Saving multiple functions in one file to visualize it

I/O
2

I’d like to visualize multiple functions using a single xdmf file

Try

with XDMFFile(MPI.comm_world, 'filename.xdmf') as file:
    file.parameters.update(
    {
        "functions_share_mesh": True,
        "rewrite_function_mesh": False
    })
    file.write(u, 0.)
    file.write(rho, 0.)
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