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().\n\n";

 5:  #include petscmat.h

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

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

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

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

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

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

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

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

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

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

111:   PetscFinalize();
112:   return 0;
113: }
114: