![]() The RUN event starts the simulation, the ENTER event models customers entering the carwash, the START event occurs when a car starts service in the washing bay, and the LEAVE event occurs when a car finishes service and leaves a washing bay. Four events are represented by the four vertices, or nodes, in the event graph (the event node shapes are a matter of taste and can be easily changed). This model is represented below.Īn Event Graph for a Single Server Queue, CARWASH.MODĬARWASH.MOD has only two state variables: QUEUE, the number of cars waiting in line, and SERVERs, the number of currently idle washing machines. Open CARWASH.MOD by pressing the File\Open command, pressing Event Graph, and then double-clicking on CARWASH.MOD from the list of previously created models in the dialog box. We will use a previously created model, CARWASH.MOD, to examine the components of a SIGMA model. Pressing the appropriate push buttons on the tool bar will also activate the Create Process mode or the Select or Edit mode. Clicking the right mouse button will cause the mouse to alternate between the Create Process mode and Select or Edit mode. Add information or make changes by clicking on the appropriate box and entering the data from the keyboard. Just double-click on a vertex or edge, and an Edit Edge or Edit Vertex dialog box will appear. This mode is used to add or change information related to specific vertices or edges. If you click your right mouse button, the mouse pointer will change to Select or Edit mode ( ). It is in this mode that the graphical components of a simulation model are created. When a SIGMA session is started, the mouse pointer is normally in Create Process mode ( ). The simulation plot window contains the File, Edit, Options, Window, and Help menus the output window contains the File, Edit, Search, Window, and Help menus. The menu bar for the simulation graph window contains the following menus: File, Edit, Run, Variables, Zoom, Window, and Help. As the various windows are activated, the menu bar changes. In addition, you can create custom toolkits that emulate any discrete event simulation software engine since event graphs are Turing Complete (see sample toolkits).Ī window is activated when the mouse pointer is clicked anywhere on it. The Start Run and End Run tools allow you to start or stop a simulation run the Select or Edit, Create Process, and Create Single Edge tools let you quickly create a model the Single Step tool allows you to watch the simulation as each event is executed and the Run Time Information and Show SIGMA Version tools provide you with additional information. The various push buttons in SIGMA are identified below. There are three regions in the simulation graph window: the model creation area (the region in the center of the window), the menu bar (located along the top of the window), and the toolbar (located along the right side of the window). Windows representing different models may be open at one time. Note: Several SIGMA modeling sessions may run simultaneously thus, several simulation graph Linked to this modeling session are simulation plot windows and output windows. This is the primary window for a SIGMA modeling session. SIGMA automatically loads your last model, but you can easily open another model using the File/Recall menu or File/Open Event Graph Model commands - or double click on a model (*.MOD) file in the Sigma Models folder in My Documents.Ī simulation graph window similar to the one below will appear when a SIGMA session begins. This tutorial gives an overview of the SIGMA interface and how to run a simple carwash example.ĭouble click on the Sigma desktop icon to begin a SIGMA modeling session. This guided tutorial will show you the general components and basic steps of using SIGMA. Further technical details, including building animations, are presented in the support site. SIGMA also does animations and these can be rather fancy, but it is intended to be used as an analytical tool - in addition to, not instead of, your favorite animation software.Īll primary elements of event relationship graph modeling are explained here. Remember as you explore SIGMA that it is designed for powerful analysis, when answers are needed in addition to animations. ![]() As you advance with SIGMA, you will learn how to to use it to create simulation products that can be easily integrated into dynamic spreadsheets or web sites for serious experimentation. In a few minutes you will learn how to build and run fast and flexible simulations of any system of any size and complexity. ![]()
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