[Dune] How can I make a 2d integration in a 3d grid?

[Christian Engwer]

Hi Patrick,

> The compilation works. But if I run the code the last line (get the
> integrationElement) causes an error:
> 
> terminate called after throwing an instance of 'Dune::FMatrixError'
> p0_1262:  p4_error: interrupt SIGx: 6

First of all, please catch the Dune Exceptions and print the error
message, often this already tells you a lot about your problem.

All I can tell you, is that you got an exception in an FMatrix
operation. In your code snipplet you don't even have a FMatrix. It is
really hard to help you without further information.

Christian