FE_Q

[Oliver Br]

Hello all,

I am new to dealii and I know this is a stupid question, but when I use FE_Q<3,3> fe; the following error occurs:

error: no matching function for call to ‘dealii::FE_Q<3, 3>::FE_Q()’

Can someone help me please?

Oli

[Daniel Arndt]

Oli,

you need to specify a polynomial degree you want to use. If you have a look at step-2 (https://www.dealii.org/current/doxygen/deal.II/step_2.html),

you see that it has a line saying

const FE_Q<2> finite_element(1);

to create a linear finite element.

Best,

Daniel

[Oliver Br]

Hi Daniel,

Thank you for your answer. My question is about step3 in which:

    Triangulation<2>     triangulation;

    FE_Q<2>              fe;

Best,

Oli

[Daniel Arndt]

Oli,

what is your question? Please elaborate and we are happy to help. You might want to have a look at

"Getting started and posting guidelines for new users" at https://groups.google.com/forum/#!topic/dealii/GRZMUTLIm2I.

Best,

Daniel

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[Simon Sticko]

Hi,
Just to elaborate on what Daniel already said, Oliver, note that it is the constructor of the Step3-class that calls the constructor of FE_Q<dim>, that is

Step3::Step3()
  : fe(1)
  , dof_handler(triangulation)
{}

If you miss this call in the Step3-constructor, you will get the error you stated earlier.

Best,
Simon