Working with submodels

Working with submodels

Simile enables you to wrap any part of your model diagram up in a round-cornered box, called a submodel. The submodel concept can be used to address a wide range of modelling needs, including plug-and-play modularity, disaggregation, spatial modelling and individual-based modelling. If you are new to Simile, you are strongly encouraged to read the introduction to the submodel element, so that you are aware of the various uses of submodels in your modelling.

Defining properties

A submodel's properties are set using a dialogue box invoked by double-clicking anywhere within the submodel in select mode, or by using the "Properties" command of the context menu for that submodel.

Operations on submodels

The editing operations in the context menu apply to the components in the submodel for which it was invoked. Also, the following tools are used to perform operations on submodels:

   

Opening a new window for a submodel

   

Saving a submodel

   

Loading a saved model as a submodel

   

Multiple-instance submodels

Multiple-instance submodels are one of Simile's most valuable features, for constructing object-based models. For real-world objects, such as a tree, it is useful to be able to model several particular instances of the object, each acting in the same general way, though differing in their particular attributes.

  • Fixed membership submodels have a specified number of instances
  • Per-record submodels have one instance for each set of data loaded for its parameters.
  • Population (variable membership) submodels offer control over the number of instances using special model elements
  • Special-purpose submodels have many instances, and extra features which assist in modelling particular common phenomena, e.g., spatial grids

Advanced use of submodels

  • Plug-and-play modularity uses submodels to substitute one alternative section of a model for another, or to include a model developed for another purpose or at a different time within a second model.
  • Iterative submodels contain components that are evaluated repeatedly until a finishing condition is met.
  • A submodel may be given a different time step index than its parent, allowing processes in the submodel to be simulated with a shorter or longer time step than those in the parent model.
  • Satellite submodels are used to extract a subset of values from a population submodel according to a given condition.

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