Documentation

## Create MATLAB Function Blocks from MuPAD Expressions

### Note

MuPAD® notebooks will be removed in a future release. Use MATLAB® live scripts instead.

To convert a MuPAD notebook file to a MATLAB live script file, see `convertMuPADNotebook`. MATLAB live scripts support most MuPAD functionality, although there are some differences. For more information, see Convert MuPAD Notebooks to MATLAB Live Scripts.

Symbolic Math Toolbox™ lets you create a MATLAB function block from a symbolic expression. The generated block is available for use in Simulink® models, whether or not the computer that runs the simulations has a license for Symbolic Math Toolbox.

If you work in the MATLAB Live Editor, see Generate MATLAB Function Blocks from Symbolic Expressions. Working in the MATLAB Live Editor is recommended.

The MuPAD Notebook does not provide a function for generating a block. Therefore, to be able to create a block from the MuPAD expression:

1. In a MuPAD notebook, assign that expression to a variable.

2. Use the `getVar` function to copy that variable from a notebook to the MATLAB workspace.

For details about these steps, see Copy MuPAD Variables to the MATLAB Workspace.

When the expression that you want to use for creating a MATLAB function block appears in the MATLAB workspace, use the `matlabFunctionBlock` function to create a block from that expression.

For example, open a MuPAD notebook with the handle `notebook_handle`:

`notebook_handle = mupad;`

In this notebook, create the following symbolic expression:

`r := sqrt(x^2 + y^2)`

Use `getVar` to copy variable `r` to the MATLAB workspace:

`r = getVar(notebook_handle,'r')`

Variable `r` and its value appear in the MATLAB workspace and in the MATLAB Live Editor:

```r = (x^2 + y^2)^(1/2)```

Before generating a MATLAB Function block from the expression, create an empty model or open an existing one. For example, create and open the new model `my_system`:

```new_system('my_system') open_system('my_system')```

Since the variable and its value are in the MATLAB workspace, you can use `matlabFunctionBlock` to generate the block `my_block`:

`matlabFunctionBlock('my_system/my_block', r)`

You can open and edit the block in the MATLAB Editor. To open the block, double-click it:

```function r = my_block(x,y) %#codegen r = sqrt(x.^2+y.^2); ```

#### Mathematical Modeling with Symbolic Math Toolbox

Get examples and videos