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>

  6: int main(int argc,char **args)
  7: {
  8:   Mat            A;
  9:   PetscInt       bs=3,m=4,n=6,i,j,val = 10,row[2],col[3],eval,rstart;
 11:   PetscMPIInt    size,rank;
 12:   PetscScalar    x[6][9],y[3][3],one=1.0;
 13:   PetscBool      flg,testsbaij=PETSC_FALSE;

 15:   PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr;
 16:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 17:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);

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

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

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

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

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



 43:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 44:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

 46:   /*
 47:   This option does not work for rectangular matrices
 48:   MatSetOption(A,MAT_NEW_NONZERO_LOCATION_ERR,PETSC_TRUE);
 49:   */

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

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


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

 70:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

 72:   MatDestroy(&A);
 73:   PetscFinalize();
 74:   return ierr;
 75: }