2: static char help[] = "Tests MatTranspose()\n\n";

 4:  #include petscmat.h

  8: int main(int argc,char **args)
  9: {
 10:   Mat            C,A;
 11:   PetscScalar    v;
 12:   PetscInt       i,j,m = 4,n = 4,Ii,J,Istart,Iend;
 13:   PetscMPIInt    rank,size;

 16:   PetscInitialize(&argc,&args,(char *)0,help);
 17:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 18:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 19: 
 20:   MatCreateMPIAIJ(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,
 21:          m*n,m*n,5,PETSC_NULL,5,PETSC_NULL,&C);

 23:   /* create the matrix for the five point stencil, YET AGAIN*/
 24:   MatGetOwnershipRange(C,&Istart,&Iend);
 25:   for (Ii=Istart; Ii<Iend; Ii++) {
 26:     v = -1.0; i = Ii/n; j = Ii - i*n;
 27:     if (i>0)   {J = Ii - n; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
 28:     if (i<m-1) {J = Ii + n; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
 29:     if (j>0)   {J = Ii - 1; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
 30:     if (j<n-1) {J = Ii + 1; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
 31:     v = 4.0; MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES);
 32:   }
 33:   MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
 34:   MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
 35:   MatView(C,PETSC_VIEWER_STDOUT_WORLD);

 37:   MatTranspose(C,&A);
 38:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

 40:   MatDestroy(C);
 41:   MatDestroy(A);
 42:   PetscFinalize();
 43:   return 0;
 44: }