Interpreted MATLAB Function

(To be removed) Apply MATLAB function or expression to input

The Interpreted MATLAB Function block will be removed in a future release. Use built-in blocks instead. For more information on updating your code, see Version History.

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Libraries:
Simulink / User-Defined Functions

Description

The Interpreted MATLAB Function block applies the specified MATLAB^® function or expression to the input. The output of the function must match the output dimensions of the block. Use the Interpreted MATLAB Function block only in the current workspace.

Some valid expressions for this block are:

sin
atan2(u(1), u(2))
u(1)^u(2)

Note

This block is slow because it calls the MATLAB parser during each integration step. Consider using built-in blocks such as the Math Function block instead. Alternatively, you can write the function as a MEX file S-function, then access it using the S-Function block.

Ports

Input

In — Input of a Interpreted MATLAB function

scalar | vector | matrix

The Interpreted MATLAB Function block accepts one real or complex input of type double and generates real or complex output of type double, depending on the setting of the Output signal type parameter.

Data Types: double

Output

Out — Output of a Interpreted MATLAB function

scalar | vector | matrix

The Interpreted MATLAB Function block accepts one real or complex input of type double and generates real or complex output of type double, depending on the setting of the Output signal type parameter.

Data Types: double

Parameters

MATLAB Function — Specify the function or expression

function (default)

Specify the function or expression. If you specify a function only, it is not necessary to include the input argument in parentheses.

Output dimensions — Specify the dimensions of the block output signal

scalar | matrix | vector | inherited

Specify the dimensions of the block output signal, for example, 2 for a two-element vector. The output dimensions must match the dimensions of the value returned by the function or expression in the MATLAB function field.

Specify -1 to inherit the dimensions from the output of the specified function or expression. To determine the output dimensions, Simulink runs the function or expression once before simulation starts.

Note

If you specify -1 for this parameter and your function has persistent variables, then the variables might update before the simulation starts. If you need to use persistent variables, consider setting this parameter to a value other than -1.

Output signal type — Specify the block output signal type

auto (default) | real | complex

Specify the output signal type of the block as real, complex, or auto. A value of auto sets the output type to be the same as the type of the input signal.

Collapse 2-D results to 1-D — Output a 2-D array as a 1-D array

off (default) | on

Select this check box to output a 2-D array as a 1-D array containing the 2-D array's elements in column-major order.

Sample time — Specify sample time in the block

scalar

Note

This parameter is not visible in the block dialog box unless it is explicitly set to a value other than -1. To learn more, see Blocks for Which Sample Time Is Not Recommended.

Block Characteristics

Data Types	double
Direct Feedthrough	yes
Multidimensional Signals	no
Variable-Size Signals	no
Zero-Crossing Detection	no

Version History

Introduced in R2011a

R2022b: To be removed

The Interpreted MATLAB Function block will be removed in a future release. Use built-in blocks instead is recommended. Use the MATLAB Function block if MATLAB code is required for modeling. You can also consider writing the function as a MEX file S-function and implement it using the S-Function block.