Actual source code: ex98.c


  2: static char help[] = "Tests MatMPIAIJSetPreallocationCSR()\n\n";

  4: /*T
  5:    Concepts: partitioning
  6:    Processors: 4
  7: T*/

  9: /*
 10:   Include "petscmat.h" so that we can use matrices.  Note that this file
 11:   automatically includes:
 12:      petscsys.h       - base PETSc routines   petscvec.h - vectors
 13:      petscmat.h - matrices
 14:      petscis.h     - index sets
 15:      petscviewer.h - viewers
 16: */
 17: #include <petscmat.h>

 19: int main(int argc,char **args)
 20: {
 21:   Mat            A;
 22:   PetscInt       *ia,*ja;
 23:   PetscMPIInt    rank,size;

 25:   PetscInitialize(&argc,&args,(char*)0,help);
 26:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 28:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);

 30:   PetscMalloc1(5,&ia);
 31:   PetscMalloc1(16,&ja);
 32:   if (rank == 0) {
 33:     ja[0] = 1; ja[1] = 4; ja[2] = 0; ja[3] = 2; ja[4] = 5; ja[5] = 1; ja[6] = 3; ja[7] = 6;
 34:     ja[8] = 2; ja[9] = 7;
 35:     ia[0] = 0; ia[1] = 2; ia[2] = 5; ia[3] = 8; ia[4] = 10;
 36:   } else if (rank == 1) {
 37:     ja[0] = 0; ja[1] = 5; ja[2] = 8; ja[3] = 1; ja[4] = 4; ja[5] = 6; ja[6] = 9; ja[7] = 2;
 38:     ja[8] = 5; ja[9] = 7; ja[10] = 10; ja[11] = 3; ja[12] = 6; ja[13] = 11;
 39:     ia[0] = 0; ia[1] = 3; ia[2] = 7; ia[3] = 11; ia[4] = 14;
 40:   } else if (rank == 2) {
 41:     ja[0] = 4; ja[1] = 9; ja[2] = 12; ja[3] = 5; ja[4] = 8; ja[5] = 10; ja[6] = 13; ja[7] = 6;
 42:     ja[8] = 9; ja[9] = 11; ja[10] = 14; ja[11] = 7; ja[12] = 10; ja[13] = 15;
 43:     ia[0] = 0; ia[1] = 3; ia[2] = 7; ia[3] = 11; ia[4] = 14;
 44:   } else {
 45:     ja[0] = 8; ja[1] = 13; ja[2] = 9; ja[3] = 12; ja[4] = 14; ja[5] = 10; ja[6] = 13; ja[7] = 15;
 46:     ja[8] = 11; ja[9] = 14;
 47:     ia[0] = 0; ia[1] = 2; ia[2] = 5; ia[3] = 8; ia[4] = 10;
 48:   }

 50:   MatCreate(PETSC_COMM_WORLD,&A);
 51:   MatSetSizes(A,4,4,16,16);
 52:   MatSetType(A,MATMPIAIJ);
 53:   MatMPIAIJSetPreallocationCSR(A,ia,ja,NULL);
 54:   PetscFree(ia);
 55:   PetscFree(ja);
 56:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);
 57:   MatDestroy(&A);
 58:   PetscFinalize();
 59:   return 0;
 60: }

 62: /*TEST

 64:    test:
 65:       nsize: 4

 67: TEST*/