Is it possible to pass vector parameters using equation_systems.parameters.set

[nuomi68]

Is it possible to pass vector parameters using equation_systems.parameters.set, and if so, how? Are there any examples?
What does the get_solution (std::vector & soln,std::vectorstd::string & names) function do? How does it work? Are there examples?
thank youstore_initial_solution(

[jwpeterson]

Is it possible to pass vector parameters using equation_systems.parameters.set, and if so, how?

I don't think it's possible. If you want to pass more than scalar integer or floating point values to your Assembly routine, you should consider using the System::attach_assemble_object() API instead of System::attach_assemble_function(). The former allows you to define a C++ class with any contents you like, while the latter requires you to store data on EquationSystems object via the set() API and is less flexible. See systems_of_equations_ex6 and ex9 for examples of using System::attach_assemble_object().

What does the get_solution (std::vector & soln,std::vectorstd::string & names) function do?

get_solution() is a way to get just the "elemental" components of the full solution vector, and was used mainly for doing I/O if I recall correctly. This function is deprecated, so you likely won't find it being called anywhere, and should not call it yourself.

  /**
   * Retrieve the solution data for CONSTANT MONOMIALs and/or components of
   * CONSTANT MONOMIAL_VECs. If 'names' is populated, only the variables
   * corresponding to those names will be retrieved. This can be used to
   * filter which variables are retrieved.
   *
   * \deprecated Call the more appropriately-named build_elemental_solution_vector()
   * instead.
   */
  void get_solution (std::vector<Number> & soln,
                     std::vector<std::string> & names) const;

[nuomi68]

Thank you. I will try further！

[roystgnr]

We do have eq_sys.parameters.set<std::vector<dof_id_type> >("charged_elem_id")=charged_elem_ids; in miscellaneous_ex15.C, and a glance at parameters.h says we support vectors-of-vectors and std::map as parameters too. But I do think John's right that using your own assembly object class (or even your own System subclass) is a better alternative here.

[nuomi68]

Thanks for the information, I will try to follow this example！