Different mesh interpolation TypeError

General
1

Im trying to interpolate one Function between two different meshes. Basically, what I’m doing is (assuming I already have computed T in )

H = FunctionSpace(mesh,('Lagrange',2))
T_int = Function(H)
T_int.interpolate(T, nmm_interpolation_data=create_nonmatching_meshes_interpolation_data( T._V, H))

However, I get the following error:

TypeError: create_nonmatching_meshes_interpolation_data(): incompatible function arguments. The following argument types are supported:
    1. (Vu: dolfinx::fem::FunctionSpace, Vv: dolfinx::fem::FunctionSpace) -> Tuple[List[int], List[int], List[float], List[int]]
    2. (Vu: dolfinx::fem::FunctionSpace, Vv: dolfinx::fem::FunctionSpace, cells: numpy.ndarray[numpy.int32]) -> Tuple[List[int], List[int], List[float], List[int]]

Invoked with: FunctionSpace(Mesh(VectorElement(Basix element (P, triangle, 1, equispaced, unset, False), 2), 5), Basix element (P, triangle, 2, gll_warped, unset, False)), FunctionSpace(Mesh(VectorElement(Basix element (P, triangle, 1, equispaced, unset, False), 2), 6), Basix element (P, triangle, 2, gll_warped, unset, False))

I am using dolfinx 0.6.0, thank you very much

EDIT: if I chage the order of the funcion spaces, i.e. if I call

create_nonmatching_meshes_interpolation_data( H, T._V)

I get exactly the same error

2

See for instance the test: dolfinx/test_function.py at 8d55f950ca427228a96e96d43893b52b5071bf35 · FEniCS/dolfinx · GitHub

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3

Is there a trick to using create_nonmatching_meshes_interpolation_data? I attempt a simplefrom dolfinx.fem import create_nonmatching_meshes_interpolation_data and get the following error:

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
Cell In[7], line 1
----> 1 from dolfinx.fem import create_nonmatching_meshes_interpolation_data

ImportError: cannot import name 'create_nonmatching_meshes_interpolation_data' from 'dolfinx.fem' (/usr/local/anaconda3/envs/fenicsx-env/lib/python3.10/site-packages/dolfinx/fem/__init__.py)
4

What version of DOLFINx do you have installed ?

5

conda version 0.6.0. I’m in the process of updating because I saw here that was an update 11 days ago. Hopefully that’s the problem.

EDIT. Updating didn’t help

6

This functionality was added after the 0.6.0 release.

The 0.6.0 release supports interpolation between meshes, but does not offer the Pre-compute interpolation data step.

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