Stateflow®

Introduction to Embedded MATLAB Functions

You can use Embedded MATLAB functions to add MATLAB functions to a Stateflow chart. This capability is useful for coding algorithms that are better expressed in the textual MATLAB language than in the graphical Stateflow action language. Embedded MATLAB functions work with a subset of the MATLAB language called the Embedded MATLAB subset, which provides optimizations for generating efficient, production-quality C code for embedded applications. For more information, see Working with the Embedded MATLAB Subset.

This example shows a Simulink model with a Stateflow chart that contains an Embedded MATLAB function.

You will build this model in Building a Simulink Model with an Embedded MATLAB Function.

Note in this example that the Embedded MATLAB function can call any of these types of functions:

• Subfunctions

  Subfunctions are defined in the body of the Embedded MATLAB function. In the preceding example, avg is a subfunction. See Calling Subfunctions in the Embedded MATLAB User's Guide.

• Embedded MATLAB run-time library functions

  Embedded MATLAB run-time library functions are a subset of the functions that you can call in the MATLAB workspace. They generate C code for building targets that conform to the memory and data type requirements of embedded environments. In the preceding example, length, sqrt, and sum are examples of Embedded MATLAB run-time library functions. See Calling Embedded MATLAB Library Functions in the Embedded MATLAB User's Guide.

• Stateflow functions

  Graphical, truth table, and other Embedded MATLAB functions can be called from an Embedded MATLAB function in a Stateflow chart.

• Some MATLAB functions

  Functions that cannot be resolved as subfunctions, Embedded MATLAB run-time library functions, or Stateflow functions are resolved in the MATLAB workspace. These functions do not generate code; they execute only in the MATLAB workspace during simulation of the model. See Calling MATLAB Functions in the Embedded MATLAB User's Guide.

• Fixed-Point Toolbox™ run-time library functions

  For more information on fixed-point support in Embedded MATLAB functions, refer to Working with the Fixed-Point Embedded MATLAB Subset in the Fixed-Point Toolbox User's Guide.

Using Embedded MATLAB Functions in Stateflow Charts

Building a Simulink Model with an Embedded MATLAB Function