Actual source code: test14f.F

slepc-3.5.0 2014-07-29
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  1: !  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  2: !  SLEPc - Scalable Library for Eigenvalue Problem Computations
  3: !  Copyright (c) 2002-2014, 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 <finclude/petscsys.h>
 28: #include <finclude/petscvec.h>
 29: #include <finclude/petscmat.h>
 30: #include <finclude/slepcsys.h>
 31: #include <finclude/slepceps.h>

 33: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 34: !     Declarations
 35: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 36:       Mat                A,B
 37:       EPS                eps
 38:       ST                 st
 39:       DS                 ds
 40:       PetscReal          cut,tol
 41:       PetscScalar        tget,value
 42:       PetscInt           n,i,its,Istart,Iend
 43:       PetscInt           nev,ncv,mpd
 44:       PetscBool          flg
 45:       EPSConvergedReason reason
 46:       EPSType            tname
 47:       EPSExtraction      extr
 48:       EPSBalance         bal
 49:       EPSWhich           which
 50:       EPSConv            conv
 51:       EPSProblemType     ptype
 52:       PetscMPIInt        rank
 53:       PetscErrorCode     ierr

 55: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 56: !     Beginning of program
 57: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

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

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

 79: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 80: !     Create eigensolver and test interface functions
 81: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

 83:       call EPSCreate(PETSC_COMM_WORLD,eps,ierr)
 84:       call EPSSetOperators(eps,A,PETSC_NULL_OBJECT,ierr)
 85:       call EPSGetOperators(eps,B,PETSC_NULL_OBJECT,ierr)
 86:       call MatView(B,PETSC_NULL_OBJECT,ierr)

 88:       call EPSSetType(eps,EPSKRYLOVSCHUR,ierr)
 89:       call EPSGetType(eps,tname,ierr)
 90:       if (rank .eq. 0) then
 91:         write(*,110) tname
 92:       endif
 93:  110  format (' Type set to ',A)

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

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

131:       its = 8
132:       cut = 1.0d-6
133:       bal = EPS_BALANCE_ONESIDE
134:       call EPSSetBalance(eps,bal,its,cut,ierr)
135:       call EPSGetBalance(eps,bal,its,cut,ierr)
136:       if (rank .eq. 0) then
137:         write(*,160) bal,its,cut
138:       endif
139:  160  format (' Balance: ',I2,', its=',I2,', cutoff=',F8.6)

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

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

160:       tol = 2.2d-4
161:       its = 200
162:       call EPSSetTolerances(eps,tol,its,ierr)
163:       call EPSGetTolerances(eps,tol,its,ierr)
164:       if (rank .eq. 0) then
165:         write(*,190) tol,its
166:       endif
167:  190  format (' Tolerance =',F7.5,', max_its =',I4)

169:       call EPSSetConvergenceTest(eps,EPS_CONV_ABS,ierr)
170:       call EPSGetConvergenceTest(eps,conv,ierr)
171:       if (rank .eq. 0) then
172:         write(*,200) conv
173:       endif
174:  200  format (' Convergence test =',I2)

176:       call EPSMonitorSet(eps,EPSMONITORFIRST,PETSC_NULL_OBJECT,         &
177:      &                   PETSC_NULL_FUNCTION,ierr)
178:       call EPSMonitorCancel(eps,ierr)

180:       call EPSGetST(eps,st,ierr) 
181:       call STView(st,PETSC_NULL_OBJECT,ierr) 
182:       call EPSGetDS(eps,ds,ierr) 
183:       call DSView(ds,PETSC_NULL_OBJECT,ierr) 

185:       call EPSSetFromOptions(eps,ierr)
186:       call EPSSolve(eps,ierr) 
187:       call EPSGetConvergedReason(eps,reason,ierr)
188:       call EPSGetIterationNumber(eps,its,ierr)
189:       if (rank .eq. 0) then
190:         write(*,210) reason,its
191:       endif
192:  210  format (' Finished - converged reason =',I2,', its=',I4)

194: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
195: !     Display solution and clean up
196: ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
197:       call EPSPrintSolution(eps,PETSC_NULL_OBJECT,ierr)
198:       call EPSDestroy(eps,ierr)
199:       call MatDestroy(A,ierr)

201:       call SlepcFinalize(ierr)
202:       end