How to define a spring boundary condition on euler bernoulli beam theory?

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2

The actually relevant error probably is

Traceback (most recent call last):
  File "/tmp/a.py", line 58, in <module>
    dof=locate_dofs_topological(W,0,startpt)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "lib/python3.11/site-packages/dolfinx/fem/bcs.py", line 87, in locate_dofs_topological
    return _cpp.fem.locate_dofs_topological(V._cpp_object, entity_dim, _entities, remote)  # type: ignore
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: Entity-to-cell connectivity has not been computed.

That error you get can be fixed by adding a domain.topology.create_connectivity(0, domain.topology.dim) before the final for loop.

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