The structure of 'VectorL2()' in the cpp document

Hi,

In DG methods, we set a quadrilateral mesh like this: In fact, we want to add some vector basis to the vector space V. So it is essential to know how the vector basis is composited in V. I guess it hides in one core documents but cannot find it.


Best,
Di Yang

PS:
For example, like BDM element in a rectangle, one adds two vector basis ( -x**{k+1}, (k+1)*x**k*y ) and ( (k+1)*x*y**k, -y**{k+1} ) to the standard Pk*Pk.
Now, we want to add ( -x**{k+1}, (k+1)*x**k*y ) and ( (k+1)*x*y**k, -y**{k+1} ) to Qk*Qk element-by-element in a quadrilateral mesh. How can we finish it ? I know it is a tricky work.