Actual source code: ex98.c
petsc-3.12.4 2020-02-04
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      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;
     24:   PetscMPIInt    rank,size;

     26:   PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr;
     27:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
     28:   if (size != 4) SETERRQ(PETSC_COMM_WORLD,1,"Must run with 4 processors");
     29:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);

     31:   PetscMalloc1(5,&ia);
     32:   PetscMalloc1(16,&ja);
     33:   if (!rank) {
     34:     ja[0] = 1; ja[1] = 4; ja[2] = 0; ja[3] = 2; ja[4] = 5; ja[5] = 1; ja[6] = 3; ja[7] = 6;
     35:     ja[8] = 2; ja[9] = 7;
     36:     ia[0] = 0; ia[1] = 2; ia[2] = 5; ia[3] = 8; ia[4] = 10;
     37:   } else if (rank == 1) {
     38:     ja[0] = 0; ja[1] = 5; ja[2] = 8; ja[3] = 1; ja[4] = 4; ja[5] = 6; ja[6] = 9; ja[7] = 2;
     39:     ja[8] = 5; ja[9] = 7; ja[10] = 10; ja[11] = 3; ja[12] = 6; ja[13] = 11;
     40:     ia[0] = 0; ia[1] = 3; ia[2] = 7; ia[3] = 11; ia[4] = 14;
     41:   } else if (rank == 2) {
     42:     ja[0] = 4; ja[1] = 9; ja[2] = 12; ja[3] = 5; ja[4] = 8; ja[5] = 10; ja[6] = 13; ja[7] = 6;
     43:     ja[8] = 9; ja[9] = 11; ja[10] = 14; ja[11] = 7; ja[12] = 10; ja[13] = 15;
     44:     ia[0] = 0; ia[1] = 3; ia[2] = 7; ia[3] = 11; ia[4] = 14;
     45:   } else {
     46:     ja[0] = 8; ja[1] = 13; ja[2] = 9; ja[3] = 12; ja[4] = 14; ja[5] = 10; ja[6] = 13; ja[7] = 15;
     47:     ja[8] = 11; ja[9] = 14;
     48:     ia[0] = 0; ia[1] = 2; ia[2] = 5; ia[3] = 8; ia[4] = 10;
     49:   }

     51:   MatCreate(PETSC_COMM_WORLD,&A);
     52:   MatSetSizes(A,4,4,16,16);
     53:   MatSetType(A,MATMPIAIJ);
     54:   MatMPIAIJSetPreallocationCSR(A,ia,ja,NULL);
     55:   PetscFree(ia);
     56:   PetscFree(ja);
     57:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);
     58:   MatDestroy(&A);
     59:   PetscFinalize();
     60:   return ierr;
     61: }

     63: /*TEST

     65:    test:
     66:       nsize: 4

     68: TEST*/