It seems I had a misunderstanding about int2d
suppose that I have a mixed fespace like
fespace -> [RT0Orth,P1]
I like to have RT0Orth to be defined all over the domain and P1 only inside the coil.
In fact I like to make a matrix like K=[A B; B' C] which
A=(RT0Orth,RT0Orth);
B=(RT0Orth,P1);
C=(P1,P1);