Arrays

Some problems require multi-dimensional data. Alike some other traditional system dynamics tools, AnyLogic supports arrays. Array is a storage of numbers that may have any number of dimensions. Each dimension has finite number of indexes - subscripts. 

Arrays are used when it is necessary to store a large set of coefficients and access them or when there are multiple model layers. The latter case is useful when you have defined a model for some subsystem and there are other subsystems, which have the same structure, as the first one, but other numerical parameters. One can implement such multi-dimensional models making copies of the default diagram and changing the parameters. Such approach has one great disadvantage: if you want to change the model, you need do it so much times, as many layers you have; the diagram grows and becomes incomprehensive. Array allows you to create a single diagram for all the layers. Therefore, model remains compact, and changes you make will affect the whole model, but not a single layer.

For example, you create a model of a nation’s health, describing some social or health processes in respect to different groups of population. You may need to separate people by three characteristics: gender, age group, and social group. This example fits well in the array concept. Instead of dealing with multiple models describing different groups of people, you can just define an array with such enumerations: Gender(male, female), Age(child, teenager, adult, aged), and SocialGroup(wealthy, middleclass, deprived).  

The following variables can be made arrays in AnyLogic:

Demo model: Bass Diffusion Arrays



Related topics

 Dimensions

 Defining an array variable

 Initializing an array variable

 Defining equations for array variables

           API Reference: HyperArray Class