1! 2! This program tests MatGetDiagonal() 3! 4 program main 5#include <petsc/finclude/petscmat.h> 6 use petscmat 7 implicit none 8 9 PetscErrorCode ierr 10 PetscInt i,one,twelve 11 Vec v 12 Mat m 13 PetscScalar value 14 15 PetscCallA(PetscInitialize(ierr)) 16 17 twelve = 12 18 PetscCallA(MatCreate(PETSC_COMM_SELF,m,ierr)) 19 PetscCallA(MatSetSizes(m,twelve,twelve,twelve,twelve,ierr)) 20 PetscCallA(MatSetFromOptions(m,ierr)) 21 PetscCallA(MatSetUp(m,ierr)) 22 23 value = 3.0 24 i = 4 25 one = 1 26 PetscCallA(MatSetValues(m,one,[i],one,[i],[value],INSERT_VALUES,ierr)) 27 PetscCallA(MatAssemblyBegin(m,MAT_FINAL_ASSEMBLY,ierr)) 28 PetscCallA(MatAssemblyEnd(m,MAT_FINAL_ASSEMBLY,ierr)) 29 30 PetscCallA(VecCreateSeq(PETSC_COMM_SELF,twelve,v,ierr)) 31 PetscCallA(MatGetDiagonal(m,v,ierr)) 32 PetscCallA(VecView(v,PETSC_VIEWER_STDOUT_WORLD,ierr)) 33 34 PetscCallA(MatDestroy(m,ierr)) 35 PetscCallA(VecDestroy(v,ierr)) 36 PetscCallA(PetscFinalize(ierr)) 37 end 38 39!/*TEST 40! 41! test: 42! 43!TEST*/ 44