Actual source code: test14f.F

slepc-3.7.2 2016-07-19
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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: !  Description: Simple example to test the EPS Fortran interface.
 21: !
 22: ! ---------------------------------------------------------------------- 
 23: !
 24:       program main
 25:       implicit none

 27: #include <petsc/finclude/petscsys.h>
 28: #include <petsc/finclude/petscvec.h>
 29: #include <petsc/finclude/petscmat.h>
 30: #include <petsc/finclude/petscviewer.h>
 31: #include <slepc/finclude/slepcsys.h>
 32: #include <slepc/finclude/slepceps.h>

 34: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 35: !     Declarations
 36: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 37:       Mat                A,B
 38:       EPS                eps
 39:       ST                 st
 40:       KSP                ksp
 41:       DS                 ds
 42:       PetscReal          cut,tol,tolabs
 43:       PetscScalar        tget,value
 44:       PetscInt           n,i,its,Istart,Iend
 45:       PetscInt           nev,ncv,mpd
 46:       PetscBool          flg
 47:       EPSConvergedReason reason
 48:       EPSType            tname
 49:       EPSExtraction      extr
 50:       EPSBalance         bal
 51:       EPSWhich           which
 52:       EPSConv            conv
 53:       EPSProblemType     ptype
 54:       PetscMPIInt        rank
 55:       PetscErrorCode     ierr
 56:       SlepcConvMonitor   ctx
 57:       PetscViewerAndFormat vf

 59: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 60: !     Beginning of program
 61: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

 63:       call SlepcInitialize(PETSC_NULL_CHARACTER,ierr)
 64:       call MPI_Comm_rank(PETSC_COMM_WORLD,rank,ierr)
 65:       n = 20
 66:       if (rank .eq. 0) then
 67:         write(*,100) n
 68:       endif
 69:  100  format (/'Diagonal Eigenproblem, n =',I3,' (Fortran)')

 71:       call MatCreate(PETSC_COMM_WORLD,A,ierr)
 72:       call MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n,ierr)
 73:       call MatSetFromOptions(A,ierr)
 74:       call MatSetUp(A,ierr)
 75:       call MatGetOwnershipRange(A,Istart,Iend,ierr)
 76:       do i=Istart,Iend-1
 77:         value = i+1
 78:         call MatSetValue(A,i,i,value,INSERT_VALUES,ierr)
 79:       enddo
 80:       call MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY,ierr)
 81:       call MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY,ierr)

 83: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 84: !     Create eigensolver and test interface functions
 85: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

 87:       call EPSCreate(PETSC_COMM_WORLD,eps,ierr)
 88:       call EPSSetOperators(eps,A,PETSC_NULL_OBJECT,ierr)
 89:       call EPSGetOperators(eps,B,PETSC_NULL_OBJECT,ierr)
 90:       call MatView(B,PETSC_NULL_OBJECT,ierr)

 92:       call EPSSetType(eps,EPSKRYLOVSCHUR,ierr)
 93:       call EPSGetType(eps,tname,ierr)
 94:       if (rank .eq. 0) then
 95:         write(*,110) tname
 96:       endif
 97:  110  format (' Type set to ',A)

 99:       call EPSGetProblemType(eps,ptype,ierr)
100:       if (rank .eq. 0) then
101:         write(*,120) ptype
102:       endif
103:  120  format (' Problem type before changing = ',I2)
104:       call EPSSetProblemType(eps,EPS_HEP,ierr)
105:       call EPSGetProblemType(eps,ptype,ierr)
106:       if (rank .eq. 0) then
107:         write(*,130) ptype
108:       endif
109:  130  format (' ... changed to ',I2)
110:       call EPSIsGeneralized(eps,flg,ierr)
111:       if (flg .and. rank .eq. 0) then
112:         write(*,*) 'generalized'
113:       endif
114:       call EPSIsHermitian(eps,flg,ierr)
115:       if (flg .and. rank .eq. 0) then
116:         write(*,*) 'hermitian'
117:       endif
118:       call EPSIsPositive(eps,flg,ierr)
119:       if (flg .and. rank .eq. 0) then
120:         write(*,*) 'positive'
121:       endif

123:       call EPSGetExtraction(eps,extr,ierr)
124:       if (rank .eq. 0) then
125:         write(*,140) extr
126:       endif
127:  140  format (' Extraction before changing = ',I2)
128:       call EPSSetExtraction(eps,EPS_HARMONIC,ierr)
129:       call EPSGetExtraction(eps,extr,ierr)
130:       if (rank .eq. 0) then
131:         write(*,150) extr
132:       endif
133:  150  format (' ... changed to ',I2)

135:       its = 8
136:       cut = 1.0e-6
137:       bal = EPS_BALANCE_ONESIDE
138:       call EPSSetBalance(eps,bal,its,cut,ierr)
139:       call EPSGetBalance(eps,bal,its,cut,ierr)
140:       if (rank .eq. 0) then
141:         write(*,160) bal,its,cut
142:       endif
143:  160  format (' Balance: ',I2,', its=',I2,', cutoff=',F8.6)

145:       tget = 4.8
146:       call EPSSetTarget(eps,tget,ierr)
147:       call EPSGetTarget(eps,tget,ierr)
148:       call EPSSetWhichEigenpairs(eps,EPS_TARGET_MAGNITUDE,ierr)
149:       call EPSGetWhichEigenpairs(eps,which,ierr)
150:       if (rank .eq. 0) then
151:         write(*,170) which,PetscRealPart(tget)
152:       endif
153:  170  format (' Which = ',I2,', target = ',F3.1)

155:       nev = 4
156:       call EPSSetDimensions(eps,nev,PETSC_DEFAULT_INTEGER,              &
157:      &                      PETSC_DEFAULT_INTEGER,ierr)
158:       call EPSGetDimensions(eps,nev,ncv,mpd,ierr)
159:       if (rank .eq. 0) then
160:         write(*,180) nev,ncv,mpd
161:       endif
162:  180  format (' Dimensions: nev=',I2,', ncv=',I2,', mpd=',I2)

164:       tol = 2.2e-4
165:       its = 200
166:       call EPSSetTolerances(eps,tol,its,ierr)
167:       call EPSGetTolerances(eps,tol,its,ierr)
168:       if (rank .eq. 0) then
169:         write(*,190) tol,its
170:       endif
171:  190  format (' Tolerance =',F7.5,', max_its =',I4)

173:       call EPSSetConvergenceTest(eps,EPS_CONV_ABS,ierr)
174:       call EPSGetConvergenceTest(eps,conv,ierr)
175:       if (rank .eq. 0) then
176:         write(*,200) conv
177:       endif
178:  200  format (' Convergence test =',I2)

180:       call PetscViewerAndFormatCreate(PETSC_VIEWER_STDOUT_WORLD,        &
181:      &                   PETSC_VIEWER_DEFAULT,vf,ierr)
182:       call EPSMonitorSet(eps,EPSMONITORFIRST,vf,                        &
183:      &                   PetscViewerAndFormatDestroy,ierr)
184:       call SlepcConvMonitorCreate(PETSC_VIEWER_STDOUT_WORLD,            &
185:      &                   PETSC_VIEWER_DEFAULT,ctx,ierr)
186:       call EPSMonitorSet(eps,EPSMONITORCONVERGED,ctx,                   &
187:      &                   SlepcConvMonitorDestroy,ierr)
188:       call EPSMonitorCancel(eps,ierr)

190:       call EPSGetST(eps,st,ierr) 
191:       call STGetKSP(st,ksp,ierr) 
192:       tol = 1.e-8
193:       tolabs = 1.e-35
194:       call KSPSetTolerances(ksp,tol,tolabs,PETSC_DEFAULT_REAL,          &
195:      &                      PETSC_DEFAULT_INTEGER,ierr)
196:       call STView(st,PETSC_NULL_OBJECT,ierr) 
197:       call EPSGetDS(eps,ds,ierr) 
198:       call DSView(ds,PETSC_NULL_OBJECT,ierr) 

200:       call EPSSetFromOptions(eps,ierr)
201:       call EPSSolve(eps,ierr) 
202:       call EPSGetConvergedReason(eps,reason,ierr)
203:       call EPSGetIterationNumber(eps,its,ierr)
204:       if (rank .eq. 0) then
205:         write(*,210) reason,its
206:       endif
207:  210  format (' Finished - converged reason =',I2,', its=',I4)

209: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
210: !     Display solution and clean up
211: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
212:       call EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_NULL_OBJECT,ierr)
213:       call EPSDestroy(eps,ierr)
214:       call MatDestroy(A,ierr)

216:       call SlepcFinalize(ierr)
217:       end