StartOperator is used to define central parameters for a model graph. If a CallOperator is created is created and the name of another model graph is typed into the FileName attribute, plab will open that model graph and locate its StartOperator. If found, the parameters are extracted and displayed in the CallOperator. By editing these attributes, the user can change the operation of the model graph.
Model graph operators can be either input or output. Input operators may evaluate formulas, while output parameters may only be variables. By using a CallOperator with the file name of the model graph, a recursion can be performed.
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