### Support for H1 BrokenElement in FunctionSpace

154

views

0

Hi all,

I have a question for the developers.

I'm interested in storing elemental matrices in the form a large sparse block-diagonal matrix.

To this aim, I have tried using the

My question is: Is there a mathematical/implementation reason because of which a

Consider the following code:

I have a question for the developers.

I'm interested in storing elemental matrices in the form a large sparse block-diagonal matrix.

To this aim, I have tried using the

**BrokenElement**class.My question is: Is there a mathematical/implementation reason because of which a

**FunctionSpace**with**BrokenElement**can not be constructed?Consider the following code:

```
import dolfin as dl
mesh = dl.UnitSquareMesh(1,1)
elH1 = dl.FiniteElement("Lagrange", mesh.ufl_cell(), 1)
elH1_b = dl.BrokenElement(elH1)
Vh = dl.FunctionSpace(mesh, elH1_b)
```

The code gives a segmentation fault with error:

```
Calling FFC just-in-time (JIT) compiler, this may take some time.
Cannot handle this element type: BrokenElement(<CG1 on a triangle>)
```

Which FEniCS package is raising the error? Is there a walk-around?

An alternative could be using **DG**. However, do the **DG** spaces differ from their corresponding **CG** version only at the **DofMap** level or also in term of shape functions?

Thanks in advance!

Umberto

Community: FEniCS Project

### 1 Answer

2

Please login to add an answer/comment or follow this question.