Actual source code: ex49.c
1: /*$Id: ex49.c,v 1.24 2001/08/07 21:30:08 bsmith Exp $*/
3: static char help[] = "Tests MatTranspose(), MatNorm(), MatValid(), and MatAXPY().nn";
5: #include petscmat.h
7: int main(int argc,char **argv)
8: {
9: Mat mat,tmat = 0;
10: int m = 4,n,i,j,ierr,size,rank;
11: int rstart,rend,rect = 0,nd,bs,*diag,*bdlen;
12: PetscTruth flg,isbdiag;
13: PetscScalar v,**diagv;
14: PetscReal normf,normi,norm1;
15: MatInfo info;
16:
17: PetscInitialize(&argc,&argv,(char*)0,help);
18: PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
19: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
20: MPI_Comm_size(PETSC_COMM_WORLD,&size);
21: n = m;
22: PetscOptionsHasName(PETSC_NULL,"-rect1",&flg);
23: if (flg) {n += 2; rect = 1;}
24: PetscOptionsHasName(PETSC_NULL,"-rect2",&flg);
25: if (flg) {n -= 2; rect = 1;}
27: /* Create and assemble matrix */
28: MatCreate(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,m,n,&mat);
29: MatSetFromOptions(mat);
30: MatGetOwnershipRange(mat,&rstart,&rend);
31: for (i=rstart; i<rend; i++) {
32: for (j=0; j<n; j++) {
33: v=10*i+j;
34: MatSetValues(mat,1,&i,1,&j,&v,INSERT_VALUES);
35: }
36: }
37: MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY);
38: MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY);
40: /* Test whether matrix has been corrupted (just to demonstrate this
41: routine) not needed in most application codes. */
42: MatValid(mat,(PetscTruth*)&flg);
43: if (!flg) SETERRQ(1,"Corrupted matrix.");
45: /* Print info about original matrix */
46: MatGetInfo(mat,MAT_GLOBAL_SUM,&info);
47: PetscPrintf(PETSC_COMM_WORLD,"original matrix nonzeros = %d, allocated nonzeros = %dn",
48: (int)info.nz_used,(int)info.nz_allocated);
49: MatNorm(mat,NORM_FROBENIUS,&normf);
50: MatNorm(mat,NORM_1,&norm1);
51: MatNorm(mat,NORM_INFINITY,&normi);
52: PetscPrintf(PETSC_COMM_WORLD,"original: Frobenious norm = %g, one norm = %g, infinity norm = %gn",
53: normf,norm1,normi);
54: MatView(mat,PETSC_VIEWER_STDOUT_WORLD);
56: PetscTypeCompare((PetscObject)mat,MATSEQBDIAG,&isbdiag);
57: if (!isbdiag) {
58: PetscTypeCompare((PetscObject)mat,MATMPIBDIAG,&isbdiag);
59: }
60: if (isbdiag) {
61: MatBDiagGetData(mat,&nd,&bs,&diag,&bdlen,&diagv);
62: PetscPrintf(PETSC_COMM_WORLD,"original matrix: block diag format: %d diagonals, block size = %dn",nd,bs);
63: for (i=0; i<nd; i++) {
64: PetscPrintf(PETSC_COMM_WORLD," diag=%d, bdlength=%dn",diag[i],bdlen[i]);
65: }
66: }
68: /* Form matrix transpose */
69: PetscOptionsHasName(PETSC_NULL,"-in_place",&flg);
70: if (!rect && flg) {
71: MatTranspose(mat,0); /* in-place transpose */
72: tmat = mat; mat = 0;
73: } else { /* out-of-place transpose */
74: MatTranspose(mat,&tmat);
75: }
77: /* Print info about transpose matrix */
78: MatGetInfo(tmat,MAT_GLOBAL_SUM,&info);
79: PetscPrintf(PETSC_COMM_WORLD,"transpose matrix nonzeros = %d, allocated nonzeros = %dn",
80: (int)info.nz_used,(int)info.nz_allocated);
81: MatNorm(tmat,NORM_FROBENIUS,&normf);
82: MatNorm(tmat,NORM_1,&norm1);
83: MatNorm(tmat,NORM_INFINITY,&normi);
84: PetscPrintf(PETSC_COMM_WORLD,"transpose: Frobenious norm = %g, one norm = %g, infinity norm = %gn",
85: normf,norm1,normi);
86: MatView(tmat,PETSC_VIEWER_STDOUT_WORLD);
88: if (isbdiag) {
89: MatBDiagGetData(tmat,&nd,&bs,&diag,&bdlen,&diagv);
90: PetscPrintf(PETSC_COMM_WORLD,"transpose matrix: block diag format: %d diagonals, block size = %dn",nd,bs);
91: for (i=0; i<nd; i++) {
92: PetscPrintf(PETSC_COMM_WORLD," diag=%d, bdlength=%dn",diag[i],bdlen[i]);
93: }
94: }
96: /* Test MatAXPY */
97: if (mat && !rect) {
98: PetscScalar alpha = 1.0;
99: PetscOptionsGetScalar(PETSC_NULL,"-alpha",&alpha,PETSC_NULL);
100: PetscPrintf(PETSC_COMM_WORLD,"matrix addition: B = B + alpha * An");
101: MatAXPY(&alpha,mat,tmat,DIFFERENT_NONZERO_PATTERN);
102: MatView(tmat,PETSC_VIEWER_STDOUT_WORLD);
103: }
105: /* Free data structures */
106: MatDestroy(tmat);
107: if (mat) {MatDestroy(mat);}
109: PetscFinalize();
110: return 0;
111: }
112: