Can't loop simulations

[pierre-trott]

Hi,

I'm trying to run the simulation multiple times and changing the vehicle model parameters between each iteration.

• I run the simulation on the car model.
• I modify the car model xml file with code
• I re-run the simulation...

The first iteration works but stops after with an generic Windows Error. Could it be that it doesn't like that I am loading a vehicle that is already loaded? Is there a way to unload_vehicle before load_vehicle again on the same xml? If not, do I have to rename the car model xml to something different every iteration.

Thanks

[juanmanzanero]

Hello Pierre,

This is correct. Once a variable (scalar, vector, car, circuit) has been loaded with a name, you cannot override it. New documentation is available. Two things are possibly happening:

• The car being reloaded with the same name gives the error
• The simulation outputs under "run/variable" also are in place and need to be erased before the new simulation. Call fastest_lap.clear_tables_by_prefix("run/") after you finish downloading your variables

The delete_vehicle function is there in the library, but I have forgot to put a python binding for it. I will deliver it in the next release. I give you three options.

First option, in the mean time you can add to fastest_lap.py

def delete_vehicle(vehicle_name):
        vehicle_name = c.c_char_p((vehicle_name).encode('utf-8'))
        c_lib.delete_vehicle(vehicle_name);
        return;

Second option, change the name of the car at every loop iteration (you will never run out of memory, I think...)

Third option, just create one car, and modify the parameters you are interested using

fastest_lap.set_scalar_parameter(vehicle_name,"vehicle/chassis/aerodynamics/cd", new_value)

[pierre-trott]

Perfect, thank you!