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mirror of https://github.com/pfloos/quack synced 2024-11-03 20:53:53 +01:00

ROHF not yet debugged

This commit is contained in:
Pierre-Francois Loos 2023-09-05 17:23:40 +02:00
parent ea1fd8eebe
commit 99cbd0e95d
15 changed files with 391 additions and 52 deletions

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@ -1,5 +1,5 @@
# RHF UHF RMOM UMOM KS
T F F F F
# RHF UHF ROHF RMOM UMOM KS
T F T F F F
# MP2* MP3
F F
# CCD pCCD DCD CCSD CCSD(T)
@ -15,5 +15,5 @@
# G0W0* evGW* qsGW* SRG-qsGW ufG0W0 ufGW
F F F F F F
# G0T0pp* evGTpp* qsGTpp* G0T0eh evGTeh qsGTeh
F F F T F F
F F F F F F
# * unrestricted version available

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@ -1,5 +1,5 @@
# HF: maxSCF thresh DIIS n_diis guess_type ortho_type mix_guess level_shift stability
512 0.0000001 T 5 1 1 F 0.0 F
64 0.0000001 F 5 1 1 F 0.0 F
# MP: reg
F
# CC: maxSCF thresh DIIS n_diis
@ -9,9 +9,9 @@
# GF: maxSCF thresh DIIS n_diis lin eta renorm reg
256 0.00001 T 5 F 0.0 0 F
# GW: maxSCF thresh DIIS n_diis lin eta TDA_W reg
256 0.00001 T 5 F 0.0 F F
256 0.00001 T 5 F 0.001 F F
# GT: maxSCF thresh DIIS n_diis lin eta TDA_T reg
256 0.00001 T 5 F 0.0 F F
256 0.00001 T 5 F 0.001 F F
# ACFDT: AC Kx XBS
F F T
# BSE: phBSE phBSE2 ppBSE dBSE dTDA

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@ -159,6 +159,7 @@ subroutine CC(doCCD,dopCCD,doDCD,doCCSD,doCCSDT,do_drCCD,do_rCCD,do_crCCD,do_lCC
call wall_time(start_CC)
call pCCD(maxSCF,thresh,max_diis,nBas,nC,nO,nV,nR,ERI,ENuc,EHF,epsHF)
call pCCDso(maxSCF,thresh,max_diis,nBas,nC,nO,nV,nR,ERI,ENuc,EHF,epsHF)
call wall_time(end_CC)
t_CC = end_CC - start_CC

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@ -149,7 +149,7 @@ subroutine G0T0eh(doACFDT,exchange_kernel,doXBS,dophBSE,dophBSE2,TDA_T,TDA,dBSE,
end if
call GTeh_plot_self_energy(eta,nBas,nC,nO,nV,nR,nS,eHF,eHF,Om,rhoL,rhoR)
! call GTeh_plot_self_energy(eta,nBas,nC,nO,nV,nR,nS,eHF,eHF,Om,rhoL,rhoR)
! Compute the RPA correlation energy based on the G0T0eh quasiparticle energies

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@ -197,8 +197,8 @@ subroutine G0T0pp(doACFDT,exchange_kernel,doXBS,dophBSE,TDA_T,TDA,dBSE,dTDA,dopp
end if
call GTpp_plot_self_energy(eta,nBas,nC,nO,nV,nR,nOOs,nVVs,nOOt,nVVt,eHF,eGT,Om1s,rho1s,Om2s,rho2s, &
Om1t,rho1t,Om2t,rho2t)
! call GTpp_plot_self_energy(eta,nBas,nC,nO,nV,nR,nOOs,nVVs,nOOt,nVVt,eHF,eGT,Om1s,rho1s,Om2s,rho2s, &
! Om1t,rho1t,Om2t,rho2t)
!----------------------------------------------
! Dump results

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@ -33,7 +33,7 @@ subroutine GTeh_plot_self_energy(eta,nBas,nC,nO,nV,nR,nS,eHF,eGT,Om,rhoL,rhoR)
! Construct grid
nGrid = 1000
nGrid = 5000
allocate(w(nGrid),SigC(nBas,nGrid),Z(nBas,nGrid),S(nBas,nGrid))
! Initialize

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@ -37,7 +37,7 @@ subroutine GTpp_plot_self_energy(eta,nBas,nC,nO,nV,nR,nOOs,nVVs,nOOt,nVVt,eHF,eG
! Construct grid
nGrid = 1000
nGrid = 5000
allocate(w(nGrid),SigC(nBas,nGrid),Z(nBas,nGrid),S(nBas,nGrid))
! Initialize

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@ -140,7 +140,7 @@ subroutine G0W0(doACFDT,exchange_kernel,doXBS,dophBSE,dophBSE2,TDA_W,TDA,dBSE,dT
end if
call GW_plot_self_energy(eta,nBas,nC,nO,nV,nR,nS,eHF,eHF,Om,rho)
! call GW_plot_self_energy(eta,nBas,nC,nO,nV,nR,nS,eHF,eHF,Om,rho)
! Compute the RPA correlation energy

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@ -32,7 +32,7 @@ subroutine GW_plot_self_energy(eta,nBas,nC,nO,nV,nR,nS,eHF,eGW,Om,rho)
! Construct grid
nGrid = 1000
nGrid = 5000
allocate(w(nGrid),SigC(nBas,nGrid),Z(nBas,nGrid),S(nBas,nGrid))
! Initialize

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@ -1,4 +1,4 @@
subroutine HF(doRHF,doUHF,doRMOM,doUMOM,unrestricted,maxSCF,thresh,max_diis,guess_type,mix,level_shift, &
subroutine HF(doRHF,doUHF,doROHF,doRMOM,doUMOM,unrestricted,maxSCF,thresh,max_diis,guess_type,mix,level_shift, &
nNuc,ZNuc,rNuc,ENuc,nBas,nO,S,T,V,Hc,F,ERI,dipole_int,X,EHF,epsHF,cHF,PHF)
! Hartree-Fock module
@ -10,6 +10,7 @@ subroutine HF(doRHF,doUHF,doRMOM,doUMOM,unrestricted,maxSCF,thresh,max_diis,gues
logical,intent(in) :: doRHF
logical,intent(in) :: doUHF
logical,intent(in) :: doROHF
logical,intent(in) :: doRMOM
logical,intent(in) :: doUMOM
@ -87,7 +88,7 @@ subroutine HF(doRHF,doUHF,doRMOM,doUMOM,unrestricted,maxSCF,thresh,max_diis,gues
call wall_time(end_HF)
t_HF = end_HF - start_HF
write(*,'(A65,1X,F9.3,A8)') 'Total wall time for HF = ',t_HF,' seconds'
write(*,'(A65,1X,F9.3,A8)') 'Total wall time for RHF = ',t_HF,' seconds'
write(*,*)
end if
@ -107,7 +108,27 @@ subroutine HF(doRHF,doUHF,doRMOM,doUMOM,unrestricted,maxSCF,thresh,max_diis,gues
call wall_time(end_HF)
t_HF = end_HF - start_HF
write(*,'(A65,1X,F9.3,A8)') 'Total wall time for HF = ',t_HF,' seconds'
write(*,'(A65,1X,F9.3,A8)') 'Total wall time for UHF = ',t_HF,' seconds'
write(*,*)
end if
!------------------------------------------------------------------------
! Compute ROHF energy
!------------------------------------------------------------------------
if(doROHF) then
! Switch on the unrestricted flag
unrestricted = .true.
call wall_time(start_HF)
call ROHF(maxSCF,thresh,max_diis,guess_type,mix,level_shift,nNuc,ZNuc,rNuc,ENuc, &
nBas,nO,S,T,V,Hc,ERI,dipole_int,X,EHF,epsHF,cHF,PHF)
call wall_time(end_HF)
t_HF = end_HF - start_HF
write(*,'(A65,1X,F9.3,A8)') 'Total wall time for ROHF = ',t_HF,' seconds'
write(*,*)
end if

244
src/HF/ROHF.f90 Normal file
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@ -0,0 +1,244 @@
subroutine ROHF(maxSCF,thresh,max_diis,guess_type,mix,level_shift,nNuc,ZNuc,rNuc,ENuc, &
nBas,nO,S,T,V,Hc,ERI,dipole_int,X,EHF,e,c,P)
! Perform unrestricted Hartree-Fock calculation
implicit none
include 'parameters.h'
! Input variables
integer,intent(in) :: maxSCF
integer,intent(in) :: max_diis
integer,intent(in) :: guess_type
logical,intent(in) :: mix
double precision,intent(in) :: level_shift
double precision,intent(in) :: thresh
integer,intent(in) :: nBas
integer,intent(in) :: nNuc
double precision,intent(in) :: ZNuc(nNuc)
double precision,intent(in) :: rNuc(nNuc,ncart)
double precision,intent(in) :: ENuc
integer,intent(in) :: nO(nspin)
double precision,intent(in) :: S(nBas,nBas)
double precision,intent(in) :: T(nBas,nBas)
double precision,intent(in) :: V(nBas,nBas)
double precision,intent(in) :: Hc(nBas,nBas)
double precision,intent(in) :: X(nBas,nBas)
double precision,intent(in) :: ERI(nBas,nBas,nBas,nBas)
double precision,intent(in) :: dipole_int(nBas,nBas,ncart)
! Local variables
integer :: nSCF
integer :: nBasSq
integer :: n_diis
double precision :: conv
double precision :: rcond
double precision :: ET(nspin)
double precision :: EV(nspin)
double precision :: EJ(nsp)
double precision :: Ex(nspin)
double precision :: dipole(ncart)
double precision,allocatable :: cp(:,:)
double precision,allocatable :: J(:,:,:)
double precision,allocatable :: F(:,:,:)
double precision,allocatable :: Fp(:,:)
double precision,allocatable :: Ftot(:,:)
double precision,allocatable :: Ptot(:,:)
double precision,allocatable :: K(:,:,:)
double precision,allocatable :: err(:,:)
double precision,allocatable :: err_diis(:,:)
double precision,allocatable :: F_diis(:,:)
double precision,external :: trace_matrix
integer :: ispin
! Output variables
double precision,intent(out) :: EHF
double precision,intent(out) :: e(nBas)
double precision,intent(out) :: c(nBas,nBas)
double precision,intent(out) :: P(nBas,nBas,nspin)
! Hello world
write(*,*)
write(*,*)'************************************************'
write(*,*)'* Restricted Open-Shell Hartree-Fock *'
write(*,*)'************************************************'
write(*,*)
! Useful stuff
nBasSq = nBas*nBas
! Memory allocation
allocate(J(nBas,nBas,nspin),F(nBas,nBas,nspin),Fp(nBas,nBas),Ftot(nBas,nBas), &
Ptot(nBas,nBas),K(nBas,nBas,nspin),err(nBas,nBas),cp(nBas,nBas), &
err_diis(nBasSq,max_diis),F_diis(nBasSq,max_diis))
! Guess coefficients and demsity matrices
call mo_guess(nBas,guess_type,S,Hc,X,c)
do ispin=1,nspin
P(:,:,ispin) = matmul(c(:,1:nO(ispin)),transpose(c(:,1:nO(ispin))))
end do
! Initialization
n_diis = 0
F_diis(:,:) = 0d0
err_diis(:,:) = 0d0
rcond = 0d0
nSCF = 0
conv = 1d0
!------------------------------------------------------------------------
! Main SCF loop
!------------------------------------------------------------------------
write(*,*)
write(*,*)'----------------------------------------------------------'
write(*,'(1X,A1,1X,A3,1X,A1,1X,A16,1X,A1,1X,A16,1X,A1,1X,A10,1X,A1,1X)') &
'|','#','|','E(ROHF)','|','Ex(ROHF)','|','Conv','|'
write(*,*)'----------------------------------------------------------'
do while(conv > thresh .and. nSCF < maxSCF)
! Increment
nSCF = nSCF + 1
! Build Coulomb repulsion
do ispin=1,nspin
call Coulomb_matrix_AO_basis(nBas,P(:,:,ispin),ERI(:,:,:,:),J(:,:,ispin))
end do
! Compute exchange potential
do ispin=1,nspin
call exchange_matrix_AO_basis(nBas,P(:,:,ispin),ERI(:,:,:,:),K(:,:,ispin))
end do
! Build Fock operator
do ispin=1,nspin
F(:,:,ispin) = Hc(:,:) + J(:,:,ispin) + J(:,:,mod(ispin,2)+1) + K(:,:,ispin)
end do
call ROHF_fock_matrix(nBas,nO(1),nO(2),S,c,F(:,:,1),F(:,:,2),Ftot)
! Check convergence
err(:,:) = matmul(Ftot(:,:),matmul(Ptot(:,:),S(:,:))) - matmul(matmul(S(:,:),Ptot(:,:)),Ftot(:,:))
if(nSCF > 1) conv = maxval(abs(err(:,:)))
! DIIS extrapolation
if(max_diis > 1) then
n_diis = min(n_diis+1,max_diis)
call DIIS_extrapolation(rcond,nBasSq,nBasSq,n_diis,err_diis(:,1:n_diis),F_diis(:,1:n_diis),err,Ftot)
end if
! Level-shifting
if(level_shift > 0d0 .and. Conv > thresh) then
do ispin=1,nspin
call level_shifting(level_shift,nBas,maxval(nO),S,c,Ftot)
end do
end if
! Transform Fock matrix in orthogonal basis
Fp(:,:) = matmul(transpose(X(:,:)),matmul(Ftot(:,:),X(:,:)))
! Diagonalize Fock matrix to get eigenvectors and eigenvalues
cp(:,:) = Ftot(:,:)
call diagonalize_matrix(nBas,cp,e)
! Back-transform eigenvectors in non-orthogonal basis
c(:,:) = matmul(X(:,:),cp(:,:))
! Compute density matrix
do ispin=1,nspin
P(:,:,ispin) = matmul(c(:,1:nO(ispin)),transpose(c(:,1:nO(ispin))))
end do
Ptot(:,:) = P(:,:,1) + P(:,:,2)
!------------------------------------------------------------------------
! Compute ROHF energy
!------------------------------------------------------------------------
! Kinetic energy
do ispin=1,nspin
ET(ispin) = trace_matrix(nBas,matmul(P(:,:,ispin),T(:,:)))
end do
! Potential energy
do ispin=1,nspin
EV(ispin) = trace_matrix(nBas,matmul(P(:,:,ispin),V(:,:)))
end do
! Coulomb energy
EJ(1) = 0.5d0*trace_matrix(nBas,matmul(P(:,:,1),J(:,:,1)))
EJ(2) = trace_matrix(nBas,matmul(P(:,:,1),J(:,:,2)))
EJ(3) = 0.5d0*trace_matrix(nBas,matmul(P(:,:,2),J(:,:,2)))
! Exchange energy
do ispin=1,nspin
Ex(ispin) = 0.5d0*trace_matrix(nBas,matmul(P(:,:,ispin),K(:,:,ispin)))
end do
! Total energy
EHF = sum(ET(:)) + sum(EV(:)) + sum(EJ(:)) + sum(Ex(:))
! Dump results
write(*,'(1X,A1,1X,I3,1X,A1,1X,F16.10,1X,A1,1X,F16.10,1X,A1,1X,F10.6,1X,A1,1X)') &
'|',nSCF,'|',EHF + ENuc,'|',sum(Ex(:)),'|',conv,'|'
end do
write(*,*)'----------------------------------------------------------'
!------------------------------------------------------------------------
! End of SCF loop
!------------------------------------------------------------------------
! Did it actually converge?
if(nSCF == maxSCF) then
write(*,*)
write(*,*)'!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
write(*,*)' Convergence failed '
write(*,*)'!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
write(*,*)
stop
end if
! Compute final UHF energy
! call dipole_moment(nBas,P(:,:,1)+P(:,:,2),nNuc,ZNuc,rNuc,dipole_int,dipole)
! call print_ROHF(nBas,nO,S,e,c,ENuc,ET,EV,EJ,Ex,EHF,dipole)
end subroutine

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@ -0,0 +1,71 @@
subroutine ROHF_fock_matrix(nBas,nOa,nOb,S,c,Fa,Fb,F)
! Construct the ROHF Fock matrix
implicit none
include 'parameters.h'
! Input variables
integer,intent(in) :: nBas
integer,intent(in) :: nOa
integer,intent(in) :: nOb
double precision,intent(in) :: S(nBas,nBas)
double precision,intent(in) :: c(nBas,nBas)
double precision,intent(inout):: Fa(nBas,nBas)
double precision,intent(inout):: Fb(nBas,nBas)
! Local variables
double precision :: aC,bC
double precision :: aO,bO
double precision :: aV,bV
integer :: nC
integer :: nO
integer :: nV
! Output variables
double precision,intent(out) :: F(nBas,nBas)
! Roothan canonicalization parameters
aC = -0.5d0
bC = +1.5d0
aO = +0.5d0
bO = +0.5d0
aV = +1.5d0
bV = -0.5d0
! Number of closed, open, and virtual orbitals
nC = min(nOa,nOb)
nO = abs(nOa - nOb)
nV = nBas - nC - nO
! Block-by-block Fock matrix
call AOtoMO_transform(nBas,c,Fa)
call AOtoMO_transform(nBas,c,Fb)
F(1:nC, 1:nC ) = aC*Fa(1:nC, 1:nC ) + bC*Fb(1:nC, 1:nC )
F(1:nC, nC+1:nC+nO ) = Fb(1:nC, nC+1:nC+nO )
F(1:nC,nO+nC+1:nC+nO+nV) = 0.5d0*Fa(1:nC,nO+nC+1:nC+nO+nV) + 0.5d0*Fb(1:nC,nO+nC+1:nC+nO+nV)
F(nC+1:nO+nC, 1:nC ) = Fb(nC+1:nO+nC, 1:nC )
F(nC+1:nO+nC, nC+1:nC+nO ) = aO*Fa(nC+1:nC+nO, nC+1:nC+nO ) + bO*Fb(nC+1:nO+nC,nC+1:nC+nO)
F(nC+1:nO+nC,nO+nC+1:nC+nO+nV) = Fa(nC+1:nC+nO,nO+nC+1:nC+nO+nV)
F(nO+nC+1:nC+nO+nV, 1:nC ) = 0.5d0*Fa(nO+nC+1:nC+nO+nV, 1:nC ) + 0.5d0*Fb(nO+nC+1:nC+nO+nV, 1:nC )
F(nO+nC+1:nC+nO+nV, nC+1:nC+nO ) = Fa(nO+nC+1:nC+nO+nV, nC+1:nC+nO )
F(nO+nC+1:nC+nO+nV,nO+nC+1:nC+nO+nV) = aV*Fa(nO+nC+1:nC+nO+nV,nO+nC+1:nC+nO+nV) + bV*Fb(nO+nC+1:nC+nO+nV,nO+nC+1:nC+nO+nV)
call MOtoAO_transform(nBas,S,c,F)
call MOtoAO_transform(nBas,S,c,Fa)
call MOtoAO_transform(nBas,S,c,Fb)
end subroutine

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@ -1,5 +1,5 @@
subroutine UHF(maxSCF,thresh,max_diis,guess_type,mix,level_shift,nNuc,ZNuc,rNuc,ENuc, &
nBas,nO,S,T,V,Hc,ERI,dipole_int,X,EUHF,e,c,P)
nBas,nO,S,T,V,Hc,ERI,dipole_int,X,EHF,e,c,P)
! Perform unrestricted Hartree-Fock calculation
@ -57,7 +57,7 @@ subroutine UHF(maxSCF,thresh,max_diis,guess_type,mix,level_shift,nNuc,ZNuc,rNuc,
! Output variables
double precision,intent(out) :: EUHF
double precision,intent(out) :: EHF
double precision,intent(out) :: e(nBas,nspin)
double precision,intent(out) :: c(nBas,nBas,nspin)
double precision,intent(out) :: P(nBas,nBas,nspin)
@ -219,12 +219,12 @@ subroutine UHF(maxSCF,thresh,max_diis,guess_type,mix,level_shift,nNuc,ZNuc,rNuc,
! Total energy
EUHF = sum(ET(:)) + sum(EV(:)) + sum(EJ(:)) + sum(Ex(:))
EHF = sum(ET(:)) + sum(EV(:)) + sum(EJ(:)) + sum(Ex(:))
! Dump results
write(*,'(1X,A1,1X,I3,1X,A1,1X,F16.10,1X,A1,1X,F16.10,1X,A1,1X,F10.6,1X,A1,1X)') &
'|',nSCF,'|',EUHF + ENuc,'|',sum(Ex(:)),'|',conv,'|'
'|',nSCF,'|',EHF + ENuc,'|',sum(Ex(:)),'|',conv,'|'
end do
write(*,*)'----------------------------------------------------------'
@ -249,6 +249,6 @@ subroutine UHF(maxSCF,thresh,max_diis,guess_type,mix,level_shift,nNuc,ZNuc,rNuc,
! Compute final UHF energy
call dipole_moment(nBas,P(:,:,1)+P(:,:,2),nNuc,ZNuc,rNuc,dipole_int,dipole)
call print_UHF(nBas,nO,S,e,c,ENuc,ET,EV,EJ,Ex,EUHF,dipole)
call print_UHF(nBas,nO,S,e,c,ENuc,ET,EV,EJ,Ex,EHF,dipole)
end subroutine

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@ -4,7 +4,7 @@ program QuAcK
include 'parameters.h'
logical :: unrestricted = .false.
logical :: doHF,doRHF,doUHF,doRMOM,doUMOM
logical :: doHF,doRHF,doUHF,doROHF,doRMOM,doUMOM
logical :: dostab
logical :: doKS
logical :: doMP,doMP2,doMP3
@ -123,7 +123,7 @@ program QuAcK
! Method selection !
!------------------!
call read_methods(doRHF,doUHF,doRMOM,doUMOM,doKS, &
call read_methods(doRHF,doUHF,doROHF,doRMOM,doUMOM,doKS, &
doMP2,doMP3, &
doCCD,dopCCD,doDCD,doCCSD,doCCSDT, &
dodrCCD,dorCCD,docrCCD,dolCCD, &
@ -209,12 +209,12 @@ program QuAcK
! Hartree-Fock module !
!---------------------!
doHF = doRHF .or. doUHF .or. doRMOM .or. doUMOM
doHF = doRHF .or. doUHF .or. doROHF .or. doRMOM .or. doUMOM
if(doHF) then
call wall_time(start_HF)
call HF(doRHF,doUHF,doRMOM,doUMOM,unrestricted,maxSCF_HF,thresh_HF,max_diis_HF, &
call HF(doRHF,doUHF,doROHF,doRMOM,doUMOM,unrestricted,maxSCF_HF,thresh_HF,max_diis_HF, &
guess_type,mix,level_shift,nNuc,ZNuc,rNuc,ENuc,nBas,nO,S,T,V,Hc,F_AO, &
ERI_AO,dipole_int_AO,X,EHF,epsHF,cHF,PHF)
call wall_time(end_HF)

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@ -1,4 +1,4 @@
subroutine read_methods(doRHF,doUHF,doRMOM,doUMOM,doKS, &
subroutine read_methods(doRHF,doUHF,doROHF,doRMOM,doUMOM,doKS, &
doMP2,doMP3, &
doCCD,dopCCD,doDCD,doCCSD,doCCSDT, &
do_drCCD,do_rCCD,do_crCCD,do_lCCD, &
@ -17,7 +17,7 @@ subroutine read_methods(doRHF,doUHF,doRMOM,doUMOM,doKS, &
! Input variables
logical,intent(out) :: doRHF,doUHF,doRMOM,doUMOM,doKS
logical,intent(out) :: doRHF,doUHF,doROHF,doRMOM,doUMOM,doKS
logical,intent(out) :: doMP2,doMP3
logical,intent(out) :: doCCD,dopCCD,doDCD,doCCSD,doCCSDT
logical,intent(out) :: do_drCCD,do_rCCD,do_crCCD,do_lCCD
@ -40,17 +40,19 @@ subroutine read_methods(doRHF,doUHF,doRMOM,doUMOM,doKS, &
doRHF = .false.
doUHF = .false.
doROHF = .false.
doRMOM = .false.
doUMOM = .false.
doKS = .false.
read(1,*)
read(1,*) answer1,answer2,answer3,answer4,answer5
read(1,*) answer1,answer2,answer3,answer4,answer5,answer6
if(answer1 == 'T') doRHF = .true.
if(answer2 == 'T') doUHF = .true.
if(answer3 == 'T') doRMOM = .true.
if(answer4 == 'T') doUMOM = .true.
if(answer5 == 'T') doKS = .true.
if(answer3 == 'T') doROHF = .true.
if(answer4 == 'T') doRMOM = .true.
if(answer5 == 'T') doUMOM = .true.
if(answer6 == 'T') doKS = .true.
! Read MPn methods