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>

  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;
 10:   PetscMPIInt    size,rank;
 11:   PetscScalar    x[6][9],y[3][3],one=1.0;
 12:   PetscBool      flg,testsbaij=PETSC_FALSE;

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

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

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

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

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

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

 40:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 41:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

 43:   /*
 44:   This option does not work for rectangular matrices
 45:   MatSetOption(A,MAT_NEW_NONZERO_LOCATION_ERR,PETSC_TRUE);
 46:   */

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

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

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

 66:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

 68:   MatDestroy(&A);
 69:   PetscFinalize();
 70:   return 0;
 71: }

 73: /*TEST

 75:    test:
 76:       filter: grep -v "MPI processes"

 78:    test:
 79:       suffix: 4
 80:       nsize: 3
 81:       args: -ass_extern
 82:       filter: grep -v "MPI processes"

 84:    test:
 85:       suffix: 5
 86:       nsize: 3
 87:       args: -ass_extern -zero_rows
 88:       filter: grep -v "MPI processes"

 90: TEST*/