On Thu, Nov 10, 2016 at 2:57 PM, Salazar De Troya, Miguel <
salazardet...@llnl.gov> wrote:

> Hello
>
> To implement the rigid body modes I need the node coordinates and the dofs
> they are associated with, or vice versa, the dofs and a coordinate they are
> associated with. I can iterate over the nodes to obtain their coordinates
> and to obtain their dofs with DofObject::dof_number(), but this is
> triggering the assertion libmesh_assert (comp < this->n_comp(s,var)). Are
> there tools in libMesh to do this more elegantly or to just avoid that
> error? I think that this way of calculating rigid body modes would be
> restricted to nodal value finite elements. I don’t know how I could do it
> with non-lagrange finite elements, but that is not of my concern.
>

Sounds like some of your nodes don't have any dofs on them. Are you using
P1 elements on a second order mesh?

I suggest you use something like:
for(unsigned int var=0; var<node->n_dofs(sys_number); var++)

David
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