/*  Copyright (C) 2004 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
    
    
    LICENCE
    
    FMRIB Software Library, Release 5.0 (c) 2012, The University of
    Oxford (the "Software")
    
    The Software remains the property of the University of Oxford ("the
    University").
    
    The Software is distributed "AS IS" under this Licence solely for
    non-commercial use in the hope that it will be useful, but in order
    that the University as a charitable foundation protects its assets for
    the benefit of its educational and research purposes, the University
    makes clear that no condition is made or to be implied, nor is any
    warranty given or to be implied, as to the accuracy of the Software,
    or that it will be suitable for any particular purpose or for use
    under any specific conditions. Furthermore, the University disclaims
    all responsibility for the use which is made of the Software. It
    further disclaims any liability for the outcomes arising from using
    the Software.
    
    The Licensee agrees to indemnify the University and hold the
    University harmless from and against any and all claims, damages and
    liabilities asserted by third parties (including claims for
    negligence) which arise directly or indirectly from the use of the
    Software or the sale of any products based on the Software.
    
    No part of the Software may be reproduced, modified, transmitted or
    transferred in any form or by any means, electronic or mechanical,
    without the express permission of the University. The permission of
    the University is not required if the said reproduction, modification,
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    conditions of this Licence are imposed upon the receiver of the
    product, and all original and amended source code is included in any
    transmitted product. You may be held legally responsible for any
    copyright infringement that is caused or encouraged by your failure to
    abide by these terms and conditions.
    
    You are not permitted under this Licence to use this Software
    commercially. Use for which any financial return is received shall be
    defined as commercial use, and includes (1) integration of all or part
    of the source code or the Software into a product for sale or license
    by or on behalf of Licensee to third parties or (2) use of the
    Software or any derivative of it for research with the final aim of
    developing software products for sale or license to a third party or
    (3) use of the Software or any derivative of it for research with the
    final aim of developing non-software products for sale or license to a
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    Innovation Limited ("Isis"), the technology transfer company of the
    University, to negotiate a licence. Contact details are:
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#ifndef EXPOSE_TREACHEROUS
#define EXPOSE_TREACHEROUS
#endif

#include <iostream>
#include <cmath>
#include "miscmaths/miscmaths.h"
#include "newmat.h"
#include "dtifitOptions.h"
#include "newimage/newimageall.h"

using namespace std;
using namespace NEWMAT;
using namespace MISCMATHS;
using namespace DTIFIT;
using namespace NEWIMAGE;


const float maxfloat=1e10;
const float minfloat=1e-10;
const float maxlogfloat=23;
const float minlogfloat=-23;
const int maxint=1000000000; 

inline float PI() { return  3.14159265358979;}
inline float min(float a,float b){
  return a<b ? a:b;}
inline float max(float a,float b){
  return a>b ? a:b;}
inline Matrix Anis()
{ 
  Matrix A(3,3);
  A << 1 << 0 << 0
    << 0 << 0 << 0
    << 0 << 0 << 0;
  return A;
}

inline Matrix Is()
{ 
  Matrix I(3,3);
  I << 1 << 0 << 0
    << 0 << 1 << 0
    << 0 << 0 << 1;
  return I;
}

inline ColumnVector Cross(const ColumnVector& A,const ColumnVector& B)
{
  ColumnVector res(3);
  res << A(2)*B(3)-A(3)*B(2)
      << A(3)*B(1)-A(1)*B(3)
      << A(1)*B(2)-B(1)*A(2);
  return res;
}

inline Matrix Cross(const Matrix& A,const Matrix& B)
{
  Matrix res(3,1);
  res << A(2,1)*B(3,1)-A(3,1)*B(2,1)
      << A(3,1)*B(1,1)-A(1,1)*B(3,1)
      << A(1,1)*B(2,1)-B(1,1)*A(2,1);
  return res;
}

float mod(float a, float b){
  while(a>b){a=a-b;}
  while(a<0){a=a+b;}
  return a;
}



Matrix form_Amat(const Matrix& r,const Matrix& b)
{
  Matrix A(r.Ncols(),7);
  Matrix tmpvec(3,1), tmpmat;
  
  for( int i = 1; i <= r.Ncols(); i++){
    tmpvec << r(1,i) << r(2,i) << r(3,i);
    tmpmat = tmpvec*tmpvec.t()*b(1,i);
    A(i,1) = tmpmat(1,1);
    A(i,2) = 2*tmpmat(1,2);
    A(i,3) = 2*tmpmat(1,3);
    A(i,4) = tmpmat(2,2);
    A(i,5) = 2*tmpmat(2,3);
    A(i,6) = tmpmat(3,3);
    A(i,7) = 1;
  }
  return A;
}


Matrix form_Amat(const Matrix& r,const Matrix& b, const Matrix & cni )
{
  //cni are confound regressors of no interest
  Matrix A(r.Ncols(),7 + cni.Ncols());
  Matrix A_noconf(r.Ncols(),7);
  Matrix tmpvec(3,1), tmpmat;
  
  for( int i = 1; i <= r.Ncols(); i++){
    tmpvec << r(1,i) << r(2,i) << r(3,i);
    tmpmat = tmpvec*tmpvec.t()*b(1,i);   //this is the b-Matrix for direction i
    A(i,1) = tmpmat(1,1);
    A(i,2) = 2*tmpmat(1,2);
    A(i,3) = 2*tmpmat(1,3);
    A(i,4) = tmpmat(2,2);
    A(i,5) = 2*tmpmat(2,3);
    A(i,6) = tmpmat(3,3);
    A(i,7) = 1;
    
    A_noconf(i,1) = tmpmat(1,1);
    A_noconf(i,2) = 2*tmpmat(1,2);
    A_noconf(i,3) = 2*tmpmat(1,3);
    A_noconf(i,4) = tmpmat(2,2);
    A_noconf(i,5) = 2*tmpmat(2,3);
    A_noconf(i,6) = tmpmat(3,3);
    A_noconf(i,7) = 1;
    
    for( int col=1;col<=cni.Ncols();col++){
      A(i,col+7)=cni(i,col);
    }
  }
  
  
  Matrix tmp1=(A_noconf.t()*A_noconf).i();
  Matrix tmp2=(A.t()*A).i();
  cout<<"Efficiency loss due to confounds: xx xy xz yy yz zz"<<endl;
  for( int el=1;el<=6;el++)
    cout <<tmp2(el,el)/tmp1(el,el)<<" ";
  cout<<endl;

  return A;
}


inline SymmetricMatrix vec2tens(ColumnVector& Vec){
  SymmetricMatrix tens(3);
  tens(1,1)=Vec(1);
  tens(2,1)=Vec(2);
  tens(3,1)=Vec(3);
  tens(2,2)=Vec(4);
  tens(3,2)=Vec(5);
  tens(3,3)=Vec(6);
  return tens;
}




//Returns the pseudoinverse of the design matrix for performing Weighted Linear Least Squares
ReturnMatrix WLS_pinv(const Matrix& Amat, const ColumnVector& S)
{
  Matrix pinvA;
  DiagonalMatrix W(S.Nrows());                  //Weighting Matrix

  W=0;
  for (int i=1; i<=S.Nrows(); i++)
      W(i)=(S(i)>0 ? S(i)*S(i):1);             //Weights according to (Salvador, HBM 2005) 
 
  pinvA=(((Amat.t()*W)*Amat).i()*Amat.t())*W;  //WLS pseudoinverse of Amat
  pinvA.Release();
  return pinvA;
}



  
//Performs fitting of the tensor using a precalculated pseudoinverse of the design matrix (Amat_pinv)
//Depending on Amat_pinv, the function performs an OLS or WLS fiting of the DTI model.
void tensorfit(DiagonalMatrix& Dd,ColumnVector& evec1,ColumnVector& evec2,ColumnVector& evec3,float& f,float& s0,float& mode,ColumnVector& Dvec, float& sse, const Matrix& Amat, const Matrix& Amat_pinv, const ColumnVector& S)
{
  ColumnVector logS(S.Nrows());
  SymmetricMatrix tens;   //Basser's Diffusion Tensor;
  Matrix Vd;   //eigenvectors
  DiagonalMatrix Ddsorted(3);
  float mDd, fsquared;

  for (int i=1; i<=S.Nrows(); i++)
    {
      if(S(i)>0)
	logS(i)=log(S(i));
      else
	logS(i)=0;
    }
  Dvec=-Amat_pinv*logS;       //Estimate the model parameters
  
  if(Dvec(7)>-maxlogfloat )
    s0=exp(-Dvec(7));
  else
    s0=S.MaximumAbsoluteValue();
  
  for ( int i = 1; i <= S.Nrows(); i++)
    {
      if(s0<S.Sum()/S.Nrows()){ s0=S.MaximumAbsoluteValue();  }
      logS(i)=(S(i)/s0)>0.01 ? log(S(i)):log(0.01*s0);
    }
  Dvec = -Amat_pinv*logS;
  sse=(Amat*Dvec+logS).SumSquare();
  //sse = (W*(Amat*Dvec+logS)).SumSquare();   //In case of WLS, the weighted SSE will be evaluated, otherwise W=I, so OLS SSE is computed 
  
  s0=exp(-Dvec(7));
  if(s0<S.Sum()/S.Nrows()){ s0=S.Sum()/S.Nrows();  }
  tens = vec2tens(Dvec);
  
  EigenValues(tens,Dd,Vd);
  mDd = Dd.Sum()/Dd.Nrows();
  int maxind = Dd(1) > Dd(2) ? 1:2;   //finding max,mid and min eigenvalues
  maxind = Dd(maxind) > Dd(3) ? maxind:3;
  int midind;
  if( (Dd(1)>=Dd(2) && Dd(2)>=Dd(3)) || (Dd(1)<=Dd(2) && Dd(2)<=Dd(3)) ){midind=2;}
  else if( (Dd(2)>=Dd(1) && Dd(1)>=Dd(3)) || (Dd(2)<=Dd(1) && Dd(1)<=Dd(3)) ){midind=1;}
  else {midind=3;}
  int minind = Dd(1) < Dd(2) ? 1:2;   //finding minimum eigenvalue
  minind = Dd(minind) < Dd(3) ? minind:3;
  Ddsorted << Dd(maxind) << Dd(midind) << Dd(minind);
  Dd=Ddsorted;
  evec1 << Vd(1,maxind) << Vd(2,maxind) << Vd(3,maxind);
  evec2 << Vd(1,midind) << Vd(2,midind) << Vd(3,midind);
  evec3 << Vd(1,minind) << Vd(2,minind) << Vd(3,minind);

  float e1=Dd(maxind)-mDd, e2=Dd(midind)-mDd, e3=Dd(minind)-mDd;
  float n = (e1 + e2 - 2*e3)*(2*e1 - e2 - e3)*(e1 - 2*e2 + e3);
  float d = (e1*e1 + e2*e2 + e3*e3 - e1*e2 - e2*e3 - e1*e3);
  d = sqrt(MAX(0, d));
  d = 2*d*d*d;
  mode = MIN(MAX(d ? n/d : 0.0, -1),1);

  //Compute the FA  
  float numer=1.5*((Dd(1)-mDd)*(Dd(1)-mDd)+(Dd(2)-mDd)*(Dd(2)-mDd)+(Dd(3)-mDd)*(Dd(3)-mDd));  
  float denom=(Dd(1)*Dd(1)+Dd(2)*Dd(2)+Dd(3)*Dd(3));
 
  if(denom>0) fsquared=numer/denom;
  else fsquared=0;
  if(fsquared>0){f=sqrt(fsquared);}
  else{f=0;}
}


//Correct bvals/bvecs accounting for Gradient Nonlinearities
//ColumnVector grad_nonlin has 9 entries, corresponding to the 3 components of each of the x,y and z gradient deviation
void correct_bvals_bvecs(const Matrix& bvals,const Matrix& bvecs, const ColumnVector& grad_nonlin, const Matrix& Qform, const Matrix& Qform_inv, Matrix& bvals_c, Matrix& bvecs_c){
  bvals_c=bvals; bvecs_c=bvecs;
  Matrix L(3,3);  //gradient coil tensor
  float mag;
  L(1,1)=grad_nonlin(1);  L(1,2)=grad_nonlin(4);  L(1,3)=grad_nonlin(7);
  L(2,1)=grad_nonlin(2);  L(2,2)=grad_nonlin(5);  L(2,3)=grad_nonlin(8);
  L(3,1)=grad_nonlin(3);  L(3,2)=grad_nonlin(6);  L(3,3)=grad_nonlin(9);

  IdentityMatrix Id(3);
  
  for (int l=1; l<=bvals.Ncols(); l++){
    if (bvals(1,l)>0){ //do not correct b0s
      //Rotate bvecs to scanner's coordinate system
      ColumnVector bvec_tmp(3);
      bvec_tmp=Qform*bvecs.Column(l);
      bvec_tmp(1)=-bvec_tmp(1); //Sign-flip X coordinate

      //Correct for grad-nonlin in scanner's coordinate system
      bvecs_c.Column(l)=(Id+L)*bvec_tmp;//bvecs.Column(l);
      mag=sqrt(bvecs_c(1,l)*bvecs_c(1,l)+bvecs_c(2,l)*bvecs_c(2,l)+bvecs_c(3,l)*bvecs_c(3,l));
      if (mag!=0)
	bvecs_c.Column(l)=bvecs_c.Column(l)/mag;
      bvals_c(1,l)=mag*mag*bvals(1,l);
      bvec_tmp=bvecs_c.Column(l);

      //Rotate corrected bvecs back to voxel coordinate system
      bvec_tmp(1)=-bvec_tmp(1); //Sign-flip X coordinate
      bvecs_c.Column(l)=Qform_inv*bvec_tmp;
    }
  }
}


//Get the scale-free Qform matrix to rotate bvecs back to scanner's coordinate system 
//After applying this matrix, make sure to sign flip the x coordinate of the resulted bvecs!
//If you apply the inverse of the matrix, sign flip the x coordinate of the input bvecs
void Return_Qform(const Matrix& qform_mat, Matrix& QMat, const float xdim, const float ydim, const float zdim){ 
  Matrix QMat_tmp; DiagonalMatrix Scale(3);
   
  QMat_tmp=qform_mat.SubMatrix(1,3,1,3);
  Scale(1)=xdim; Scale(2)=ydim; Scale(3)=zdim;
  QMat_tmp=Scale.i()*QMat_tmp;
  QMat=QMat_tmp;
}



int main(int argc, char** argv)
{
  //parse command line
  dtifitOptions& opts = dtifitOptions::getInstance();
  int success=opts.parse_command_line(argc,argv);
  if(!success) return 1;
   if(opts.verbose.value()){
    cout<<"data file "<<opts.dtidatafile.value()<<endl;
    cout<<"mask file "<<opts.maskfile.value()<<endl;
    cout<<"bvecs     "<<opts.bvecsfile.value()<<endl;
    cout<<"bvals     "<<opts.bvalsfile.value()<<endl;
    if(opts.littlebit.value()){
      cout<<"min z     "<<opts.z_min.value()<<endl;
      cout<<"max z     "<<opts.z_max.value()<<endl;
      cout<<"min y     "<<opts.y_min.value()<<endl;
      cout<<"max y     "<<opts.y_max.value()<<endl;
      cout<<"min x     "<<opts.x_min.value()<<endl;
      cout<<"max x     "<<opts.x_max.value()<<endl;
    }
  }
  
  // Set random seed:
  Matrix r = read_ascii_matrix(opts.bvecsfile.value());
  if(r.Nrows()>3) r=r.t();
  for(int i=1;i<=r.Ncols();i++){
    float tmpsum=sqrt(r(1,i)*r(1,i)+r(2,i)*r(2,i)+r(3,i)*r(3,i));
    if(tmpsum!=0){
      r(1,i)=r(1,i)/tmpsum;
      r(2,i)=r(2,i)/tmpsum;
      r(3,i)=r(3,i)/tmpsum;
    }  
  }
  Matrix b = read_ascii_matrix(opts.bvalsfile.value());
  if(b.Nrows()>1) b=b.t();
  volume4D<float> data;
  volume<int> mask;
  if(opts.verbose.value()) cout<<"reading data"<<endl;
  read_volume4D(data,opts.dtidatafile.value());
  if(opts.verbose.value()) cout<<"reading mask"<<endl;
  read_volume(mask,opts.maskfile.value());
  if(opts.verbose.value()) cout<<"ok"<<endl;

  // check that the entries have the same dimensions
  if( b.Ncols() != r.Ncols() ){ cerr << "Error: bvecs and bvals don't have the same number of entries" << endl; return(-1);}
  if( r.Nrows() !=3 ){cerr << "Error: bvecs must be either 3xN or Nx3" << endl; return(-1);}
  if( data.tsize() != b.Ncols() ){cerr << "Error: data and bvals/bvecs do not contain the same number of entries" << endl;return(-1);}

  //Read Gradient Non_linearity Maps if provided
  volume4D<float> grad, bvalmap; Matrix Qform, Qform_inv;
  if (opts.grad_file.set()){
    read_volume4D(grad,opts.grad_file.value());
    //Get the scale-free Qform matrix to rotate bvecs back to scanner's coordinate system 
    Return_Qform(data.qform_mat(), Qform, data.xdim(), data.ydim(), data.zdim());
    Qform_inv=Qform.i();
  }

  int minx=opts.littlebit.value() ? opts.x_min.value():0;
  int maxx=opts.littlebit.value() ? opts.x_max.value():mask.xsize();
  int miny=opts.littlebit.value() ? opts.y_min.value():0;
  int maxy=opts.littlebit.value() ? opts.y_max.value():mask.ysize();
  int minz=opts.littlebit.value() ? opts.z_min.value():0;
  int maxz=opts.littlebit.value() ? opts.z_max.value():mask.zsize();
  cout<<minx<<" "<<maxx<<" "<<miny<<" "<<maxy<<" "<<minz<<" "<<maxz<<endl;
  if(opts.verbose.value()) cout<<"setting up vols"<<endl;
  volume<float> l1(maxx-minx,maxy-miny,maxz-minz);
  volume<float> l2(maxx-minx,maxy-miny,maxz-minz);
  volume<float> l3(maxx-minx,maxy-miny,maxz-minz);
  volume<float> MD(maxx-minx,maxy-miny,maxz-minz);
  volume<float> FA(maxx-minx,maxy-miny,maxz-minz);
  volume<float> S0(maxx-minx,maxy-miny,maxz-minz);
  volume<float> MODE(maxx-minx,maxy-miny,maxz-minz);
  volume4D<float> V1(maxx-minx,maxy-miny,maxz-minz,3);
  volume4D<float> V2(maxx-minx,maxy-miny,maxz-minz,3);
  volume4D<float> V3(maxx-minx,maxy-miny,maxz-minz,3);
  volume4D<float> Delements(maxx-minx,maxy-miny,maxz-minz,6);
  if (opts.save_bvals.value())
    bvalmap.reinitialize(maxx-minx,maxy-miny,maxz-minz,data.tsize());
  volume4D<float> cni_cope;
  volume<float> sse;


  if(opts.verbose.value()) cout<<"copying input properties to output volumes"<<endl;
  copybasicproperties(data[0],l1);
  copybasicproperties(data[0],l2);
  copybasicproperties(data[0],l3);
  copybasicproperties(data[0],MD);
  copybasicproperties(data[0],FA);
  copybasicproperties(data[0],S0);
  copybasicproperties(data[0],MODE);
  copybasicproperties(data[0],V1[0]);
  copybasicproperties(data[0],V2[0]);
  copybasicproperties(data[0],V3[0]);
  copybasicproperties(data[0],Delements[0]);
  if (opts.save_bvals.value()){
    copybasicproperties(data[0],bvalmap[0]);
    bvalmap=0;
  }

  if(opts.verbose.value()) cout<<"zeroing output volumes"<<endl;
  l1=0;l2=0;l3=0;MD=0;MODE=0;FA=0;S0=0;V1=0;V2=0;V3=0;Delements=0;
  if(opts.verbose.value()) cout<<"ok"<<endl;
  DiagonalMatrix evals(3);
  ColumnVector evec1(3),evec2(3),evec3(3);
  ColumnVector S(data.tsize());
  float fa,s0,mode,sseval;
  Matrix Amat, cni; 
  if(opts.verbose.value()) cout<<"Forming A matrix"<<endl;
  if(opts.cni.value()!=""){
    cni=read_ascii_matrix(opts.cni.value());
    Amat = form_Amat(r,b,cni);
    cni_cope.reinitialize(maxx-minx,maxy-miny,maxz-minz,cni.Ncols());
    copybasicproperties(data[0],cni_cope[0]);
    cni_cope=0;
  }
  else{
    Amat = form_Amat(r,b);
  }
  if(opts.sse.value()){
    sse.reinitialize(maxx-minx,maxy-miny,maxz-minz);
    copybasicproperties(data[0],sse);
    sse=0;
  }

  if(opts.verbose.value()) cout<<"starting the fits"<<endl;
  ColumnVector Dvec(7); Dvec=0; 
  Matrix pinv_Amat=pinv(Amat);

  for(int k = minz; k < maxz; k++){
    cout<<k<<" slices processed"<<endl;
      for(int j=miny; j < maxy; j++){
	for(int i =minx; i< maxx; i++){
	
	  if(mask(i,j,k)>0){
	    
	    for(int t=0;t < data.tsize();t++){
	      S(t+1)=data(i,j,k,t);
	    }
	    if (!opts.grad_file.set()){ //Check whether Gradient-Nonlinearities are considered. If not proceed as normal
	      if (opts.wls.value())
		pinv_Amat=WLS_pinv(Amat,S);
	    }
	    else{   //If they are, correct the bvals and bvecs and get a new Amat for each voxel
	      Matrix bvals_c, bvecs_c;
	      ColumnVector gradm(9);
	      for (int t=0; t<9; t++)
		gradm(t+1)=grad(i,j,k,t);
	      correct_bvals_bvecs(b,r, gradm,Qform,Qform_inv,bvals_c,bvecs_c);
	      if (opts.save_bvals.value()){
		for (int t=0; t<data.tsize(); t++)
		  bvalmap(i-minx,j-miny,k-minz,t)=bvals_c(1,t+1);
	      }
	      if(opts.cni.value()!="")
		Amat=form_Amat(bvecs_c,bvals_c,cni);
	      else
		Amat=form_Amat(bvecs_c,bvals_c);
	      pinv_Amat=pinv(Amat);
	      if (opts.wls.value())
		pinv_Amat=WLS_pinv(Amat,S);
	    }
	    tensorfit(evals,evec1,evec2,evec3,fa,s0,mode,Dvec,sseval,Amat,pinv_Amat,S);
	      
	    l1(i-minx,j-miny,k-minz)=evals(1);
	    l2(i-minx,j-miny,k-minz)=evals(2);
	    l3(i-minx,j-miny,k-minz)=evals(3);
	    MD(i-minx,j-miny,k-minz)=(evals(1)+evals(2)+evals(3))/3;
	    FA(i-minx,j-miny,k-minz)=fa;
	    S0(i-minx,j-miny,k-minz)=s0;
	    MODE(i-minx,j-miny,k-minz)=mode;
	    V1(i-minx,j-miny,k-minz,0)=evec1(1);
	    V1(i-minx,j-miny,k-minz,1)=evec1(2);
	    V1(i-minx,j-miny,k-minz,2)=evec1(3);
	    V2(i-minx,j-miny,k-minz,0)=evec2(1);
	    V2(i-minx,j-miny,k-minz,1)=evec2(2);
	    V2(i-minx,j-miny,k-minz,2)=evec2(3);
	    V3(i-minx,j-miny,k-minz,0)=evec3(1);
	    V3(i-minx,j-miny,k-minz,1)=evec3(2);
	    V3(i-minx,j-miny,k-minz,2)=evec3(3);
	    Delements(i-minx,j-miny,k-minz,0)=Dvec(1);
	    Delements(i-minx,j-miny,k-minz,1)=Dvec(2);
	    Delements(i-minx,j-miny,k-minz,2)=Dvec(3);
	    Delements(i-minx,j-miny,k-minz,3)=Dvec(4);
	    Delements(i-minx,j-miny,k-minz,4)=Dvec(5);
	    Delements(i-minx,j-miny,k-minz,5)=Dvec(6);
	    
 	    if(opts.cni.value()!=""){
 	      for(int iter=0;iter<cni.Ncols();iter++)
 		cni_cope(i-minx,j-miny,k-minz,iter)=Dvec(8+iter);
 	    }
	    if(opts.sse.value()){
	      sse(i-minx,j-miny,k-minz)=sseval;
	    }


//	    EigenValues(dyad,dyad_D,dyad_V);
	   

	    
//  	    // work out which is the maximum eigenvalue;
//  	    int maxeig;
//  	    if(dyad_D(1)>dyad_D(2)){
//  	      if(dyad_D(1)>dyad_D(3)) maxeig=1;
//  	      else maxeig=3;
//  	    }
//  	    else{
//  	      if(dyad_D(2)>dyad_D(3)) maxeig=2;
//  	      else maxeig=3;
//  	    }
//  	    dyadic_vecs(i-minx,j-miny,k-minz,0)=dyad_V(1,maxeig);
//  	    dyadic_vecs(i-minx,j-miny,k-minz,1)=dyad_V(2,maxeig);
//  	    dyadic_vecs(i-minx,j-miny,k-minz,2)=dyad_V(3,maxeig);
	    



	  }
	}
      }
  }
  
    string fafile=opts.ofile.value()+"_FA";
    string s0file=opts.ofile.value()+"_S0";
    string l1file=opts.ofile.value()+"_L1";
    string l2file=opts.ofile.value()+"_L2";
    string l3file=opts.ofile.value()+"_L3";
    string v1file=opts.ofile.value()+"_V1";
    string v2file=opts.ofile.value()+"_V2";
    string v3file=opts.ofile.value()+"_V3";
    string MDfile=opts.ofile.value()+"_MD";
    string MOfile=opts.ofile.value()+"_MO";
    string tensfile=opts.ofile.value()+"_tensor";
    if(opts.littlebit.value()){
      fafile+="littlebit";
      s0file+="littlebit";
      l1file+="littlebit";
      l2file+="littlebit";
      l3file+="littlebit";
      v1file+="littlebit";
      v2file+="littlebit";
      v3file+="littlebit";
      MDfile+="littlebit";
      MOfile+="littlebit";
      tensfile+="littlebit";
    }

    FA.setDisplayMaximumMinimum(1,0);
    save_volume(FA,fafile);
    S0.setDisplayMaximumMinimum(S0.max(),0);
    save_volume(S0,s0file);
    MODE.setDisplayMaximumMinimum(1,-1);
    save_volume(MODE,MOfile);
    V1.setDisplayMaximumMinimum(1,-1);
    save_volume4D(V1,v1file);
    V2.setDisplayMaximumMinimum(1,-1);
    save_volume4D(V2,v2file);
    V3.setDisplayMaximumMinimum(1,-1);
    save_volume4D(V3,v3file);
    l1.setDisplayMaximumMinimum(l1.max(),0);
    save_volume(l1,l1file);
    l2.setDisplayMaximumMinimum(l1.max(),0);
    save_volume(l2,l2file);
    l3.setDisplayMaximumMinimum(l1.max(),0);
    save_volume(l3,l3file);
    MD.setDisplayMaximumMinimum(l1.max(),0);
    save_volume(MD,MDfile);

    if(opts.savetensor.value()) {
      Delements.setDisplayMaximumMinimum(l1.max(),0);
      save_volume4D(Delements,tensfile);
    }

    if(opts.save_bvals.value()) {
      bvalmap.setDisplayMaximumMinimum(bvalmap.max(),0);
      string tmpfile=opts.ofile.value()+"_bvals";
      save_volume4D(bvalmap,tmpfile);
    }

    if(opts.cni.value()!=""){
      string cnifile=opts.ofile.value()+"_cnicope";
      if(opts.littlebit.value()){
	cnifile+="littlebit";
      }
      cni_cope.setDisplayMaximumMinimum(cni_cope.max(),0);
      save_volume4D(cni_cope,cnifile);
    }
    if(opts.sse.value()){
      string ssefile=opts.ofile.value()+"_sse";
      if(opts.littlebit.value()){
	ssefile+="littlebit";
      }
      sse.setDisplayMaximumMinimum(sse.max(),0);
      save_volume(sse,ssefile);
    }
  return 0;
}