1: static char help[] = "Testing MatCreateMPIAIJSumSeqAIJ().\n\n";

  3:  #include <petscmat.h>

  5: int main(int argc,char **argv)
  6: {
  7:   Mat            A,B;
  8:   MatScalar      a[1],alpha;
  9:   PetscMPIInt    size,rank;
 10:   PetscInt       m,n,i,col, prid;

 13:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 14:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 15:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 16:   prid = size;
 17:   PetscOptionsGetInt(NULL,NULL,"-prid",&prid,NULL);

 19:   m    = n = 10*size;
 20:   MatCreate(PETSC_COMM_SELF,&A);
 21:   MatSetSizes(A,PETSC_DETERMINE,PETSC_DETERMINE,m,n);
 22:   MatSetType(A,MATSEQAIJ);
 23:   MatSetUp(A);

 25:   a[0] = rank+1;
 26:   for (i=0; i<m-rank; i++) {
 27:     col  = i+rank;
 28:     MatSetValues(A,1,&i,1,&col,a,INSERT_VALUES);
 29:   }
 30:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 31:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

 33:   if (rank == prid) {
 34:     PetscPrintf(PETSC_COMM_SELF,"[%d] A: \n",rank);
 35:     MatView(A,PETSC_VIEWER_STDOUT_SELF);
 36:   }

 38:   /* Test MatCreateMPIAIJSumSeqAIJ */
 39:   MatCreateMPIAIJSumSeqAIJ(PETSC_COMM_WORLD,A,PETSC_DECIDE,PETSC_DECIDE,MAT_INITIAL_MATRIX,&B);

 41:   /* Test MAT_REUSE_MATRIX */
 42:   alpha = 0.1;
 43:   for (i=0; i<3; i++) {
 44:     MatScale(A,alpha);
 45:     MatCreateMPIAIJSumSeqAIJ(PETSC_COMM_WORLD,A,PETSC_DECIDE,PETSC_DECIDE,MAT_REUSE_MATRIX,&B);
 46:   }
 47:   MatView(B, PETSC_VIEWER_STDOUT_WORLD);
 48:   MatDestroy(&B);
 49:   MatDestroy(&A);
 50:   PetscFinalize();
 51:   return ierr;
 52: }


 55: /*TEST

 57:    test:
 58:       nsize: 3
 59:       filter: grep -v "MPI processes"

 61:    test:
 62:       suffix: 2
 63:       filter: grep -v "MPI processes"

 65: TEST*/