S-Function (Simulink Reference)

Include an S-function in a model.

Library

User-Defined Functions

Description

The S-Function block provides access to S-functions from a block diagram. The S-function named as the S-function name parameter can be a Level-1 M-file or a Level-1 or Level-2 C MEX-file S-function (see Overview of S-Functions in Writing S-Functions for information on how to create S-functions).

Note Use the M-File S-Function block to include a Level-2 M-file S-function in a block diagram.

The S-Function block allows additional parameters to be passed directly to the named S-function. The function parameters can be specified as MATLAB expressions or as variables separated by commas. For example,

```
A, B, C, D, [eye(2,2);zeros(2,2)]
```

Note that although individual parameters can be enclosed in brackets, the list of parameters must not be enclosed in brackets.

The S-Function block displays the name of the specified S-function and the number of input and output ports specified by the S-function. Signals connected to the inputs must have the dimensions specified by the S-function for the inputs.

Data Type Support

Depends on the implementation of the S-Function block.

Parameters and Dialog Box

S-function name: The S-function name.
S-function parameters: Additional S-function parameters. See the preceding block description for information on how to specify the parameters.
S-function modules: This parameter applies only if this block represents a C MEX-file S-function and you intend to use the Real-Time Workshop to generate code from the model containing the block. See "S-Function Module Names for Real-Time Workshop Builds" in the Real-Time Workshop online documentation for information on using this parameter.

Characteristics

Direct Feedthrough
Depends on contents of S-function

Sample Time
Depends on contents of S-function

Scalar Expansion
Depends on contents of S-function

Dimensionalized
Depends on contents of S-function

Zero Crossing
No

Direct Feedthrough	Depends on contents of S-function
Sample Time	Depends on contents of S-function
Scalar Expansion	Depends on contents of S-function
Dimensionalized	Depends on contents of S-function
Zero Crossing	No

Selector S-Function Builder