Date: 2017-05-17T08:26:18+00:00

Actual source code: test15f.F
slepc-3.7.4 2017-05-17
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      1: !  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      2: !  SLEPc - Scalable Library for Eigenvalue Problem Computations
      3: !  Copyright (c) 2002-2016, Universitat Politecnica de Valencia, Spain
      4: !
      5: !  This file is part of SLEPc.
      6: !
      7: !  SLEPc is free software: you can redistribute it and/or modify it under  the
      8: !  terms of version 3 of the GNU Lesser General Public License as published by
      9: !  the Free Software Foundation.
     10: !
     11: !  SLEPc  is  distributed in the hope that it will be useful, but WITHOUT  ANY
     12: !  WARRANTY;  without even the implied warranty of MERCHANTABILITY or  FITNESS
     13: !  FOR  A  PARTICULAR PURPOSE. See the GNU Lesser General Public  License  for
     14: !  more details.
     15: !
     16: !  You  should have received a copy of the GNU Lesser General  Public  License
     17: !  along with SLEPc. If not, see <http://www.gnu.org/licenses/>.
     18: !  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     19: !
     20: !  Program usage: mpiexec -n <np> ./test15f [-help] [-n <n>] [all SLEPc options]
     21: !
     22: !  Description: Tests custom monitors from Fortran.
     23: !
     24: !  The command line options are:
     25: !    -n <n>, where <n> = number of grid points = matrix size
     26: !    -my_eps_monitor, activates the custom monitor
     27: !
     28: ! ----------------------------------------------------------------------
     29: !
     30:       program main
     31:       implicit none

     33: #include <petsc/finclude/petscsys.h>
     34: #include <petsc/finclude/petscvec.h>
     35: #include <petsc/finclude/petscmat.h>
     36: #include <slepc/finclude/slepcsys.h>
     37: #include <slepc/finclude/slepceps.h>

     39: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     40: !     Declarations
     41: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     42: !
     43: !  Variables:
     44: !     A     operator matrix
     45: !     eps   eigenproblem solver context

     47:       Mat            A
     48:       EPS            eps
     49:       EPSType        tname
     50:       PetscInt       n, i, Istart, Iend
     51:       PetscInt       nev
     52:       PetscInt       col(3)
     53:       PetscInt       i1,i2,i3
     54:       PetscMPIInt    rank
     55:       PetscErrorCode ierr
     56:       PetscBool      flg
     57:       PetscScalar    value(3)

     59: !  Note: Any user-defined Fortran routines (such as MyEPSMonitor)
     60: !  MUST be declared as external.

     62:       external MyEPSMonitor

     64: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     65: !     Beginning of program
     66: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

     68:       call SlepcInitialize(PETSC_NULL_CHARACTER,ierr)
     69:       call MPI_Comm_rank(PETSC_COMM_WORLD,rank,ierr)
     70:       n = 30
     71:       call PetscOptionsGetInt(PETSC_NULL_OBJECT,PETSC_NULL_CHARACTER,   &
     72:      &                        '-n',n,flg,ierr)

     74:       if (rank .eq. 0) then
     75:         write(*,100) n
     76:       endif
     77:  100  format (/'1-D Laplacian Eigenproblem, n =',I3,' (Fortran)')

     79: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     80: !     Compute the operator matrix that defines the eigensystem, Ax=kx
     81: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

     83:       call MatCreate(PETSC_COMM_WORLD,A,ierr)
     84:       call MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n,ierr)
     85:       call MatSetFromOptions(A,ierr)
     86:       call MatSetUp(A,ierr)

     88:       i1 = 1
     89:       i2 = 2
     90:       i3 = 3
     91:       call MatGetOwnershipRange(A,Istart,Iend,ierr)
     92:       if (Istart .eq. 0) then
     93:         i = 0
     94:         col(1) = 0
     95:         col(2) = 1
     96:         value(1) =  2.0
     97:         value(2) = -1.0
     98:         call MatSetValues(A,i1,i,i2,col,value,INSERT_VALUES,ierr)
     99:         Istart = Istart+1
    100:       endif
    101:       if (Iend .eq. n) then
    102:         i = n-1
    103:         col(1) = n-2
    104:         col(2) = n-1
    105:         value(1) = -1.0
    106:         value(2) =  2.0
    107:         call MatSetValues(A,i1,i,i2,col,value,INSERT_VALUES,ierr)
    108:         Iend = Iend-1
    109:       endif
    110:       value(1) = -1.0
    111:       value(2) =  2.0
    112:       value(3) = -1.0
    113:       do i=Istart,Iend-1
    114:         col(1) = i-1
    115:         col(2) = i
    116:         col(3) = i+1
    117:         call MatSetValues(A,i1,i,i3,col,value,INSERT_VALUES,ierr)
    118:       enddo

    120:       call MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY,ierr)
    121:       call MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY,ierr)

    123: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    124: !     Create the eigensolver and display info
    125: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    127: !     ** Create eigensolver context
    128:       call EPSCreate(PETSC_COMM_WORLD,eps,ierr)

    130: !     ** Set operators. In this case, it is a standard eigenvalue problem
    131:       call EPSSetOperators(eps,A,PETSC_NULL_OBJECT,ierr)
    132:       call EPSSetProblemType(eps,EPS_HEP,ierr)

    134: !     ** Set user-defined monitor
    135:       call PetscOptionsHasName(PETSC_NULL_OBJECT,PETSC_NULL_CHARACTER,  &
    136:      &                        '-my_eps_monitor',flg,ierr)
    137:       if (flg) then
    138:         call EPSMonitorSet(eps,MyEPSMonitor,PETSC_NULL_OBJECT,          &
    139:      &                     PETSC_NULL_FUNCTION,ierr)
    140:       endif

    142: !     ** Set solver parameters at runtime
    143:       call EPSSetFromOptions(eps,ierr)

    145: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    146: !     Solve the eigensystem
    147: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    149:       call EPSSolve(eps,ierr)

    151: !     ** Optional: Get some information from the solver and display it
    152:       call EPSGetType(eps,tname,ierr)
    153:       if (rank .eq. 0) then
    154:         write(*,120) tname
    155:       endif
    156:  120  format (' Solution method: ',A)
    157:       call EPSGetDimensions(eps,nev,PETSC_NULL_INTEGER,                 &
    158:      &                      PETSC_NULL_INTEGER,ierr)
    159:       if (rank .eq. 0) then
    160:         write(*,130) nev
    161:       endif
    162:  130  format (' Number of requested eigenvalues:',I2)

    164: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    165: !     Display solution and clean up
    166: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    168:       call EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_NULL_OBJECT,ierr)
    169:       call EPSDestroy(eps,ierr)
    170:       call MatDestroy(A,ierr)

    172:       call SlepcFinalize(ierr)
    173:       end

    175: ! --------------------------------------------------------------
    176: !
    177: !  MyEPSMonitor - This is a user-defined routine for monitoring
    178: !  the EPS iterative solvers.
    179: !
    180: !  Input Parameters:
    181: !    eps   - eigensolver context
    182: !    its   - iteration number
    183: !    nconv - number of converged eigenpairs
    184: !    eigr  - real part of the eigenvalues
    185: !    eigi  - imaginary part of the eigenvalues
    186: !    errest- relative error estimates for each eigenpair
    187: !    nest  - number of error estimates
    188: !    dummy - optional user-defined monitor context (unused here)
    189: !
    190:       subroutine MyEPSMonitor(eps,its,nconv,eigr,eigi,errest,nest,dummy,&
    191:      &                        ierr)

    193:       implicit none

    195: #include <petsc/finclude/petscsys.h>
    196: #include <petsc/finclude/petscvec.h>
    197: #include <petsc/finclude/petscmat.h>
    198: #include <slepc/finclude/slepcsys.h>
    199: #include <slepc/finclude/slepceps.h>

    201:       EPS            eps
    202:       Vec            x
    203:       PetscErrorCode ierr
    204:       PetscInt       its,nconv,nest,dummy
    205:       PetscScalar    eigr(*),eigi(*)
    206:       PetscReal      re,errest(*)
    207:       PetscMPIInt    rank

    209:       call MPI_Comm_rank(PETSC_COMM_WORLD,rank,ierr)
    210:       if (its .gt. 0 .and. rank .eq. 0) then
    211:         re = PetscRealPart(eigr(nconv+1))
    212:         write(6,140) its,nconv,re,errest(nconv+1)
    213:       endif

    215:  140  format(i3,' EPS nconv=',i2,' first unconverged value (error) ',   &
    216:      &       f6.4,' (',g9.3,')')
    217:       0
    218:       end