Can you please share 1D Poisson code in Fenicsx?
See https://github.com/FEniCS/dolfinx/blob/main/python/demo/demo_poisson.py. It is straightforward to adapt this demo for a 1D mesh, e.g., https://github.com/FEniCS/dolfinx/blob/main/python/dolfinx/mesh.py#L458-L476.
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