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subroutine Egrad(E,Geom,Grad,NCoord,IGeom,IOpt,GeomCart,FOptGeom,GeomOld,GeomCart_old) 

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! This routines calculates the energy E and the gradient Grad of 
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! a molecule with Geometry Geom (may be in internal coordinates), 
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! using for now, either Gaussian or Ext, more general later. 
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use Path_module, only : Nat,AtName,Coord,dzdc,indzmat,Atome,massat, & 
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prog,NCart,XyzGeomF, XyzGeomI, renum, & 
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GeomOld_all,BTransInvF,BTransInv_local,UMatF,UMat_local & 
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, BprimT,ScanCoord, Coordinate,NPrim,BMat_BakerT,BBT,BBT_inv & 
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, OrderInv, XPrimitiveF 
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! IntCoordF(NGeomF,NCoord),GeomOld_all(NGeomF,NCoord) 
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! allocated in Path.f90 
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use Io_module 
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IMPLICIT NONE 
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! Energy (calculated if F300K=.F., else estimated) 
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REAL(KREAL), INTENT (OUT) :: E 
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! NCoord: Number of the degrees of freedom 
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! IGeom: index of the geometry. 
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INTEGER(KINT), INTENT (IN) :: NCoord, IGeom, IOpt 
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! Geometry at which gradient is calculated (cf Factual also): 
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REAL(KREAL), INTENT (INOUT) :: Geom(NCoord) 
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! Gradient calculated at Geom geometry: 
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REAL(KREAL), INTENT (OUT) :: Grad(NCoord) 
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! Cartesian geometry corresponding to (Internal Geometry) Geom: 
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REAL(KREAL), INTENT (OUT) :: GeomCart(Nat,3) 
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!!! Optional, just for geometry optimization with Baker coordinates 
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REAL(KREAL), INTENT (IN), OPTIONAL :: GeomCart_old(Nat,3) 
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REAL(KREAL), INTENT (INOUT), OPTIONAL :: GeomOld(NCoord) 
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! FOptGeom is a flag indicating if we are doing a geom optimization 
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! it can be omitted so that we use a local flag: Flag_Opt_Geom 
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LOGICAL,INTENT (IN), OPTIONAL :: FOptGeom 
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! if FOptGeom is given Flag_Opt_Geom=FOptGeom, else Flag_Opt_Geom=F 
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LOGICAL :: Flag_Opt_Geom 
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! ====================================================================== 
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LOGICAL :: debug 
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REAL(KREAL), ALLOCATABLE :: GradTmp(:) 
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REAL(KREAL), ALLOCATABLE :: GradCart(:) 
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REAL(KREAL), ALLOCATABLE :: x(:), y(:), z(:) 
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REAL(KREAL) :: Pi 
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INTEGER(KINT) :: iat, i, j, IBeg,Idx 
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REAL(KREAL), ALLOCATABLE :: XPrimRef(:), XPrim(:) ! NPrim 
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 
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! 
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!!!!!!!! PFL Debug 
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! 
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 
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REAL(KREAL), ALLOCATABLE :: GeomTmp(:,:) !3,Nat 
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LOGICAL :: FALOBBT,FALOBPrimt,FAloBBTInv 
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LOGICAL :: DebugPFL 
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! ====================================================================== 
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INTERFACE 
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function valid(string) result (isValid) 
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CHARACTER(*), intent(in) :: string 
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logical :: isValid 
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END function VALID 
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END INTERFACE 
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! ====================================================================== 
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Pi=dacos(1.0d0) 
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if (present(FOptGeom)) THEN 
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Flag_Opt_Geom=FOptGeom 
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ELSE 
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Flag_Opt_Geom=.FALSE. 
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END IF 
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debug=valid('EGRAD') 
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debugPFL=valid('bakerPFL') 
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if (debug) Call Header("Entering Egrad") 
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if (debug) Print *, 'EGrad.f90, L73, IOpt=', IOpt, ' Flag_Opt_Geom=',Flag_Opt_Geom 
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Grad=0. 
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E=0. 
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ALLOCATE(GradCart(3*Nat)) 
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ALLOCATE(x(Nat),y(Nat),z(Nat)) 
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ALLOCATE(XPrimRef(NPrim),XPrim(NPrim)) 
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SELECT CASE (COORD) 
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CASE ('ZMAT') 
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! In order to avoid problem with numbering and linear angles/diehedral, we convert the 
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! zmat into cartesian coordinates 
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! A remplacer par Int2Cart :) 
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Call Int2Cart(nat,indzmat,Geom,GeomCart) 
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CASE ('BAKER') 
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XPrimRef=XPrimitiveF(IGeom,:) 
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IF (Flag_Opt_Geom) THEN 
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IF (IOpt .EQ. 1) THEN 
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GeomCart(:,1) = XyzGeomI(IGeom,1,:) 
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GeomCart(:,2) = XyzGeomI(IGeom,2,:) 
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GeomCart(:,3) = XyzGeomI(IGeom,3,:) 
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ELSE 
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if (debug) WRITE(*,*) 'Before Call ConvertBakerInternal_cart; L125, Egrad.f90' 
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if (.NOT.present(GeomOld)) THEN 
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WRITE(*,*) "ERROR: GeomOld not passed as an argument" 
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STOP 
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END IF 
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WRITE(*,*) 'GeomOld=' 
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WRITE(*,'(12(1X,F6.3))') GeomOld 
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WRITE(*,*) 'Geom=' 
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WRITE(*,'(12(1X,F6.3))') Geom 
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if (.NOT.present(GeomCart_Old)) THEN 
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WRITE(*,*) "ERROR: GeomCart_Old not passed as an argument" 
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STOP 
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END IF 
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WRITE(*,*) 'GeomCart_old=' 
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WRITE(*,'(20(1X,F6.3))') GeomCart_old(1:Nat,1:3) 
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Call ConvertBakerInternal_cart(GeomOld,Geom,GeomCart_old(:,1), & 
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GeomCart_old(:,2),GeomCart_old(:,3),x,y,z,XPrim,XPrimRef) 
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GeomCart(:,1) = x(:) 
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GeomCart(:,2) = y(:) 
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GeomCart(:,3) = z(:) 
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END IF 
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ELSE 
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IF (IOpt .EQ. 0) THEN 
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GeomCart(:,1) = XyzGeomF(IGeom,1,:) 
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GeomCart(:,2) = XyzGeomF(IGeom,2,:) 
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GeomCart(:,3) = XyzGeomF(IGeom,3,:) 
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ELSE 
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! IntCoordF(NGeomF,NCoord), XyzGeomF(NGeomF,3,Nat) 
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! Geom has to be converted into x,y,z 
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! GeomOld_all and XyzGeomF are old geometry in internal and cartesian coords resp. 
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DO I=1,NCoord ! these variables are used in ConvertBakerInternal_cart() 
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BTransInv_local(I,:) = BTransInvF(IGeom,I,:) 
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UMat_local(:,I) = UMatF(IGeom,:,I) 
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END DO 
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if (debug) Print *, 'I am before Call ConvertBakerInternal_cart; L160, Egrad.f90' 
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WRITE(*,*) 'GeomOld=' 
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WRITE(*,'(12(1X,F6.3))') GeomOld_all(IGeom,:) 
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WRITE(*,*) 'Geom=' 
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WRITE(*,'(12(1X,F6.3))') Geom 
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WRITE(*,*) 'DBG Egrad L165 GeomCart_old=' 
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DO I=1,Nat 
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WRITE(*,'(3(1X,F12.8))') XyzGeomF(IGeom,:,I) 
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END DO 
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Call ConvertBakerInternal_cart(GeomOld_all(IGeom,:),Geom,XyzGeomF(IGeom,1,:), & 
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XyzGeomF(IGeom,2,:),XyzGeomF(IGeom,3,:),x,y,z,XPrim,XPrimRef) 
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if (debug) Print *, 'I am after Call ConvertBakerInternal_cart; L111, Egrad.f90' 
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DO I=1,NCoord ! these variables are used in ConvertBakerInternal_cart() 
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BTransInvF(IGeom,I,:) = BTransInv_local(I,:) 
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END DO 
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! GeomCart is actually XyzCoord and has INTENT(OUT) in this subroutine. 
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GeomCart(:,1) = x(:) 
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GeomCart(:,2) = y(:) 
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GeomCart(:,3) = z(:) 
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END IF ! matches IF (IOpt .EQ. 0) THEN 
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END IF 
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CASE ('MIXED') 
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! write(*,*) "Coucou 4mixed" 
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Call Mixed2Cart(Nat,indzmat,geom,GeomCart) 
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CASE ('CART') 
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GeomCart=reshape(Geom,(/Nat,3/)) 
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if (debug) THEN 
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WRITE(*,*) "Coord=CART... in egrad" 
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DO Iat=1,Nat 
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WRITE(IOTMP,'(1X,A10,3(1X,F15.8),A)') Trim(AtName(Iat)),Geom(3*Iat2:3*Iat) 
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END DO 
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END IF 
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CASE ('HYBRID') 
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! write(*,*) "Coucou 4hybrid" 
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GeomCart=reshape(Geom,(/Nat,3/)) 
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CASE DEFAULT 
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WRITE (*,*) "Coord=",TRIM(COORD)," not recognized. Stop" 
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STOP 
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END SELECT 
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!WRITE(*,*) Nat 
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!WRITE(*,*) 'GeomCart in Egrad_baker' 
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!DO I=1,Nat 
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! WRITE(*,'(1X,A,3(1X,F12.8))') AtName(I),GeomCart(I,1:3) 
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!END DO 
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SELECT CASE (Prog) 
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CASE ('GAUSSIAN') 
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! we call the Gaussian routine. 
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! it will return the energy and the gradient in cartesian coordinates. 
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! Gradient calculated at GeomCart geometry and stored in GradCart, which has INTENT(OUT) 
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Call egrad_gaussian(E,GeomCart,GradCart) 
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CASE ('MOPAC') 
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! we call the Mopac routine. 
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! it will return the energy and the gradient in cartesian coordinates. 
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! Gradient calculated at GeomCart geometry and stored in GradCart, which has INTENT(OUT) 
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Call egrad_mopac(E,GeomCart,GradCart) 
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CASE ('VASP') 
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Call egrad_vasp(E,Geomcart,GradCart) 
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CASE ('SIESTA') 
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Call egrad_siesta(E,Geomcart,GradCart) 
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CASE ('TURBOMOLE') 
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Call egrad_turbomole(E,Geomcart,GradCart) 
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CASE ('EXT') 
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Call egrad_ext(E,Geomcart,GradCart) 
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CASE ('TEST') 
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Call egrad_test(Nat,E,Geomcart,GradCart) 
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CASE ('TEST2D') 
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Call egrad_test_2D(Nat,E,Geomcart,GradCart) 
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CASE ('CHAMFRE') 
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Call egrad_chamfre(Nat,E,Geomcart,GradCart) 
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CASE ('LEPS') 
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Call egrad_LEPS(Nat,E,Geomcart,GradCart) 
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END SELECT 
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if (debug) THEN 
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WRITE(*,*) 'DBG EGRAD, GradCart read' 
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DO I=1,Nat 
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Iat=I 
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if (renum) Iat=orderInv(I) 
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WRITE(*,'(1X,A10,3(1X,F15.8),A)') Trim(AtName(Iat)),GradCart(3*I2:3*I) 
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END DO 
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END IF 
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! If (PROG=="VASP") STOP 
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! We have the gradient in Cartesian coordinates... which is ok for COORD=Cart, Hybrid 
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! but we have to convert it into Zmat if COORD=Zmat 
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SELECT CASE (COORD) 
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CASE ("ZMAT") 
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ALLOCATE(GradTmp(3*Nat)) 
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if (debug) WRITE(*,*) "DBG EGRAD Calling CalcBMat_int" 
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CALL CalcBMat_int (nat, reshape(GeomCart,(/3,Nat/),ORDER=(/2,1/)), indzmat, dzdc, massat,atome) 
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if (debug) WRITE(*,*) "DBG EGRAD Calling ConvGrad_Cart2Int" 
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CALL ConvGrad_Cart2Int(Nat,dzdc,IndZmat,GradCart,GradTmp) 
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if (debug) WRITE(*,*) "DBG EGRAD Storing Grad" 
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Grad(1)=GradTmp(4) 
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Grad(2)=GradTmp(7) 
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! We might have troubles whith angles that are not in the [0:pi] range because, 
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! when converted to catesian coord, they do appear in the [0:Pi] range to gaussian... 
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! so that the derivative is not good, and a multiplicative factor should be added... 
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! 
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! This in fact should be taken care of in B mat calculation... 
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! 
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IF ((Geom(3).LE.0).OR.(Geom(3).GE.Pi)) THEN 
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Grad(3)=1.0d0*GradTmp(8) 
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ELSE 
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Grad(3)=GradTmp(8) 
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END IF 
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Idx=4 
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DO I=4,Nat 
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Grad(Idx)=GradTmp(3*i2) 
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Grad(Idx+1)=GradTmp(3*i1) 
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Grad(Idx+2)=GradTmp(3*i) 
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Idx=Idx+3 
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END DO 
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DEALLOCATE(GradTmp) 
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CASE ('BAKER') 
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! We have the gradient in Cartesian coordinates... which is ok for COORD=Cart, Hybrid 
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! but we have to convert it into internal coordinates if COORD=Baker 
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!!!!!!!!!!!!!!!!!!!! 
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! 
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! PFL Debug 
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! 
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!!!!!!!!!!!!!!!!!!!! 
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if (debugPFL) THEN 
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WRITE(*,*) "DBG PFL Egrad_Baker... computing dzdc" 
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if (.not.ALLOCATED(indzmat)) THEN 
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ALLOCATE(indzmat(Nat,5)) 
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IndZmat=0 
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Indzmat(1,1)=1 
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IndZmat(2,1)=2 
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IndZmat(2,2)=1 
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IndZmat(3,1)=3 
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IndZmat(3,2)=2 
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IndZmat(3,3)=1 
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IndZmat(4,1)=4 
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IndZmat(4,2)=3 
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IndZmat(4,3)=2 
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IndZmat(4,4)=1 
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END IF 
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IF (.NOT.ALLOCATED(DzDc)) THEN 
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ALLOCATE(DzDc(3,nat,3,Nat)) 
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END IF 
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if (.NOT.Allocated(GeomTmp)) Allocate(GeomTmp(3,Nat)) 
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DO I=1,Nat 
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GeomTmp(1,I)=GeomCart(OrderInv(I),1) 
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GeomTmp(2,I)=GeomCart(OrderInv(i),2) 
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GeomTmp(3,I)=GeomCart(OrderInv(i),3) 
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END DO 
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DzDc=0.d0 
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CALL CalcBMat_int (nat, GeomTmp, indzmat, dzdc, massat,atome) 
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END IF ! if (debugPFL) 
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!!!!!!!!!!!!!!!!!!!!!!!!! 
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! Debugging PFL 
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!!!!!!!!!!!!!!!!!!!!!!!! 
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WRITE(*,*) "BTransInv_local Trans that is used originally" 
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DO J=1,3*Nat 
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WRITE(*,'(50(1X,F12.8))') BTransInv_local(:,J) 
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END DO 
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WRITE(*,*) "Calculating actual values using GeomCart" 
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if (.NOT.Allocated(GeomTmp)) Allocate(GeomTmp(3,Nat)) 
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GeomTmp(1,:)=GeomCart(1:Nat,1) 
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GeomTmp(2,:)=GeomCart(1:Nat,2) 
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GeomTmp(3,:)=GeomCart(1:Nat,3) 
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! Computing B^prim: 
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FAloBBT=.NOT.ALLOCATED(BBT) 
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FAloBBTInv=.NOT.ALLOCATED(BBT_inv) 
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FAloBPrimT=.NOT.ALLOCATED(BprimT) 
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if (FAloBPrimT) ALLOCATE(Bprimt(3*Nat,NPrim)) 
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if (FAloBBT) ALLOCATE(BBt(NCoord,NCoord)) 
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if (FAloBBTInv) ALLOCATE(BBt_inv(NCoord,NCoord)) 
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BprimT=0.d0 
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ScanCoord=>Coordinate 
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I=0 
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DO WHILE (Associated(ScanCoord%next)) 
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I=I+1 
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SELECT CASE (ScanCoord%Type) 
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CASE ('BOND') 
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CALL CONSTRAINTS_BONDLENGTH_DER(Nat,ScanCoord%at1,ScanCoord%AT2,GeomTmp,BprimT(1,I)) 
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CASE ('ANGLE') 
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CALL CONSTRAINTS_BONDANGLE_DER(Nat,ScanCoord%At1,ScanCoord%AT2,ScanCoord%At3,GeomTmp,BprimT(1,I)) 
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CASE ('DIHEDRAL') 
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CALL CONSTRAINTS_TORSION_DER2(Nat,ScanCoord%At1,ScanCoord%AT2,ScanCoord%At3,ScanCoord%At4,GeomTmp,BprimT(1,I)) 
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END SELECT 
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ScanCoord => ScanCoord%next 
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END DO 
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if (debug) THEN 
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WRITE(*,*) "Bprim " 
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DO J=1,3*Nat 
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WRITE(*,'(50(1X,F12.6))') BprimT(J,:) 
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END DO 
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END IF 
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BMat_BakerT = 0.d0 
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DO I=1,NCoord 
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DO J=1,NPrim 
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!BprimT is transpose of B^prim. 
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!B = UMat^T B^prim, B^T = (B^prim)^T UMat 
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BMat_BakerT(:,I)=BMat_BakerT(:,I)+BprimT(:,J)*UMat_local(J,I) 
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END DO 
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END DO 
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BBT = 0.d0 
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DO I=1,NCoord 
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DO J=1,3*Nat ! BBT(:,I) forms BB^T 
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BBT(:,I) = BBT(:,I) + BMat_BakerT(J,:)*BMat_BakerT(J,I) 
356 
END DO 
357 
END DO 
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BBT_inv = 0.d0 
360  
361 
Call GenInv(NCoord,BBT,BBT_inv,NCoord) 
362  
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! ALLOCATE(V(NCoord,NCoord)) 
364 
! tol = 1e10 
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! ! BBT is destroyed by GINVSE 
366 
! Call GINVSE(BBT,NCoord,NCoord,BBT_inv,NCoord,NCoord,NCoord,tol,V,NCoord,FAIL,IOOUT) 
367 
! DEALLOCATE(V) 
368 
! IF(Fail) Then 
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! WRITE (*,*) "Failed in generalized inverse, L220, ConvertBaker...f90" 
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! STOP 
371 
! END IF 
372  
373 
!Print *, 'BBT_inv=' 
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DO J=1,NCoord 
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! WRITE(*,'(50(1X,F10.2))') BBT_inv(:,J) 
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! Print *, BBT_inv(:,J) 
377 
END DO 
378 
!Print *, 'End of BBT_inv' 
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! Calculation of (B^T)^1 = (BB^T)^1B: 
381 
BTransInv_local = 0.d0 
382 
DO I=1,3*Nat 
383 
DO J=1,NCoord 
384 
BTransInv_local(:,I)=BTransInv_local(:,I)+BBT_inv(:,J)*BMat_BakerT(I,J) 
385 
END DO 
386 
END DO 
387  
388 
Print *, 'BMat_BakerT=' 
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DO J=1,3*Nat 
390 
WRITE(*,'(50(1X,F12.8))') BMat_BakerT(:,J) 
391 
END DO 
392  
393 
WRITE(*,*) "BTransInv_local Trans corresponding to GeomCart" 
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DO J=1,3*Nat 
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WRITE(*,'(50(1X,F12.8))') BTransInv_local(:,J) 
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END DO 
397  
398 
if (FAloBPrimT) DEALLOCATE(Bprimt) 
399 
if (FAloBBT) DEALLOCATE(BBt) 
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if (FAloBBTInv) DEALLOCATE(BBt_inv) 
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402 
Grad=0.d0 
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DO I=1, 3*Nat 
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! Here Grad is gradient in Baker coordinates. GradCart(3*Nat) 
405 
Grad(:) = Grad(:) + BTransInv_local(:,I)*GradCart(I) !BTransInv_local = BTransInv in Opt_Geom.f90 
406 
END DO 
407 
!WRITE(*,*) 'In Egrad.f90, L263, Gradient:' 
408 
!WRITE(*,'(12(1X,F8.4))') Grad(1:NCoord) 
409  
410  
411 
CASE ('MIXED') 
412 
ALLOCATE(GradTmp(3*Nat)) 
413 
if (debug) WRITE(*,*) "DBG EGRAD Calling CalcBMat_mixed" 
414 
CALL CalcBMat_mixed (nat, reshape(GeomCart,(/3,Nat/),ORDER=(/2,1/)), indzmat, dzdc, massat,atome) 
415  
416 
if (Debug) THEN 
417 
WRITE(*,*) "DzDc" 
418 
DO I=1,Nat 
419 
DO J=1,3 
420 
WRITE(*,'(50(1X,F12.6))') dzdc(J,I,:,:) 
421 
END DO 
422 
END DO 
423 
END IF 
424 

425  
426 
CALL ConvGrad_Cart2Int(Nat,dzdc,IndZmat,GradCart,GradTmp) 
427 
DO I=1,Nat 
428 
WRITE(*,'(1X,3(1X,F10.5))') GradTmp(3*I2:3*I) 
429 
END DO 
430 
SELECT CASE (NCART) 
431 
CASE (1) 
432 
Grad(1:3)=GradTmp(1:3) 
433 
Grad(4)=GradTmp(4) 
434 
Grad(5)=GradTmp(7) 
435 
Grad(6)=GradTmp(8) 
436 
Idx=7 
437 
IBeg=4 
438 
CASE(2) 
439 
Grad(1:3)=GradTmp(1:3) 
440 
Grad(4:6)=GradTmp(4:6) 
441 
Grad(7)=GradTmp(7) 
442 
Grad(8)=GradTmp(8) 
443 
Idx=9 
444 
IBeg=4 
445 
CASE DEFAULT 
446 
Idx=1 
447 
IBeg=1 
448 
END SELECT 
449 
DO I=IBeg,Nat 
450 
Grad(Idx)=GradTmp(3*i2) 
451 
Grad(Idx+1)=GradTmp(3*i1) 
452 
Grad(Idx+2)=GradTmp(3*i) 
453 
Idx=Idx+3 
454 
END DO 
455 
DEALLOCATE(GradTmp) 
456 
CASE ("CART","HYBRID") 
457 
Grad=GradCart 
458 
CASE DEFAULT 
459 
WRITE(*,*) "Coord=",AdjustL(Trim(COORD))," not yet implemented in Egradients. STOP" 
460 
STOP 
461 
END SELECT 
462  
463 
DEALLOCATE(GradCart) 
464 
DEALLOCATE(x,y,z) 
465  
466 
IF (Debug) WRITE(*,*) 'DBG EGRAD grad',grad(1:NCoord) 
467 
if (debug) Call Header("Egrad Over") 
468  
469 
!999 CONTINUE 
470 
!if (.NOT.Ftmp) WRITE(*,*) 'We should not be here !!!!' 
471 
!STOP 
472 
! ====================================================================== 
473 
end subroutine Egrad 
474 