2: static char help[] = "Tests MatTranspose(), MatNorm(), MatValid(), and MatAXPY().\n\n";

 4:  #include petscmat.h

  8: int main(int argc,char **argv)
  9: {
 10:   Mat            mat,tmat = 0;
 11:   PetscInt       m = 4,n,i,j;
 13:   PetscMPIInt    size,rank;
 14:   PetscInt       rstart,rend,rect = 0,nd,bs,*diag,*bdlen;
 15:   PetscTruth     flg,isbdiag;
 16:   PetscScalar    v,**diagv;
 17:   PetscReal      normf,normi,norm1;
 18:   MatInfo        info;
 19: 
 20:   PetscInitialize(&argc,&argv,(char*)0,help);
 21:   PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
 22:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 23:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 24:   n = m;
 25:   PetscOptionsHasName(PETSC_NULL,"-rect1",&flg);
 26:   if (flg) {n += 2; rect = 1;}
 27:   PetscOptionsHasName(PETSC_NULL,"-rect2",&flg);
 28:   if (flg) {n -= 2; rect = 1;}

 30:   /* Create and assemble matrix */
 31:   MatCreate(PETSC_COMM_WORLD,&mat);
 32:   MatSetSizes(mat,PETSC_DECIDE,PETSC_DECIDE,m,n);
 33:   MatSetFromOptions(mat);
 34:   MatGetOwnershipRange(mat,&rstart,&rend);
 35:   for (i=rstart; i<rend; i++) {
 36:     for (j=0; j<n; j++) {
 37:       v=10*i+j;
 38:       MatSetValues(mat,1,&i,1,&j,&v,INSERT_VALUES);
 39:     }
 40:   }
 41:   MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY);
 42:   MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY);

 44:   /* Test whether matrix has been corrupted (just to demonstrate this
 45:      routine) not needed in most application codes. */
 46:   MatValid(mat,(PetscTruth*)&flg);
 47:   if (!flg) SETERRQ(1,"Corrupted matrix.");

 49:   /* Print info about original matrix */
 50:   MatGetInfo(mat,MAT_GLOBAL_SUM,&info);
 51:   PetscPrintf(PETSC_COMM_WORLD,"original matrix nonzeros = %D, allocated nonzeros = %D\n",
 52:                     (PetscInt)info.nz_used,(PetscInt)info.nz_allocated);
 53:   MatNorm(mat,NORM_FROBENIUS,&normf);
 54:   MatNorm(mat,NORM_1,&norm1);
 55:   MatNorm(mat,NORM_INFINITY,&normi);
 56:   PetscPrintf(PETSC_COMM_WORLD,"original: Frobenious norm = %G, one norm = %G, infinity norm = %G\n",
 57:                      normf,norm1,normi);
 58:   MatView(mat,PETSC_VIEWER_STDOUT_WORLD);

 60:   PetscTypeCompare((PetscObject)mat,MATSEQBDIAG,&isbdiag);
 61:   if (!isbdiag) {
 62:     PetscTypeCompare((PetscObject)mat,MATMPIBDIAG,&isbdiag);
 63:   }
 64:   if (isbdiag) {
 65:     MatBDiagGetData(mat,&nd,&bs,&diag,&bdlen,&diagv);
 66:     PetscPrintf(PETSC_COMM_WORLD,"original matrix: block diag format: %D diagonals, block size = %D\n",nd,bs);
 67:     for (i=0; i<nd; i++) {
 68:       PetscPrintf(PETSC_COMM_WORLD," diag=%D, bdlength=%D\n",diag[i],bdlen[i]);
 69:     }
 70:   }

 72:   /* Form matrix transpose */
 73:   PetscOptionsHasName(PETSC_NULL,"-in_place",&flg);
 74:   if (!rect && flg) {
 75:     MatTranspose(mat,0);   /* in-place transpose */
 76:     tmat = mat; mat = 0;
 77:   } else {      /* out-of-place transpose */
 78:     MatTranspose(mat,&tmat);
 79:   }

 81:   /* Print info about transpose matrix */
 82:   MatGetInfo(tmat,MAT_GLOBAL_SUM,&info);
 83:   PetscPrintf(PETSC_COMM_WORLD,"transpose matrix nonzeros = %D, allocated nonzeros = %D\n",
 84:                      (PetscInt)info.nz_used,(PetscInt)info.nz_allocated);
 85:   MatNorm(tmat,NORM_FROBENIUS,&normf);
 86:   MatNorm(tmat,NORM_1,&norm1);
 87:   MatNorm(tmat,NORM_INFINITY,&normi);
 88:   PetscPrintf(PETSC_COMM_WORLD,"transpose: Frobenious norm = %G, one norm = %G, infinity norm = %G\n",
 89:                      normf,norm1,normi);
 90:   MatView(tmat,PETSC_VIEWER_STDOUT_WORLD);

 92:   if (isbdiag) {
 93:     MatBDiagGetData(tmat,&nd,&bs,&diag,&bdlen,&diagv);
 94:     PetscPrintf(PETSC_COMM_WORLD,"transpose matrix: block diag format: %D diagonals, block size = %D\n",nd,bs);
 95:     for (i=0; i<nd; i++) {
 96:       PetscPrintf(PETSC_COMM_WORLD," diag=%D, bdlength=%D\n",diag[i],bdlen[i]);
 97:     }
 98:   }

100:   /* Test MatAXPY */
101:   if (mat && !rect) {
102:     PetscScalar alpha = 1.0;
103:     PetscOptionsGetScalar(PETSC_NULL,"-alpha",&alpha,PETSC_NULL);
104:     PetscPrintf(PETSC_COMM_WORLD,"matrix addition:  B = B + alpha * A\n");
105:     MatAXPY(tmat,alpha,mat,DIFFERENT_NONZERO_PATTERN);
106:     MatView(tmat,PETSC_VIEWER_STDOUT_WORLD);
107:   }

109:   /* Free data structures */
110:   MatDestroy(tmat);
111:   if (mat) {MatDestroy(mat);}

113:   PetscFinalize();
114:   return 0;
115: }
116: