Hello,

I want to make clear about how FreeFEM deal with the variable coefficient while assembling.

Here is an example:

$$ a(u, v) = \int c \nabla u \cdot \nabla v $$

where c = \cos (x) is a given function.

Is there an explicit step to interpolate c to a high order FE function first?

Or it is to apply numerical integral directly, namely c is evaluated at the quadrature points?

Shihua