When to Use an S-Function :: Overview of S-Functions (Writing S-Functions)

Writing S-Functions

When to Use an S-Function

The most common use of S-functions is to create custom Simulink blocks. You can use S-functions for a variety of applications, including

Adding new general purpose blocks to Simulink

Adding blocks that represent hardware device drivers

Incorporating existing C code into a simulation

Describing a system as a set of mathematical equations

Using graphical animations (see the inverted pendulum demo, penddemo)

An advantage of using S-functions is that you can build a general purpose block that you can use many times in a model, varying parameters with each instance of the block.

Passing Parameters to S-Functions How S-Functions Work