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: }