Defining Component Equations

The purpose of the equation section is to establish the mathematical relationships among a component’s variables, parameters, inputs, outputs, time and the time derivatives of each of these entities.

Simple Algebraic System

This example shows implementation for a simple algebraic system.

Use Simulation Time in Equations

This example shows how you can access global simulation time from the equation section.

Using Conditional Expressions in Equations

You can specify conditional equations by usingifstatements.

Using Intermediate Terms in Equations

Textbooks often define certain equation terms in separate equations, and then substitute these intermediate equations into the main one.

Using Lookup Tables in Equations

You can use thetablelookupfunction in theequationssection of the Simscape™ file to interpolate input values based on a set of data points in a one-dimensional, two-dimensional, or three-dimensional table.

Programming Run-Time Errors and Warnings

Use theassertconstruct to implement run-time error and warning messages for a custom block.

Initial Equations

Specify additional equations to be executed during model initialization only.

Simscape Functions

Use Simscape functions to reuse expressions in equations and member declarations of multiple components.

Import Symbolic Math Toolbox Equations

Example of using Symbolic Math Toolbox™ software to solve the physical equations, generate code in the format appropriate for the Simscape language equation section, and incorporate the generated code into the equation section of a component file.