Introduction
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When you set up a function or modelled variable, you can choose which simulation phase to evaluate it in. It is essential that the correct time of evaluation(s) is chosen to ensure that:
- Correct information is used in the function; and
- It is evaluated on time, so it can be used in the selected location.
Types of Time of Evaluations
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Choosing the Time of Evaluation(s)
A lot of the power , (and confusion, ) when setting up a function is based around when to choose to evaluate a function or modelled variable. One One important note here is that there will most likely be multiple solutions which will work. To To understand where each of the choices fits in within the larger scheme of the model phases please review ......, refer to 3.5.0 Simulation phases.
Functions Time of Evaluation
The key to choosing the time of evaluation for a function is to consider its usage. For example, if a function is used in a Resource Assessment system, then it is ideally evaluated in the Resource Assessment phase.. Likewise, if you are using the function to drive the demand on a time series demand model, then you would want to choose the ordering phase to evaluate the function. In cases where you are using the function at multiple inputs, you may want to evaluate the function at multiple points.
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