Hi, i have a trial function u wich is 2-dimensional. I’d like to apply a rotation to u in the sense of: for example if u=(u_1,u_2), i want Ru=(-u_2,u_1). How do i code this in my variational formulation? How can i define R so i can write something like
B=inner(u,v)+inner(R*u,v)
Thanks!