After clicking 'Simulate' on a new model, the following warning appeared:

[:0:0-0:0] Warning: The initial conditions are not fully specified. Use +d=initialization for more information.

I would like to know exactly how I might '[use] +d=initialization for more information.'  Presumably I need to type this somewhere, but where?

I would also like to know how to specify fully the initial conditions for the model (the code for which is posted below, which I copied from a video tutorial here https://www.youtube.com/watch?v=fHA0U8l … r_embedded) so as to avoid receiving this warning:

model Pendulum

 

  parameter Real M = 1;

  // Mass of pendulum

  parameter Real L = 1;

  // Length of pendulum

  parameter Real g = 9.81;

  // Acceleration of gravity

  Real u;

  // Input torque

  Real y;

  // Output angular displacement

  Real x1(start = 1);

  // Pendulum angular displacement

  Real x2(start = 0);

  // Pendulum angular velocity

equation

  der(x1) = x2;

  der(x2) = (u - M * g * L * sin(x1)) / (M * L ^ 2);

  y = x1;

  u = 0;

  

end Pendulum;