Expression from std::vector

Question

Is there a way to create an expression from two std::vector-s consist of the values and coordinates respectively and are generated by an externel numerical solver.

Answer 1

You can implement your own sub-class of dolfin::Expression, and initialise it with your own data (e.g., your two standard vectors). Your subclass of dolfin::Expression should implement the appropriate dolfin::Expression::eval function, which can use data from vectors that you initialise the class with.