Actual source code: ex56.c

  2: static char help[] = "Test the use of MatSetValuesBlocked(), MatZeroRows() for rectangular MatBAIJ matrix, test MatSetValuesBlocked() for MatSBAIJ matrix (-test_mat_sbaij).";

 4:  #include petscmat.h

  8: int main(int argc,char **args)
  9: {
 10:   Mat            A;
 11:   PetscInt       bs=3,m=4,n=6,i,j,val = 10,row[2],col[3],eval,rstart;
 13:   PetscMPIInt    size,rank;
 14:   PetscScalar    x[6][9],y[3][3],one=1.0;
 15:   IS             is;
 16:   PetscTruth     flg,testsbaij=PETSC_FALSE;

 18:   PetscInitialize(&argc,&args,(char *)0,help);

 20:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 21:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);

 23:   PetscOptionsHasName(PETSC_NULL,"-test_mat_sbaij",&testsbaij);
 24: 
 25:   if (testsbaij){
 26:     if (size == 1) {
 27:       MatCreateSeqSBAIJ(PETSC_COMM_SELF,bs,m*bs,n*bs,1,PETSC_NULL,&A);
 28:     } else {
 29:       MatCreateMPISBAIJ(PETSC_COMM_WORLD,bs,m*bs,n*bs,PETSC_DECIDE,PETSC_DECIDE,1,
 30:                             PETSC_NULL,1,PETSC_NULL,&A);
 31:     }
 32:   } else {
 33:     if (size == 1) {
 34:       MatCreateSeqBAIJ(PETSC_COMM_SELF,bs,m*bs,n*bs,1,PETSC_NULL,&A);
 35:     } else {
 36:       MatCreateMPIBAIJ(PETSC_COMM_WORLD,bs,m*bs,n*bs,PETSC_DECIDE,PETSC_DECIDE,1,
 37:                             PETSC_NULL,1,PETSC_NULL,&A);
 38:     }
 39:   }
 40:   PetscOptionsHasName(PETSC_NULL,"-column_oriented",&flg);
 41:   if (flg) {
 42:     MatSetOption(A,MAT_COLUMN_ORIENTED);
 43:     eval = 6;
 44:   } else {
 45:     eval = 9;
 46:   }

 48:   PetscOptionsHasName(PETSC_NULL,"-ass_extern",&flg);
 49:   if (flg && (size != 1))    rstart = m*((rank+1)%size);
 50:   else                       rstart = m*(rank);

 52:   row[0] =rstart+0;  row[1] =rstart+2;
 53:   col[0] =rstart+0;  col[1] =rstart+1;  col[2] =rstart+3;
 54:   for (i=0; i<6; i++) {
 55:     for (j =0; j< 9; j++) x[i][j] = (PetscScalar)val++;
 56:   }

 58:   MatSetValuesBlocked(A,2,row,3,col,&x[0][0],INSERT_VALUES);



 62:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 63:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

 65:   /*
 66:   This option does not work for rectangular matrices
 67:   MatSetOption(A,MAT_NEW_NONZERO_LOCATION_ERR);
 68:   */
 69: 
 70:   MatSetValuesBlocked(A,2,row,3,col,&x[0][0],INSERT_VALUES);

 72:   /* Do another MatSetValues to test the case when only one local block is specified */
 73:   for (i=0; i<3; i++) {
 74:     for (j =0; j<3 ; j++)  y[i][j] = (PetscScalar)(10 + i*eval + j);
 75:   }
 76:   MatSetValuesBlocked(A,1,row,1,col,&y[0][0],INSERT_VALUES);
 77:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 78:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

 80: 
 81:   PetscOptionsHasName(PETSC_NULL,"-zero_rows",&flg);
 82:   if (flg) {
 83:     col[0] = rstart*bs+0;
 84:     col[1] = rstart*bs+1;
 85:     col[2] = rstart*bs+2;
 86:     ISCreateGeneral(MPI_COMM_SELF,3,col,&is);
 87:     MatZeroRows(A,is,&one);
 88:     ISDestroy(is);
 89:   }

 91:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

 93:   MatDestroy(A);
 94:   PetscFinalize();
 95:   return 0;
 96: }