAsz = Bx.Ncols()*By.Ncols()*Bz.Ncols();
  double  *AtA1p = new double[SQR(Bx.Ncols()*By.Ncols())];

  AtA = 0.0;
  for (int z=0; z<Bz.Nrows(); z++) {
    // Get contribution for this slice
    double *iptr = &(istore[z*Bx.Nrows()*By.Nrows()]);
    one_slice_AtA(Bx,By,iptr,AtA1p);
    // Tile scaled versions of AtA1p
    for (int zr=0; zr<znc; zr++) {
      for (int zc=zr; zc<znc; zc++) {
        double scl = Bz.element(z,zr)*Bz.element(z,zc);
        for (int xyr=0; xyr<xysz; xyr++) {
          for (int xyc=xyr; xyc<xysz; xyc++) {
	    AtAp[(zr*xysz+xyr)*AtAsz + zc*xysz+xyc] += scl*AtA1p[xyr*xysz+xyc];
	  }
	}
      }
    }
  }
  //
  // We have now filled in the upper diagonal part of the
  // upper diagonal set of tiles. Now we need to do the rest.
  //
  // Fill in lower diagonals of upper diagonal tiles
  //
  for (int zr=0; zr<znc; zr++) {
    for (int zc=zr; zc<znc; zc++) {
      for (int xyr=0; xyr<xysz; xyr++) {
	for (int xyc=0; xyc<xyr; xyc++) {
	  AtAp[(zr*xysz+xyr)*AtAsz + zc*xysz+xyc] = AtAp[(zr*xysz+xyc)*AtAsz + zc*xysz+xyr];
	}
      }
    }
  }
  // Fill in lower diagonal tiles
  for (int zr=0; zr<znc; zr++) {
    for (int zc=0; zc<zr; zc++) {
      for (int xyr=0; xyr<xysz; xyr++) {
	for (int xyc=0; xyc<xysz; xyc++) {
	  AtAp[(zr*xysz+xyr)*AtAsz + zc*xysz+xyc] = AtAp[(zc*xysz+xyr)*AtAsz + zr*xysz+xyc];
	}
      }
    }
  }  
  
  delete[] AtA1p;
}

void dctfield::one_slice_AtA(const NEWMAT::Matrix&   Bx,
                             const NEWMAT::Matrix&   By,
                             const double            *ima,
                             double                  *AtA) const
{
  NEWMAT::Matrix           XtX(Bx.Ncols(),Bx.Ncols());
  NEWMAT::Matrix           Bxt = Bx.t();
  NEWMAT::DiagonalMatrix   pima(Bx.Nrows());
  int                      xnc = Bx.Ncols();
  int                      ync = By.Ncols();
  int                      AtAsz = xnc*ync;

  memset(AtA,0,SQR(AtAsz)*sizeof(double));
  for (int my=0; my<By.Nrows(); my++) {
    const double *iptr = &(ima[my*Bx.Nrows()]);
    pima << iptr;
    XtX = Bxt*pima*Bx;     // This line can be made more efficient
    double *XtXp = XtX.Store();
    // Now we tile scaled versions of XtX
    for (int yr=0; yr<ync; yr++) {
      for (int yc=yr; yc<ync; yc++) {
        double scl = By.element(my,yr)*By.element(my,yc);
	for (int xr=0; xr<xnc; xr++) {
	  for (int xc=xr; xc<xnc; xc++) {
            AtA[(yr*xnc+xr)*AtAsz + yc*xnc+xc] += scl*XtXp[xr*xnc+xc];
	  }
	}
      }
    }
  }
  //
  // We have now filled in the upper diagonal part of the
  // upper diagonal set of tiles. Now we need to do the rest.
  //
  // Fill in lower diagonals of upper diagonal tiles
  //
  for (int yr=0; yr<ync; yr++) {
    for (int yc=yr; yc<ync; yc++) {
      for (int xr=0; xr<xnc; xr++) {
	for (int xc=0; xc<xr; xc++) {
	  AtA[(yr*xnc+xr)*AtAsz + yc*xnc+xc] = AtA[(yr*xnc+xc)*AtAsz + yc*xnc+xr];
	}
      }
    }
  }
  //
  // Fill in lower diagonal tiles
  //
  for (int yr=0; yr<ync; yr++) {
    for (int yc=0; yc<yr; yc++) {
      for (int xr=0; xr<xnc; xr++) {
	for (int xc=0; xc<xnc; xc++) {
	  AtA[(yr*xnc+xr)*AtAsz + yc*xnc+xc] = AtA[(yc*xnc+xc)*AtAsz + yr*xnc+xr];
	}
      }
    }
  }
  /*
  NEWMAT::Matrix  AA(AtAsz,AtAsz);
  AA << AtA;
  cout << std::setprecision(20) << AA << endl;      
  */
}

void dctfield::AtB(const NEWMAT::Matrix&        Ax,
		   const NEWMAT::Matrix&        Ay,
		   const NEWMAT::Matrix&        Az,
                   const NEWMAT::Matrix&        Bx,
                   const NEWMAT::Matrix&        By,
                   const NEWMAT::Matrix&        Bz,
                   const NEWMAT::ColumnVector&  ima,
                   NEWMAT::Matrix&              AtB) const
{
  const double  *istore = ima.Store();
  double        *AtBp = AtB.Store();
  int           znc = Az.Ncols();
  int           xysz = Ax.Ncols()*Ay.Ncols();
  int           AtBsz = Ax.Ncols()*Ay.Ncols()*Az.Ncols();
  double        *AtB1p = new double[SQR(Ax.Ncols()*Ay.Ncols())];

  for (int z=0; z<Az.Nrows(); z++) {
    // Get contribution for this slice
    const double *iptr = &(istore[z*Ax.Nrows()*Ay.Nrows()]);
    one_slice_AtB(Ax,Ay,Bx,By,iptr,AtB1p);
    // Tile scaled versions of AtB1p
    for (int zr=0; zr<znc; zr++) {
      for (int zc=0; zc<znc; zc++) {
        double scl = Az.element(z,zr)*Bz.element(z,zc);
        for (int xyr=0; xyr<xysz; xyr++) {
          for (int xyc=0; xyc<xysz; xyc++) {
	    AtBp[(zr*xysz+xyr)*AtBsz + zc*xysz+xyc] += scl*AtB1p[xyr*xysz+xyc];
	  }
	}
      }
    }
  }

  delete[] AtB1p;
}

void dctfield::one_slice_AtB(const NEWMAT::Matrix&   Ax,
                             const NEWMAT::Matrix&   Ay,
                             const NEWMAT::Matrix&   Bx,
                             const NEWMAT::Matrix&   By,
                             const double            *ima,
                             double                  *AtB) const
{
  NEWMAT::Matrix           XtX(Ax.Ncols(),Bx.Ncols());
  NEWMAT::Matrix           Axt = Ax.t();
  NEWMAT::DiagonalMatrix   pima(Ax.Nrows());
  int                      xnc = Ax.Ncols();
  int                      ync = Ay.Ncols();
  int                      AtBsz = xnc*ync;

  memset(AtB,0,SQR(AtBsz)*sizeof(double));
  for (int my=0; my<By.Nrows(); my++) {
    const double *iptr = &(ima[my*Ax.Nrows()]);
    pima << iptr;
    XtX = Axt*pima*Bx;     
    double *XtXp = XtX.Store();
    // Now we tile scaled versions of XtX
    for (int yr=0; yr<ync; yr++) {
      for (int yc=0; yc<ync; yc++) {
        double scl = Ay.element(my,yr)*By.element(my,yc);
	for (int xr=0; xr<xnc; xr++) {
	  for (int xc=0; xc<xnc; xc++) {
            AtB[(yr*xnc+xr)*AtBsz + yc*xnc+xc] += scl*XtXp[xr*xnc+xc];
	  }
	}
      }
    }
  }
}

void dctfield::memen_H(NEWMAT::DiagonalMatrix&  mH) const
{
  
  mH = 0.0;
  for (int d=0; d<3; d++) {
    std::vector<int>  dv(3,0);
    dv[d] = 1;
    std::vector<DiagonalMatrix> AtAv(3);
    int csz[] = {CoefSz_x(), CoefSz_y(), CoefSz_z()};
    for (int dim=0; dim<3; dim++) {
      AtAv[dim] = NEWMAT::DiagonalMatrix(CoefSz_x());	
      for (int i=1; i<=csz[dim]; i++) {
        AtAv[dim](i) = DotProduct(dctbas[dim][dv[0]]->Column(i),dctbas[dim][dv[0]]->Column(i));
      }
    }
    mH += KP(AtAv[2],KP(AtAv[1],AtAv[0]));
  }      
}

} // End namespace BASISFIELD
