Chimie Théorique » Opt'n Path

SUBROUTINE ConvertBakerInternal_cart(IntCoord_k,IntCoord,x_k,y_k,z_k,x,y,z,XPrim,XPrimRef)

!================================================================

! Converts the positions in Baker Coordinates to cartesian coordinates

!================================================================

!

! Input:

!    Incoord_k(NCoord) REAL: Starting internal coordinates

!    IntCoord(NCoord) REAL: Coordinate to convert to cartesian coordinates

!    x_k,y_k,z_k(Nat) REAL: Starting cartesian geometry

!    XPrimRef(NPrim) REAL: Reference values for Primitives coordinates (mainly for dihedral)

!

! Output:

!    x,y,z(Nat) REAL: Cartesian coordinates corresponding to IntCoord

!    XPrim(NPrim) REAL: Primitives for the cartesian coordinates. (This is a by-product)

!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

! BTransInv,UMat should be passed as arguments of this subroutine.

  ! IdxGeom: geometry index.

  ! Internal coordinates IntCoord(NCoord) is to be converted

  ! into Cartesian coordinates x(Nat),y(Nat),z(Nat).

!----------------------------------------------------------------------

!  Copyright 2003-2014 Ecole Normale Supérieure de Lyon,

!  Centre National de la Recherche Scientifique,

!  Université Claude Bernard Lyon 1. All rights reserved.

!

!  This work is registered with the Agency for the Protection of Programs

!  as IDDN.FR.001.100009.000.S.P.2014.000.30625

!

!  Authors: P. Fleurat-Lessard, P. Dayal

!  Contact: optnpath@gmail.com

!

! This file is part of "Opt'n Path".

!

!  "Opt'n Path" is free software: you can redistribute it and/or modify

!  it under the terms of the GNU Affero General Public License as

!  published by the Free Software Foundation, either version 3 of the License,

!  or (at your option) any later version.

!

!  "Opt'n Path" is distributed in the hope that it will be useful,

!  but WITHOUT ANY WARRANTY; without even the implied warranty of

!

!  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

!  GNU Affero General Public License for more details.

!

!  You should have received a copy of the GNU Affero General Public License

!  along with "Opt'n Path". If not, see <http://www.gnu.org/licenses/>.

!

! Contact The Office of Technology Licensing, valorisation@ens-lyon.fr,

! for commercial licensing opportunities.

!----------------------------------------------------------------------

  use Path_module, only : Nat,AtName,BMat_BakerT,NPrim,&

       BBT,BBT_inv,BprimT,ScanCoord,Coordinate,&

       BTransInv_local,Xprimitive_t,&

       NCoord,UMat_local

  ! UMat_local is allocated in Calc_baker.f90

  ! XyzGeomI(NGeomI,3,Nat),BMat_BakerT(3*Nat,NCoord),a0=0.529177249d0

  Use Io_Module

  use VarTypes

  IMPLICIT NONE

  REAL(KREAL), INTENT(OUT) :: x(Nat),y(Nat),z(Nat)

  REAL(KREAL), INTENT(IN) :: x_k(Nat),y_k(Nat),z_k(Nat)

  REAL(KREAL), INTENT(IN) :: IntCoord(NCoord)

  REAL(KREAL), INTENT(INOUT) ::  IntCoord_k(NCoord)

  REAL(KREAL), INTENT(IN) :: XPrimRef(NPrim)

  REAL(KREAL), INTENT(OUT) :: XPrim(NPrim)

  ! IdxGeom: geometry index.

  Integer(KINT) :: I, J, Counter

  REAL(KREAL) :: normDeltaX_int

  REAL(KREAL), ALLOCATABLE :: DeltaX_int(:)  !DeltaX_int(NPrim,3*Nat-6), 3*Nat-6??

  REAL(KREAL), ALLOCATABLE :: DeltaX_cart(:) !DeltaX_cart(3*Nat)

  REAL(KREAL), ALLOCATABLE :: Geom(:,:) !(3,Nat)

  REAL(KREAL), ALLOCATABLE :: X_cart_k(:,:) ! (3,Nat)

  REAL(KREAL), ALLOCATABLE :: GMat(:,:) !(NPrim,NPrim)

  REAL(KREAL), ALLOCATABLE :: EigVec(:,:), EigVal(:) ! EigVec(NPrim,NPrim)

  REAL(KREAL), ALLOCATABLE :: UMat_tmp(:,:)

  REAL(KREAL) :: Angle, angle_d

  REAL(KREAL), PARAMETER :: Crit=1e-08

  EXTERNAL Angle, angle_d

  LOGICAL :: debug, FAIL

  INTEGER(KINT), PARAMETER :: NbItMax=50

  INTERFACE

     function valid(string) result (isValid)

       CHARACTER(*), intent(in) :: string

       logical                  :: isValid

     END function VALID

     SUBROUTINE Calc_Xprim(nat,x,y,z,Coordinate,NPrim,XPrimitive,XPrimRef)

       !

       ! This subroutine uses the description of a list of Coordinates

       ! to compute the values of the coordinates for a given geometry.

       !

!!!!!!!!!!

       ! Input:

       !   Na: INTEGER, Number of atoms

       !  x,y,z(Na): REAL, cartesian coordinates of the considered geometry

       ! Coordinate (Pointer(ListCoord)): description of the wanted coordiantes

       ! NPrim, INTEGER: Number of coordinates to compute

       !

       ! Optional: XPrimRef(NPrim) REAL: array that contains coordinates values for

       ! a former geometry. Useful for Dihedral angles evolution...

!!!!!!!!!!!

       ! Output:

       ! XPrimimite(NPrim) REAL: array that will contain the values of the coordinates

       !

!!!!!!!!!

       Use VarTypes

       Use Io_module

       Use Path_module, only : pi

       IMPLICIT NONE

       Type (ListCoord), POINTER :: Coordinate

       INTEGER(KINT), INTENT(IN) :: Nat,NPrim

       REAL(KREAL), INTENT(IN) :: x(Nat), y(Nat), z(Nat)

       REAL(KREAL), INTENT(IN), OPTIONAL :: XPrimRef(NPrim)

       REAL(KREAL), INTENT(OUT) :: XPrimitive(NPrim)

     END SUBROUTINE CALC_XPRIM

  END INTERFACE

  debug=valid('ConvertBakerInternal_cart')

  if (debug) WRITE(*,*) '=======Entering ConvertBakerInternal_cart======='

  FAIL = .FALSE.

!!!!!!

  ! Allocation phase

  ALLOCATE(DeltaX_int(NCoord),DeltaX_cart(3*Nat))

  ALLOCATE(UMat_tmp(NPrim,NCoord))

  ALLOCATE(X_cart_k(3,Nat))

  ALLOCATE(Geom(3,Nat),BprimT(3*Nat,NPrim))

  ALLOCATE(BBT(NCoord,NCoord))

  ALLOCATE(BBT_inv(NCoord,NCoord))

  ALLOCATE(Gmat(NPrim,NPrim))

  ALLOCATE(EigVal(NPrim),EigVec(NPrim,NPrim))

  if (debug) THEN

     WRITE(*,*) "Checking purposes...."

     WRITE(*,*) "Trying ot convert Xint initial (IntCoord)"

     WRITE(*,'(50(1X,F12.8))') IntCoord(:)

     WRITE(*,*) "BTransInv_local"

     DO J=1,3*Nat

        WRITE(*,'(50(1X,F12.8))') BTransInv_local(:,J)

     END DO

     WRITE(*,*) "Xint initial (IntCoord_k)"

     WRITE(*,'(50(1X,F12.8))') IntCoord_k(:)

     WRITE(*,*) "Cartesian coordinates"

     WRITE(*,*) Nat

     WRITE(*,*) 'GeomCart in ConvertBakerInternal_cart'

     DO I=1,Nat

        WRITE(*,'(1X,A,I4,3(1X,F12.4))') AtName(I),I,X_k(I),Y_k(i),Z_k(i)

     END DO

     WRITE(*,*) "Calculating actual values using x_k,y_k,z_k"

!     WRITE(*,*) "First, with Calc_XPrim"

!     WRITE(*,*) "Coordinate:",associated(Coordinate)

     Call Calc_Xprim(nat,x_k,y_k,z_k,Coordinate,NPrim,XPrimitive_t,XPrimRef)

!      I=0 ! index for the NPrim (NPrim is the number of ! primitive coordinates).

!      ScanCoord=>Coordinate

!      DO WHILE (Associated(ScanCoord%next))

!         I=I+1

!         SELECT CASE (ScanCoord%Type)

!         CASE ('BOND')

!            Print *, I, ':',  ScanCoord%At1, '-', ScanCoord%At2, '=', Xprimitive_t(I)

!         CASE ('ANGLE')

!            Print *, I, ':', ScanCoord%At1, '-', ScanCoord%At2,'-',ScanCoord%At3, '=', Xprimitive_t(I)*180./Pi

!         CASE ('DIHEDRAL')

!            Print *, I, ':',  ScanCoord%At1, '-',ScanCoord%At2,'-',ScanCoord%At3,'-',&

!            ScanCoord%At4,'=',Xprimitive_t(I)*180./Pi

!         END SELECT

!         ScanCoord => ScanCoord%next

!      END DO ! matches DO WHILE (Associated(ScanCoord%next))

!      WRITE(*,*) "Second with normal proc"

!      I=0 ! index for the NPrim (NPrim is the number of ! primitive coordinates).

!      Xprimitive_t=0.d0

!      ScanCoord=>Coordinate

!      DO WHILE (Associated(ScanCoord%next))

!         I=I+1

!         SELECT CASE (ScanCoord%Type)

!         CASE ('BOND')

!            Call vecteur(ScanCoord%At2,ScanCoord%At1,x_k,y_k,z_k,vx2,vy2,vz2,Norm2)

!            Xprimitive_t(I) = Norm2

!            Print *, I, ':',  ScanCoord%At1, '-', ScanCoord%At2, '=', Xprimitive_t(I)

!         CASE ('ANGLE')

!            Call vecteur(ScanCoord%At2,ScanCoord%At3,x_k,y_k,z_k,vx1,vy1,vz1,Norm1)

!            Call vecteur(ScanCoord%At2,ScanCoord%At1,x_k,y_k,z_k,vx2,vy2,vz2,Norm2)

!            Xprimitive_t(I) = angle(vx1,vy1,vz1,Norm1,vx2,vy2,vz2,Norm2)*Pi/180.

!            Print *, I, ':', ScanCoord%At1, '-', ScanCoord%At2,'-',ScanCoord%At3, '=', Xprimitive_t(I)*180./Pi

!         CASE ('DIHEDRAL')

!            Call vecteur(ScanCoord%At2,ScanCoord%At1,x_k,y_k,z_k,vx1,vy1,vz1,Norm1)

!            Call vecteur(ScanCoord%At2,ScanCoord%At3,x_k,y_k,z_k,vx2,vy2,vz2,Norm2)

!            Call vecteur(ScanCoord%At3,ScanCoord%At4,x_k,y_k,z_k,vx3,vy3,vz3,Norm3)

!            Call produit_vect(vx3,vy3,vz3,vx2,vy2,vz2,vx5,vy5,vz5,norm5)

!            Call produit_vect(vx1,vy1,vz1,vx2,vy2,vz2,vx4,vy4,vz4,norm4)

! !!! PFL 28 Feb 2008 Test to be sure that angle does not change by more than Pi

!            !           Xprimitive_t(I)=angle_d(vx4,vy4,vz4,norm4,vx5,vy5,vz5,norm5,vx2,vy2,vz2,norm2)*Pi/180.

!            DiheTmp= angle_d(vx4,vy4,vz4,norm4,vx5,vy5,vz5,norm5, &

!                 vx2,vy2,vz2,norm2)

!            Xprimitive_t(I) = DiheTmp*Pi/180.

!            ! We treat large dihedral angles differently as +180=-180 mathematically and physically

!            ! but this causes lots of troubles when converting baker to cart.

!            ! So we ensure that large dihedral angles always have the same sign

!            if (abs(ScanCoord%SignDihedral).NE.1) THEN

!               ScanCoord%SignDihedral=Int(Sign(1.,DiheTmp))

!            ELSE

!               If ((abs(DiheTmp).GE.170.D0).AND.(Sign(1.,DiheTmp)*ScanCoord%SignDihedral<0)) THEN

!                  Xprimitive_t(I) = DiheTmp*Pi/180.+ ScanCoord%SignDihedral*2.*Pi

!               END IF

!            END IF

!            IF (abs(Xprimitive_t(I)-XPrimRef(I)).GE.Pi) THEN

!               if ((Xprimitive_t(I)-XPrimRef(I)).GE.Pi) THEN

!                  Xprimitive_t(I)=Xprimitive_t(I)-2.d0*Pi

!               ELSE

!                  Xprimitive_t(I)=Xprimitive_t(I)+2.d0*Pi

!               END IF

!            END IF

!            Print *, I, ':',  ScanCoord%At1, '-',ScanCoord%At2,'-',ScanCoord%At3,'-',&

!            ScanCoord%At4,'=',Xprimitive_t(I)*180./Pi

!         END SELECT

!         ScanCoord => ScanCoord%next

!      END DO ! matches DO WHILE (Associated(ScanCoord%next))

     IntCoord_k=0.d0

     DO I=1, NPrim

        ! Transpose of UMat is needed below, that is why UMat(I,:).

        IntCoord_k(:)=IntCoord_k(:)+UMat_local(I,:)*Xprimitive_t(I)

     END DO

     WRITE(*,*) "Xint (intCoord_k) cooresponding to x_k,y_k,z_k"

     WRITE(*,'(50(1X,F12.8))') IntCoord_k(:)

     WRITE(*,*) "UMat_local"

     DO I=1, NPrim

        WRITE(*,'(50(1X,F12.8))') UMat_local(I,:)

     END DO

     !     Geom(1,:)=X_k(1:Nat)/a0

     !     Geom(2,:)=y_k(1:Nat)/a0

     !     Geom(3,:)=z_k(1:Nat)/a0

     Geom(1,:)=X_k(1:Nat)

     Geom(2,:)=y_k(1:Nat)

     Geom(3,:)=z_k(1:Nat)

     ! Computing B^prim:

     BprimT=0.d0

     ScanCoord=>Coordinate

     I=0

     DO WHILE (Associated(ScanCoord%next))

        I=I+1

        SELECT CASE (ScanCoord%Type)

        CASE ('BOND')

           CALL CONSTRAINTS_BONDLENGTH_DER(Nat,ScanCoord%at1,ScanCoord%AT2,Geom,BprimT(1,I))

        CASE ('ANGLE')

           CALL CONSTRAINTS_BONDANGLE_DER(Nat,ScanCoord%At1,ScanCoord%AT2,ScanCoord%At3,Geom,BprimT(1,I))

        CASE ('DIHEDRAL')

           CALL CONSTRAINTS_TORSION_DER2(Nat,ScanCoord%At1,ScanCoord%AT2,ScanCoord%At3,ScanCoord%At4,Geom,BprimT(1,I))

        END SELECT

        ScanCoord => ScanCoord%next

     END DO

     !     if (debug) THEN

     !        WRITE(*,*) "PFL DBG, I,NPrim,BPrimT",I,NPrim

     !        DO I=1,NPrim

     !           WRITE(*,'(50(1X,F12.6))') BPrimT(:,I)

     !        END DO

     !     END IF

     BMat_BakerT = 0.d0

     DO I=1,NCoord

        DO J=1,NPrim

           !BprimT is transpose of B^prim.

           !B = UMat^T B^prim, B^T = (B^prim)^T UMat

           BMat_BakerT(:,I)=BMat_BakerT(:,I)+BprimT(:,J)*UMat_local(J,I)

        END DO

     END DO

     BBT = 0.d0

     DO I=1,NCoord

        DO J=1,3*Nat   ! BBT(:,I) forms BB^T

           BBT(:,I) = BBT(:,I) + BMat_BakerT(J,:)*BMat_BakerT(J,I)

        END DO

     END DO

     BBT_inv = 0.d0

     !Print *, 'NCoord=', NCoord

     !Print *, 'BBT='

     DO J=1,NCoord

        ! WRITE(*,'(50(1X,F12.6))') BBT(:,J)

     END DO

     !Print *, 'End of BBT'

     ! GenInv is in Mat_util.f90

     Call GenInv(NCoord,BBT,BBT_inv,NCoord)

!     ALLOCATE(V(NCoord,NCoord))

!     tol = 1e-12

!     ! BBT is destroyed by GINVSE

!     Call GINVSE(BBT,NCoord,NCoord,BBT_inv,NCoord,NCoord,NCoord,tol,V,NCoord,FAIL,IOOUT)

!     DEALLOCATE(V)

!     IF(Fail) Then

!        WRITE (*,*) "Failed in generalized inverse, L220, ConvertBaker...f90"

!        STOP

!     END IF

     !Print *, 'BBT_inv='

     DO J=1,NCoord

        ! WRITE(*,'(50(1X,F10.2))') BBT_inv(:,J)

        ! Print *, BBT_inv(:,J)

     END DO

     !Print *, 'End of BBT_inv'

     ! Calculation of (B^T)^-1 = (BB^T)^-1B:

     BTransInv_local = 0.d0

     DO I=1,3*Nat

        DO J=1,NCoord

           BTransInv_local(:,I)=BTransInv_local(:,I)+BBT_inv(:,J)*BMat_BakerT(I,J)

        END DO

     END DO

     !Print *, 'BMat_BakerT='

     DO J=1,3*Nat

        !WRITE(*,'(50(1X,F12.8))') BMat_BakerT(:,J)

     END DO

     !Print *, 'End of BMat_BakerT'

     WRITE(*,*) "BTransInv_local Trans corresponding to x_k,y_k,z_k"

     DO J=1,3*Nat

        WRITE(*,'(50(1X,F12.8))') BTransInv_local(:,J)

     END DO

  END IF

  DeltaX_int(:) = IntCoord(:)-IntCoord_k(:)

  X_cart_k(1,:) = x_k(:)

  X_cart_k(2,:) = y_k(:)

  X_cart_k(3,:) = z_k(:)

  normDeltaX_int=0.d0 ! This is to be implemented.

  DO I=1, NCoord

     normDeltaX_int=normDeltaX_int+DeltaX_int(I)*DeltaX_int(I)

  END DO

  normDeltaX_int = sqrt(normDeltaX_int)

  ! I just need initial value of normDeltaX_int to be .GT. 1d-11,

  ! that is why it is initialized to 1.d0

  !normDeltaX_int = 1.d0

  if (debug) WRITE(*,*) "Entering the loop"

  Counter = 0

  DO While ((normDeltaX_int .GT. Crit) .AND. (Counter .LT. NbItMax))

     !DO While (normDeltaX_int .GT. 1d-6)

     Counter = Counter + 1

     DeltaX_cart = 0.d0

!     if (normDeltaX_int.LE.1e-4) THEN

!        DeltaX_int=DeltaX_int*1e4

!     END IF

     DO I=1,NCoord

        ! below BTransInv_local(I,:) is used because actually we need Transpose of BTransInv_local.

        DeltaX_cart(:)=DeltaX_cart(:)+BTransInv_local(I,:)*DeltaX_int(I)

     END DO

!     if (normDeltaX_int.LE.1e-4) THEN

!        DeltaX_int=DeltaX_int*1e-4

!     DeltaX_cart=DeltaX_cart*1e-4

!     END IF

           if (debug) THEN

              WRITE(*,*) "Info for iteration:",counter

              Print *, 'DeltaX_int='

              WRITE(*,'(50(1X,F12.8))') DeltaX_int

              Print *, 'DeltaX_cart,norm',sqrt(dot_product(DeltaX_cart,DeltaX_cart))

              DO J=1,Nat

              WRITE(*,'(1X,A4,3(1X,F15.11),3(1X,D25.15))') AtName(J),DeltaX_cart(3*J-2:3*J),DeltaX_cart(3*J-2:3*J)

              END DO

              Print *, 'BTransInv_local Trans='

              DO J=1,3*Nat

                 WRITE(*,'(50(1X,F12.8))') BTransInv_local(:,J)

              END DO

              Print *, 'DeltaX_int='

              WRITE(*,'(50(1X,F12.8))') DeltaX_int

           END IF

     ! Finite precision error correction step:

!     DO I=1,3*Nat

!        IF (DeltaX_cart(I) .NE. 0.d0) Then

!           IF(abs(DeltaX_cart(I)) .LT. 1d-10) Then

!              !Print *, 'Correcting DeltaX_cart(',I,')=', DeltaX_cart(I)

!              DeltaX_cart(I) = 0.d0

!           END IF

!        END IF

!     END DO

     ! new cartesian coordinates:

     DO I=1, Nat

        X_cart_k(1,I) = X_cart_k(1,I) + DeltaX_cart(3*I-2)

        X_cart_k(2,I) = X_cart_k(2,I) + DeltaX_cart(3*I-1)

        X_cart_k(3,I) = X_cart_k(3,I) + DeltaX_cart(3*I)

     END DO

     !     Geom(1,:)=X_cart_k(1,1:Nat)/a0

     !     Geom(2,:)=X_cart_k(2,1:Nat)/a0

     !     Geom(3,:)=X_cart_k(3,1:Nat)/a0

     Geom(1,:)=X_cart_k(1,1:Nat)

     Geom(2,:)=X_cart_k(2,1:Nat)

     Geom(3,:)=X_cart_k(3,1:Nat)

     if (debug) THEN

     WRITE(*,*) 'GeomCart used to compute BPrim'

     DO I=1,Nat

        WRITE(*,'(1X,A,I4,3(1X,F12.4))') AtName(I),I,Geom(1,I),Geom(2,i),Geom(3,i)

     END DO

     END IF

     ! Computing B^prim:

     BprimT=0.d0

     ScanCoord=>Coordinate

     I=0

     DO WHILE (Associated(ScanCoord%next))

        I=I+1

        SELECT CASE (ScanCoord%Type)

        CASE ('BOND')

           CALL CONSTRAINTS_BONDLENGTH_DER(Nat,ScanCoord%at1,ScanCoord%AT2,Geom,BprimT(1,I))

        CASE ('ANGLE')

           CALL CONSTRAINTS_BONDANGLE_DER(Nat,ScanCoord%At1,ScanCoord%AT2,ScanCoord%At3,Geom,BprimT(1,I))

        CASE ('DIHEDRAL')

           CALL CONSTRAINTS_TORSION_DER2(Nat,ScanCoord%At1,ScanCoord%AT2,ScanCoord%At3,ScanCoord%At4,Geom,BprimT(1,I))

        END SELECT

        ScanCoord => ScanCoord%next

     END DO

     if (debug) THEN

        WRITE(*,*) "Bprim "

        DO J=1,3*Nat

           WRITE(*,'(50(1X,F12.6))') BprimT(J,:)

        END DO

     END IF

     BMat_BakerT = 0.d0

     DO I=1,NCoord

        DO J=1,NPrim

           !BprimT is transpose of B^prim.

           !B = UMat^T B^prim, B^T = (B^prim)^T UMat

           BMat_BakerT(:,I)=BMat_BakerT(:,I)+BprimT(:,J)*UMat_local(J,I)

        END DO

     END DO

     ! ADDED FROM HERE:

     ! We now compute G=B(BT) matrix

     !IF (IOptt .EQ. 5000) Then

     !GMat=0.d0

     !DO I=1,NPrim

     !  DO J=1,3*Nat

     !    GMat(:,I)=Gmat(:,I)+BprimT(J,:)*BprimT(J,I) !*1.d0/mass(atome(int(K/3.d0)))

     !END DO

     !END DO

     ! We diagonalize G

     !Call Jacobi(GMat,NPrim,EigVal,EigVec,NPrim)

     !Call Trie(NPrim,EigVal,EigVec,NPrim)

     ! We construct the new DzDc(b=baker) matrix

     ! UMat is nonredundant vector set, i.e. set of eigenvectors of

     !  BB^T corresponding to eigenvalues > zero.

     !UMat=0.d0

     !UMat_tmp=0.d0

     !BMat_BakerT = 0.d0

     !J=0

     !DO I=1,NPrim

     !  IF (abs(eigval(I))>=1e-6) THEN

     !   J=J+1

     !  DO K=1,NPrim

     ! BprimT is transpose of B^prim.

     ! B = UMat^T B^prim, B^T = (B^prim)^T UMat

     !BMat_BakerT(:,J)=BMat_BakerT(:,J)+BprimT(:,K)*Eigvec(K,I)

     ! END DO

     !IF(J .GT. 3*Nat-6) THEN

     !WRITE(*,*) 'Number of vectors in Eigvec with eigval .GT. &

     !    1e-6 (=UMat) (=' ,J,') exceeded 3*Nat-6=',3*Nat-6, &

     !    'Stopping the calculation.'

     !   STOP

     !  END IF

     ! UMat_tmp(:,J) =  Eigvec(:,I)

     ! END IF

     !END DO

     ! THIS IS TO BE CORRECTED, A special case for debugging C2H3F case:

     !J=0

     !DO I=1, 3*Nat-6

     ! IF ((I .NE. 6) .AND. (I .NE. 7) .AND. (I .NE. 9)) Then

     !  J=J+1

     ! Print *, 'J=', J, ' I=', I

     !UMat(:,J) = UMat_tmp(:,I)

     !     END IF

     ! END DO

     !BMat_BakerT=0.d0

     !    DO I=1,NCoord

     !      DO J=1,NPrim

     ! B = UMat^T B^prim, B^T = (B^prim)^T UMat

     !       BMat_BakerT(:,I)=BMat_BakerT(:,I)+BprimT(:,J)*UMat(J,I)

     !    END DO

     !END DO

     ! TO BE CORRECTED, ENDS HERE.

     !END IF

     ! END of the new changes.

     BBT = 0.d0

     DO I=1,NCoord

        DO J=1,3*Nat   ! BBT(:,I) forms BB^T

           BBT(:,I) = BBT(:,I) + BMat_BakerT(J,:)*BMat_BakerT(J,I)

        END DO

     END DO

     BBT_inv = 0.d0

     !Print *, 'NCoord=', NCoord

     !Print *, 'BBT='

     DO J=1,NCoord

        ! WRITE(*,'(50(1X,F12.6))') BBT(:,J)

     END DO

     !Print *, 'End of BBT'

     ! GenInv is in Mat_util.f90

     Call GenInv(NCoord,BBT,BBT_inv,NCoord)

     !     if (debug) THEN

     !        WRITE(*,*) 'BBT_inv by GenInv'

     !        DO J=1,NCoord

     !           WRITE(*,'(50(1X,F12.6))') BBT_inv(:,J)

     !        END DO

     !     END IF

!    ALLOCATE(V(NCoord,NCoord))

!    tol = 1e-12

!    ! BBT is destroyed by GINVSE

!    Call GINVSE(BBT,NCoord,NCoord,BBT_inv,NCoord,NCoord,NCoord,tol,V,NCoord,FAIL,IOOUT)

!    DEALLOCATE(V)

!    IF(Fail) Then

!       WRITE (*,*) "Failed in generalized inverse, L220, ConvertBaker...f90"

!       STOP

!    END IF

     !     if (debug) THEN

     !        WRITE(*,*) 'BBT_inv by Genvse'

     !        DO J=1,NCoord

     !           WRITE(*,'(50(1X,F12.6))') BBT_inv(:,J)

     !        END DO

     !     END IF

     !Print *, 'End of BBT_inv'

     ! Calculation of (B^T)^-1 = (BB^T)^-1B:

     BTransInv_local = 0.d0

     DO I=1,3*Nat

        DO J=1,NCoord

           BTransInv_local(:,I)=BTransInv_local(:,I)+BBT_inv(:,J)*BMat_BakerT(I,J)

        END DO

     END DO

     !     if (debug) THEN

     !        Print *, 'BMat_BakerT='

     !        DO J=1,3*Nat

     !           WRITE(*,'(50(1X,F12.6))') BMat_BakerT(:,J)

     !        END DO

     !        Print *, 'End of BMat_BakerT'

     !     END IF

     !      if (debug) THEN

     !         Print *, 'BTransInv_local Trans='

     !         DO J=1,3*Nat

     !            WRITE(*,'(50(1X,F16.6))') BTransInv_local(:,J)

     !         END DO

     !         Print *, 'End of BTransInv_local Trans'

     !      END IF

     ! New cartesian cooordinates:

     x(:) = X_cart_k(1,:)

     y(:) = X_cart_k(2,:)

     z(:) = X_cart_k(3,:)

     Call Calc_Xprim(nat,x,y,z,Coordinate,NPrim,XPrimitive_t,XPrimRef)

!      I=0 ! index for the NPrim (NPrim is the number of

!      ! primitive coordinates).

!      Xprimitive_t=0.d0

!      ScanCoord=>Coordinate

!      DO WHILE (Associated(ScanCoord%next))

!         I=I+1

!         SELECT CASE (ScanCoord%Type)

!         CASE ('BOND')

!            Call vecteur(ScanCoord%At2,ScanCoord%At1,x,y,z,vx2,vy2,vz2,Norm2)

!            Xprimitive_t(I) = Norm2

!            !Print *, I, ':',  ScanCoord%At1, '-', ScanCoord%At2, '=', Xprimitive_t(I)

!         CASE ('ANGLE')

!            Call vecteur(ScanCoord%At2,ScanCoord%At3,x,y,z,vx1,vy1,vz1,Norm1)

!            Call vecteur(ScanCoord%At2,ScanCoord%At1,x,y,z,vx2,vy2,vz2,Norm2)

!            Xprimitive_t(I) = angle(vx1,vy1,vz1,Norm1,vx2,vy2,vz2,Norm2)*Pi/180.

!            !Print *, I, ':', ScanCoord%At1, '-', ScanCoord%At2,'-',ScanCoord%At3, '=', Xprimitive_t(I)*180./Pi

!         CASE ('DIHEDRAL')

!            Call vecteur(ScanCoord%At2,ScanCoord%At3,x,y,z,vx2,vy2,vz2,Norm2)

!            Call vecteur(ScanCoord%At2,ScanCoord%At1,x,y,z,vx1,vy1,vz1,Norm1)

!            Call vecteur(ScanCoord%At3,ScanCoord%At4,x,y,z,vx3,vy3,vz3,Norm3)

!            Call produit_vect(vx3,vy3,vz3,vx2,vy2,vz2,vx5,vy5,vz5,norm5)

!            Call produit_vect(vx1,vy1,vz1,vx2,vy2,vz2,vx4,vy4,vz4,norm4)

! !!! PFL 28 Feb 2008 Test to be sure that angle does not change by more than Pi

!            !           Xprimitive_t(I)=angle_d(vx4,vy4,vz4,norm4,vx5,vy5,vz5,norm5,vx2,vy2,vz2,norm2)*Pi/180.

!            DiheTmp=angle_d(vx4,vy4,vz4,norm4,vx5,vy5,vz5,norm5,vx2,vy2,vz2,norm2)

!            Xprimitive_t(I) = DiheTmp*Pi/180.

!            ! We treat large dihedral angles differently as +180=-180 mathematically and physically

!            ! but this causes lots of troubles when converting baker to cart.

!            ! So we ensure that large dihedral angles always have the same sign

!            if (abs(ScanCoord%SignDihedral).NE.1) THEN

!               ScanCoord%SignDihedral=Int(Sign(1.d0,DiheTmp))

!            ELSE

!               If ((abs(DiheTmp).GE.170.D0).AND.(Sign(1.,DiheTmp)*ScanCoord%SignDihedral<0)) THEN

!                  Xprimitive_t(I) = DiheTmp*Pi/180.+ ScanCoord%SignDihedral*2.*Pi

!               END IF

!            END IF

!            !Print *, I, ':',  ScanCoord%At1, '-',ScanCoord%At2,'-',ScanCoord%At3,'-',&

!            !ScanCoord%At4,'=',Xprimitive_t(I)*180./Pi

!         END SELECT

!         ScanCoord => ScanCoord%next

!      END DO ! matches DO WHILE (Associated(ScanCoord%next))

     !     if (debug) THEN

     !        WRITE(*,*) "Xprimitive_t"

     !        WRITE(*,'(50(1X,F12.6))') Xprimitive_t

     !     END IF

     IntCoord_k=0.d0

     DO I=1, NPrim

        ! Transpose of UMat is needed below, that is why UMat(I,:).

        IntCoord_k(:)=IntCoord_k(:)+UMat_local(I,:)*Xprimitive_t(I)

     END DO

     if (debug) THEN

        WRITE(*,*) "New Xint (IntCoord_k)"

        WRITE(*,'(50(1X,F12.8))') IntCoord_k

        WRITE(*,*) "Target (IntCoord)"

        WRITE(*,'(50(1X,F12.8))') IntCoord

     END IF

     ! Computing DeltaX_int

     DeltaX_int(:) = IntCoord(:)-IntCoord_k(:)

     ! norm2 of DeltaX_int is being calculated here:

     normDeltaX_int=0.d0

     DO I=1, NCoord

        normDeltaX_int=normDeltaX_int+DeltaX_int(I)*DeltaX_int(I)

     END DO

     normDeltaX_int = sqrt(normDeltaX_int)

          if (debug) THEN

             WRITE(*,*) "New Delta_Xint (deltaX_int)"

             WRITE(*,'(50(1X,F12.6))') DeltaX_int

             WRITE(*,*) "Norm:",normDeltaX_int

          END IF

     !IF (Counter .GE. 400) THEN

     !Print *, 'Counter=', Counter, 'normDeltaX_int=', normDeltaX_int

     !Print *, 'DeltaX_int='

     !WRITE(*,'(50(1X,F8.2))') DeltaX_int

     !END IF

     IF (Mod(Counter,1).EQ.0) THEN

        !WRITE(*,*) Nat

        !WRITE(*,*) 'GeomCart in ConvertBakerInternal_cart'

        DO I=1,Nat

           !  WRITE(*,'(1X,A,I4,3(1X,F12.4))') AtName(I),I,X_Cart_k(1:3,I)

        END DO

     END IF

     !call two_norm(DeltaX_int,normDeltaX_int,3*Nat)

  END DO !matches DO While (normDeltaX_int .GT. 1d-11)

  IF (debug) THEN

  WRITE(*,*) 'GeomCart in ConvertBakerInternal_cart'

  DO I=1,Nat

     WRITE(*,'(1X,A,I4,3(1X,F12.4))') AtName(I),I,X_Cart_k(1:3,I)

  END DO

  END IF

  if (debug) THEN

     WRITE(*,*) "Bmat_bakerT"

     DO J=1,NCoord

        WRITE(*,'(50(1X,F12.6))') BMat_BakerT(:,J)

     END DO

  END IF

  !IF (IOptt .GE. 2) THEN

  !   Print  *, 'Counter=', Counter

  !END IF

  IF (Counter .GE. NbItMax) Then

     Print *, 'Counter GE 500, Stopping, normDeltaX_int=', normDeltaX_int

     STOP

  END IF

     x(:) = X_cart_k(1,:)

     y(:) = X_cart_k(2,:)

     z(:) = X_cart_k(3,:)

!  call CalcRmsd(Nat,x_k,y_k,z_k,x,y,z,MRot,rmsd,.TRUE.,.TRUE.)

  if (debug) WRITE(*,*) "COnverted in ",counter," iterations"

  DEALLOCATE(Geom,DeltaX_int,DeltaX_cart)

  DEALLOCATE(BprimT,BBT,BBT_inv,UMat_tmp)

  DEALLOCATE(X_cart_k)

  DEALLOCATE(GMat,EigVal,EigVec)

  XPrim=Xprimitive_t

  if (debug) WRITE(*,*) '=====ConvertBakerInternal_cart Over====='

END SUBROUTINE ConvertBakerInternal_cart