Actual source code: ex56.c
petsc-3.4.2 2013-07-02

      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:   PetscBool      flg,testsbaij=PETSC_FALSE;

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

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

     22:   PetscOptionsHasName(NULL,"-test_mat_sbaij",&testsbaij);

     24:   if (testsbaij) {
     25:     MatCreateSBAIJ(PETSC_COMM_WORLD,bs,m*bs,n*bs,PETSC_DECIDE,PETSC_DECIDE,1,NULL,1,NULL,&A);
     26:   } else {
     27:     MatCreateBAIJ(PETSC_COMM_WORLD,bs,m*bs,n*bs,PETSC_DECIDE,PETSC_DECIDE,1,NULL,1,NULL,&A);
     28:   }
     29:   MatSetOption(A,MAT_NEW_NONZERO_ALLOCATION_ERR,PETSC_FALSE);
     30:   eval = 9;

     32:   PetscOptionsHasName(NULL,"-ass_extern",&flg);
     33:   if (flg && (size != 1)) rstart = m*((rank+1)%size);
     34:   else rstart = m*(rank);

     36:   row[0] =rstart+0;  row[1] =rstart+2;
     37:   col[0] =rstart+0;  col[1] =rstart+1;  col[2] =rstart+3;
     38:   for (i=0; i<6; i++) {
     39:     for (j =0; j< 9; j++) x[i][j] = (PetscScalar)val++;
     40:   }

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

     46:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
     47:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

     49:   /*
     50:   This option does not work for rectangular matrices
     51:   MatSetOption(A,MAT_NEW_NONZERO_LOCATION_ERR,PETSC_TRUE);
     52:   */

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

     56:   /* Do another MatSetValues to test the case when only one local block is specified */
     57:   for (i=0; i<3; i++) {
     58:     for (j =0; j<3; j++) y[i][j] = (PetscScalar)(10 + i*eval + j);
     59:   }
     60:   MatSetValuesBlocked(A,1,row,1,col,&y[0][0],INSERT_VALUES);
     61:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
     62:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

     65:   PetscOptionsHasName(NULL,"-zero_rows",&flg);
     66:   if (flg) {
     67:     col[0] = rstart*bs+0;
     68:     col[1] = rstart*bs+1;
     69:     col[2] = rstart*bs+2;
     70:     MatZeroRows(A,3,col,one,0,0);
     71:   }

     73:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

     75:   MatDestroy(&A);
     76:   PetscFinalize();
     77:   return 0;
     78: }