control_system::ControlErrors Namespace Reference

All control errors that will be used in control systems. More...

Classes
struct	Expansion
	Control error in the 3D CubicScale coordinate map. More...

Detailed Description

All control errors that will be used in control systems.

Details

A control error is a struct that conforms to the control_system::protocols::ControlError protocol. Control errors compute the error between current map parameters and what they are expected to be. See an example of a control error here:

struct ExampleControlError
    : tt::ConformsTo<control_system::protocols::ControlError> {
  void pup(PUP::er& /*p*/) {}
 
  template <typename Metavariables, typename... QueueTags>
  DataVector operator()(const Parallel::GlobalCache<Metavariables>& cache,
                        const double time,
                        const std::string& function_of_time_name,
                        const tuples::TaggedTuple<QueueTags...>& measurements) {
    const auto& functions_of_time =
        Parallel::get<domain::Tags::FunctionsOfTime>(cache);
    const double current_map_value =
        functions_of_time.at(function_of_time_name)->func(time)[0][0];
    const double measured_value = 0.0;
    // Would do something like get<QueueTag>(measurements) here
    (void)measurements;
 
    return {current_map_value - measured_value};
  }
};