Actual source code: ex58f.F90
1: !
2: !
3: ! This program demonstrates use of MatGetRow() and MatGetRowMaxAbs() from Fortran
4: !
5: program main
6: #include <petsc/finclude/petscmat.h>
7: use petscmat
8: implicit none
10: Mat A
11: PetscErrorCode ierr
12: PetscInt M,N
13: PetscViewer v
14: Vec rowmax
15: PetscBool flg
16: character*(256) f
18: PetscCallA(PetscInitialize(ierr))
20: PetscCallA(PetscOptionsGetString(PETSC_NULL_OPTIONS,PETSC_NULL_CHARACTER,'-f',f,flg,ierr))
21: PetscCallA(PetscViewerBinaryOpen(PETSC_COMM_WORLD,f,FILE_MODE_READ,v,ierr))
23: PetscCallA(MatCreate(PETSC_COMM_WORLD,A,ierr))
24: PetscCallA(MatSetType(A, MATSEQAIJ,ierr))
25: PetscCallA(MatLoad(A,v,ierr))
27: PetscCallA(MatView(A,PETSC_VIEWER_STDOUT_WORLD,ierr))
29: !
30: ! Test MatGetRowMaxAbs()
31: PetscCallA(MatGetSize(A,M,N,ierr))
32: PetscCallA(VecCreate(PETSC_COMM_WORLD,rowmax,ierr))
33: PetscCallA(VecSetSizes(rowmax,M,M,ierr))
34: PetscCallA(VecSetFromOptions(rowmax,ierr))
36: PetscCallA(MatGetRowMaxAbs(A,rowmax,PETSC_NULL_INTEGER,ierr))
37: PetscCallA(VecView(rowmax,PETSC_VIEWER_STDOUT_WORLD,ierr))
39: PetscCallA(MatGetRowMax(A,rowmax,PETSC_NULL_INTEGER,ierr))
40: PetscCallA(VecView(rowmax,PETSC_VIEWER_STDOUT_WORLD,ierr))
42: PetscCallA(MatGetRowMinAbs(A,rowmax,PETSC_NULL_INTEGER,ierr))
43: PetscCallA(VecView(rowmax,PETSC_VIEWER_STDOUT_WORLD,ierr))
45: PetscCallA(MatGetRowMin(A,rowmax,PETSC_NULL_INTEGER,ierr))
46: PetscCallA(VecView(rowmax,PETSC_VIEWER_STDOUT_WORLD,ierr))
48: PetscCallA(MatDestroy(A,ierr))
49: PetscCallA(PetscViewerDestroy(v,ierr))
50: PetscCallA(VecDestroy(rowmax,ierr))
52: PetscCallA(PetscFinalize(ierr))
53: end
55: !/*TEST
56: !
57: ! test:
58: ! args: -f ${DATAFILESPATH}/matrices/tiny
59: ! requires: datafilespath double !complex !defined(PETSC_USE_64BIT_INDICES)
60: !
61: !TEST*/