Question about batch experiment

[Thibaut Démare]

Hello,

I am wondering about how do to do something with a batch experiment.
In a GUI experiment, I can define an output which will save, step by step, the evolution of a variable into a file (let's say a CSV file).
It is done like this:
experiment exp_save_results type: gui {
    output {
        file name: "my_file_name" type: text data: "" +my_variable;
    }
}

But in a batch experiment, it seems that I can not save the evolution of my variable. I just can save its last value at the end of the simulations.
Am I wrong? If yes, how can I save in different files the evolution of this variable for each different simulation?

Best regards,

Thibaut

[Patrick Taillandier]

Hi,

If you want to save something during the simulation, the only way is to use the save statement inside your model : https://code.google.com/p/gama-platform/wiki/G__Statements#save

For example, you can used it in an global reflex and save every n steps the values of some variables.

To have example of use of the save statement, you can have a look at the models inside the Model Library/Features/Save statement folder.

Cheers,

Patrick

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[Thibaut Démare]

Yes, I knew about this statement, but I wanted to keep away the "saving" part from the reflex of the model. I have some different experiments and I do not always want to save these data.
But OK, I will deal with it.

Thank you for your quick answer :)

Thibaut

[Patrick Taillandier]

Unfortunately, the use of the save statement is the only way. However, you can define in the reflex condition a condition that will depends on the experiment:

global {

     string xp <- "base";

     ...

      reflex save_xp1 when: xp = "xp1" { ...} 

      reflex save_xp2 when: xp = "xp2" {...} 

}

experiment xp1 type: batch ... {

      parameter "xp" var: xp among:["xp1"];

}

experiment xp2 type: batch ... {

      parameter "xp" var: xp among:["xp2"];

}

[Thibaut Démare]

Sorry I am late to answer.
Indeed, I did something like this with a boolean. It works fine :)

Thank you!