Evaluating an integral of the solution

[cjham]

Hello,
This is probably a very basic question but I can't see the answer. I'm sorry if I have missed it.
I would like to evaluate an integral of a function of my solution over the domain and print it. How can I do this?
Many thanks,

[colinjcotter]

if your function is called u,

a = assemble(u*dx)

[cjham]

Great, thank you!