FinalFunctional isn't defined

[emmanuel.malherbe]

I'm facing a problem while installing adjoint. It seems that your class "FinalFunctional" in all the tutorials and examples is called "Functional" in the installed python files (in functional.py)
And when I change (in the tutorial) the FinalFunctional into Functional, I get an error:

AttributeError: 'Form' object has no attribute 'terms'

that still occurs in the functional.py file.

I tried to re install it, it doesn't change. Sorry to bother you, but can you tell me if I'm wrong somewhere and what could I do?

Many thanks.

[Patrick Farrell (pefarrell)]

Dear Emmanuel,

Apologies for the confusion: we updated the API, but haven't changed the documentation or made a release to reflect this. I am travelling for a conference now, but I will fix that as soon as I can.

The short answer to your question: If you had

FinalFunctional(whatever)

change it to

Functional(whatever*dt[FINISH_TIME])

where dt comes pre-defined in dolfin_adjoint. If you've redefined dt (to use it as a timestep length, say), create another time measure and use it like

dtm = TimeMeasure()
Functional(whatever*dtm[FINISH_TIME])

Long answer: The syntax works as follows:
  - *dt means "integrate over all time" (analogous to *dx)
 - * dt[0.5] means "evaluate at time=0.5"
 - * dt[FINISH_TIME] means "evaluate at the final time"
 - * dt[a:b] means "integrate over the time interval a to b

The time integration is currently only working for linear in time, but that will be fixed soon. The evaluation at the end of time works fine.

Hope this helps,

Patrick