MATLAB SIMEVENTS RELEASE NOTES Guide de l'utilisateur télécharger pdf (Page 68)

3 Create Entities Using Intergeneration Times

3-2

Role of Entities in SimEvents Models

In this section...

“Create Entities in a Model” on page 3-2

“Vary the Interpretation of Entities” on page 3-2

“Data and Entities” on page 3-2

“Introduction to the Time-Based Entity Generator” on page 3-2

Create Entities in a Model

As described in “What Is an Entity?” on page 1-6, entities are discrete items of interest in

a discrete-event simulation. You determine what an entity signifies, based on what you

are modeling.

SimEvents models typically contain at least one source block that generates entities.

Other SimEvents blocks in the model process the entities that the source block generates.

Vary the Interpretation of Entities

A single model can use entities to represent different kinds of items. For example, if you

are modeling a factory that processes two different kinds of parts, then you can

• Use two Time-Based Entity Generator blocks to create the two kinds of parts.

• Use one Time-Based Entity Generator block and subsequently assign an attribute to

indicate what kind of part each entity represents.

Data and Entities

You can optionally attach data to entities. Such data is stored in one or more attributes

of an entity. You define names and numeric values for attributes. For example, if your

entities represent a message that you are transmitting across a communication network,

you might assign data called length that indicates the length of each particular

message. You can read or change the values of attributes during the simulation.

Introduction to the Time-Based Entity Generator

The Time-Based Entity Generator block creates entities. You configure the Time-Based

Entity Generator block to customize aspects such as:

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MATLAB SIMEVENTS RELEASE NOTES Guide de l'utilisateur Page 68