Actual source code: test15f.F
slepc-3.7.2 2016-07-19
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