1073 triangulation.set_boundary (0);
1075 std::ofstream x(
"x"), y(
"y");
1080 std::cout <<
"Surface mesh has " << triangulation.n_active_cells()
1087 Note that the only essential addition has been the three lines marked with
1088 asterisks. It is worth pointing out one other thing here, though: because we
1089 detach the manifold description from the surface mesh, whenever we use a
1090 mapping
object in the rest of the program, it has no curves boundary
1091 description to go on any more. Rather, it will have to use the implicit,
1093 explicitly assigned a different manifold object. Consequently, whether we use
1095 using a bilinear approximation.
1097 All these drawbacks aside, the resulting pictures are still pretty. The only
1098 other differences to what's in @ref step_38 "step-38" is that we changed the right hand side
1099 to @f$f(\mathbf x)=
\sin x_3@f$ and the boundary values (through the
1100 <code>Solution</code>
class) to @f$u(\mathbf x)|_{\partial\Omega}=
\cos x_3@f$. Of
1101 course, we now non longer know the exact solution, so the computation of the
1102 error at the end of <code>LaplaceBeltrami::run</code> will yield a meaningless
1104 <a name=
"PlainProg"></a>
1105 <h1> The plain program</h1>
1106 @include
"step-38.cc"
void write_gnuplot(const Triangulation< dim, spacedim > &tria, std::ostream &out, const Mapping< dim, spacedim > *mapping=0) const
VectorizedArray< Number > sin(const ::VectorizedArray< Number > &x)
VectorizedArray< Number > cos(const ::VectorizedArray< Number > &x)