# Unable to order quadrilateral cell **URL:** \ **Category:** mesh\ **Created:** [August 25, 2019, 6:59pm UTC](https://fenicsproject.discourse.group/t/unable-to-order-quadrilateral-cell/1396 "2019-08-25T18:59:34Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![bhaveshshrimali](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/bhaveshshrimali/32/124_2.png) [@bhaveshshrimali](https://fenicsproject.discourse.group/u/bhaveshshrimali)\ **Post date:** [August 25, 2019, 6:59pm UTC](https://fenicsproject.discourse.group/t/unable-to-order-quadrilateral-cell/1396/1 "2019-08-25T18:59:34Z")
Is the reordering check for `quad` elements completed in `dolfin - 2019.1.0`? The corresponding [issue](https://bitbucket.org/fenics-project/dolfin/issues?title=Quad%2Fhex+meshes+need+ordering+check) is marked as `resolved`. However I seem to get an error trying to import `quad` meshes (and even when trying to manually create one using `MeshEditor`). It is also reported [here](https://bitbucket.org/fenics-project/dolfin/issues?title=Quad%2Fhex+meshes+need+ordering+check) MWE: ```auto from dolfin import * msh = Mesh() f = XDMFFile(MPI.comm_world,'test_quadMesh.xdmf') f.read(msh) ``` Attached is a picture of the sample mesh, if needed. ![trialMesh](https://global.discourse-cdn.com/free1/uploads/fenicsproject1/original/1X/891b517d60f831f50339f3c33731a7ea00c7f099.png) ---
**Author:** ![bhaveshshrimali](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/bhaveshshrimali/32/124_2.png) [@bhaveshshrimali](https://fenicsproject.discourse.group/u/bhaveshshrimali)\ **Post date:** [August 26, 2019, 3:13am UTC](https://fenicsproject.discourse.group/t/unable-to-order-quadrilateral-cell/1396/2 "2019-08-26T03:13:22Z")
Manually creating the mesh using `MeshEditor`: ```auto nodes, cells = return_points_cells(abaqus_fname) num_nodes = nodes.shape[0] num_elems = cells.shape[0] msh = Mesh() e = MeshEditor() e.open(msh,'quadrilateral',2,2) e.init_vertices(num_nodes) e.init_cells(num_elems) for i, nval in enumerate(nodes): e.add_vertex(i,nval) for elem in cells: e.add_cell(elem[0],np.array([elem[1], elem[2], elem[4], elem[3]],int)) e.close(order=False) with XDMFFile(comm,'trialMesh.xdmf') as wf: wf.write(msh) ``` results in the following mesh: ![trialMeshdolfin](https://global.discourse-cdn.com/free1/uploads/fenicsproject1/original/1X/be04b0ca0cdc8b6f3c8e4b0ee47eecd40e7556ff.png) It does not read the complete mesh, however, at least does better than throwing a `ordering` exception. ---
**Author:** ![RemDelaporteMathurin](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/remdelaportemathurin/32/4543_2.png) [@RemDelaporteMathurin](https://fenicsproject.discourse.group/u/RemDelaporteMathurin)\ **Post date:** [November 18, 2019, 12:22pm UTC](https://fenicsproject.discourse.group/t/unable-to-order-quadrilateral-cell/1396/3 "2019-11-18T12:22:28Z")
Hi ! I ran into this as well ! Have you managed to solve that issue ? Thanks ---
**Author:** ![bleyerj](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/bleyerj/32/6020_2.png) [@bleyerj](https://fenicsproject.discourse.group/u/bleyerj)\ **Post date:** [November 18, 2019, 11:02pm UTC](https://fenicsproject.discourse.group/t/unable-to-order-quadrilateral-cell/1396/4 "2019-11-18T23:02:41Z")
Hi, I think this will be (or is already) fixed in the `dolfinx` version. ---
**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\ **Post date:** [November 19, 2019, 8:04am UTC](https://fenicsproject.discourse.group/t/unable-to-order-quadrilateral-cell/1396/5 "2019-11-19T08:04:38Z")
There is a lot of work going on in dolfinx in quads/hexes. The idea there is to permutation the dofmap instead of ordering the mesh. I think that the permuting of quad dog maps will appear in a PR in dolfinx later this week and be merged early next week. ---
**Author:** ![RemDelaporteMathurin](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/remdelaportemathurin/32/4543_2.png) [@RemDelaporteMathurin](https://fenicsproject.discourse.group/u/RemDelaporteMathurin)\ **Post date:** [November 19, 2019, 12:13pm UTC](https://fenicsproject.discourse.group/t/unable-to-order-quadrilateral-cell/1396/6 "2019-11-19T12:13:02Z")
So this won’t be fixed in the current FEniCS ? ---
**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\ **Post date:** [November 19, 2019, 12:14pm UTC](https://fenicsproject.discourse.group/t/unable-to-order-quadrilateral-cell/1396/7 "2019-11-19T12:14:20Z")
I can’t guarantee that it will. Most development of the FEniCS source code is happening in dolfinx (which hopefully will have a stable release during the first quarter of next year). ---
**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\ **Post date:** [November 19, 2019, 3:43pm UTC](https://fenicsproject.discourse.group/t/unable-to-order-quadrilateral-cell/1396/8 "2019-11-19T15:43:39Z")
Pull request for dolfinx is now submitted: [https://github.com/FEniCS/dolfinx/pull/654](https://github.com/FEniCS/dolfinx/pull/654) Some minor things has to be fixed before its merged, and alleviates the ordering issue for quads and hexes for scalar function-spaces. The next step is to work on permutations of vector spaces instead of ordering the mesh. I guess @mscroggs can give more details