simulation results. How to handle the first data point?

[Lennart Ochel]

What about the following example?

model Unnamed
  Real a;
equation
  when sample(0, 10) then
    a = 1;
  end when;
end Unnamed;

What should be the simulation result?

1. a = 1 for all data points
2. a = 1 for all data points with an additional data point at time=0 with a = 0

Actually, OpenModelica produces the second case and Dymola the first one…
Any comments?

[Lennart Ochel]

This problem arose, because I like to compare simulation results to Dymola ... . I think we need either to change our results or the result comparing function. Otherwise it is some kind of nasty...

[Lennart Ochel]

I propose we should change our result files to case a, because the result files are actually simulation result files.

[Willi Braun]

I think case b. is better, since the event is in the model equations and this should also be visible in the result file. The first entry in result file is the result of the initialisation.

For the following model case a. should be fine.

model Unnamed
  Real a;
equation
  when initial() then
    a = 1;
  end when;
end Unnamed;