fix unmasked connectivity bug

esmf_regrid/experimental/unstructured_regrid.py

@@ -99,9 +99,15 @@ def _as_esmf_info(self):
         nodeCoord = self.node_coords.flatten()
         nodeOwner = np.zeros([num_node])  # regridding currently serial
         elemId = np.arange(1, num_elem + 1)
-        elemType = self.fnc.count(axis=1)
-        # Experiments seem to indicate that ESMF is using 0 indexing here
-        elemConn = self.fnc.compressed() - self.nsi
+        if np.ma.isMaskedArray(self.fnc):
+            elemType = self.fnc.count(axis=1)
+            # Experiments seem to indicate that ESMF is using 0 indexing here
+            elemConn = self.fnc.compressed() - self.nsi
+        else:
+            elemType = self.fnc.shape[1] * np.ones(self.fnc.shape[0])
+            # Experiments seem to indicate that ESMF is using 0 indexing here
+            elemConn = self.fnc.flatten() - self.nsi
+
         elemCoord = self.elem_coords
         result = (
             num_node,

esmf_regrid/tests/unit/experimental/unstructured_regrid/test_MeshInfo.py

@@ -46,6 +46,20 @@ def test_make_mesh():
     assert esmf_mesh_0.__repr__() == esmf_mesh_1.__repr__() == expected_repr
 
 
+def test_connectivity_mask_equivalence():
+    """Test for handling connectivity masks :meth:`~esmf_regrid.esmf_regridder.GridInfo.make_esmf_field`."""
+    coords, nodes, _ = _make_small_mesh_args()
+    coords = coords[:-1]
+    nodes = nodes[:, :-1]
+    unmasked_nodes = nodes.filled()
+    mesh = MeshInfo(coords, unmasked_nodes, 0)
+    esmf_mesh_unmasked = mesh.make_esmf_field()
+
+    mesh = MeshInfo(coords, nodes, 0)
+    esmf_mesh_masked = mesh.make_esmf_field()
+    assert esmf_mesh_unmasked.__repr__() == esmf_mesh_masked.__repr__()
+
+
 def test_regrid_with_mesh():
     """Basic test for regridding with :meth:`~esmf_regrid.esmf_regridder.GridInfo.make_esmf_field`."""
     mesh_args = _make_small_mesh_args()