Chimie Théorique » Opt'n Path

subroutine CalcBmat_int(natoms, xyzatm, indzmat, dzdc)

  use Io_module

  use Path_module, only : MW,Pi, atome

  IMPLICIT NONE

  integer(KINT), INTENT(IN) :: natoms, indzmat(natoms,5)

  real(KREAL), INTENT(IN)   :: xyzatm(3,natoms)

  real(KREAL), INTENT(OUT)   :: dzdc(3*natoms,3*natoms)

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

!

! This routine computes the derivatives of the internal coordinates

! with respect to the cartesian coordinates.

! This is what is called the B matrix in Baker coordinates :

! B(i,j)=dz_i/dx_j

!

! it uses the same routines as Calc_baker

!

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

!

! Input:

! natoms: number of atoms

! xyzatm(3,natoms): cartesian geometry

! indzmat(natoms,5): index of the Z-matrix definition

! atmass(natoms): mass of the atoms

! atome(natoms): ??

!

! Output:

! dzdc(3*natoms,3*natoms): B matrix

!

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

  INTERFACE

     function valid(string) result (isValid)

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

       logical                  :: isValid

     END function VALID

  END INTERFACE

  LOGICAL :: debug

  INTEGER(KINT) :: i,j,k,iat

  INTEGER(KINT) :: iat1, iat2, iat3, iat4

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

  debug=valid('CalcBmat_int').OR.valid('CalcBMat')

  if (debug) Call Header('Entering CalcBmat_int')

  if (debug) THEN

     WRITE(*,*) 'DBG CALCBMAT_INT Xyzatm '

     DO iat=1,natoms

        write(*,'(1X,I5,3(1X,F15.6))') atome(iat), xyzatm(1:3,iat)

     END DO

     WRITE(*,*) 'DBG CALCBMAT_INT IndZmat'

     DO iat=1,natoms

        write(*,'(6(1X,I5))') iat, indzmat(iat,1:4)

     END DO

  END IF

  dzdc=0.d0

  if (natoms.ge.2) THEN

     iat1=indzmat(2,1)

     iat2=indzmat(2,2)

     Call CONSTRAINTS_BONDLENGTH_DER(Natoms,iat1,iAT2, xyzatm, dzdc(1,4))

   END IF

  if (natoms.ge.3) THEN

     iat1=indzmat(3,1)

     iat2=indzmat(3,2)

     iat3=indzmat(3,3)

     Call CONSTRAINTS_BONDLENGTH_DER(Natoms,iat1,iAT2, xyzatm, dzdc(1,7))

     CALL CONSTRAINTS_BONDANGLE_DER(Natoms,iAt1,iAT2,iAt3, xyzatm, dzdc(1,8))

  END IF

  k=10

  DO I=4, Natoms

     iat1=indzmat(i,1)

     iat2=indzmat(i,2)

     iat3=indzmat(i,3)

     iat4=indzmat(i,4)

     Call CONSTRAINTS_BONDLENGTH_DER(Natoms,iat1,iAT2, xyzatm, dzdc(1,k))

     k=k+1

     CALL CONSTRAINTS_BONDANGLE_DER(Natoms,iAt1,iAT2,iAt3, xyzatm, dzdc(1,k))

     k=k+1

     CALL CONSTRAINTS_TORSION_DER2(Natoms,iat1,iat2,iat3,iat4, xyzatm, dzdc(1,k)) 

     k=k+1

  END DO

  if (debug) THEN

     WRITE(*,*) 'DBG CALCBMAT_INT dzdc '

     k=min(3*natoms,12)

     DO iat=1,natoms

        DO j=1,3

           write(*,'(1X,I5,12(1X,F12.6))') 3*iat-3+j, dzdc(1:k,3*iat-3+j)

        END DO

     END DO

  END IF             

  if (debug) Call Header('CalcBmat_int Over')

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

end subroutine CalcBmat_int