this

Access chart data during simulation

Since R2020b

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Syntax

this

Description

this provides external MATLAB^® code, such as functions and apps, access to chart data during simulation.

For charts in Simulink^® models, external MATLAB code can access inputs, outputs, and local data.
For standalone charts in MATLAB, external MATLAB code can access local data and call step, input event functions, and graphical and MATLAB functions in the chart. For more information, see Execute a Standalone Chart.

example

Note

In charts in Simulink models, the keyword this is supported only as an argument to external MATLAB code. Any other use of the keyword in the chart results in a compile-time error.

Examples

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Connect Chart to MATLAB App

Create a bidirectional connection between a Stateflow^® chart and a MATLAB app created in App Designer. Call the app as an extrinsic function using this as an argument to the constructor. In the app, create a custom property to interface with the chart during simulation. In the chart, store the value returned by the function call to the app as a local data object.

In a chart that uses MATLAB as the action language, enter:

coder.extrinsic(appConstructor);
app = appConstructor(this);

Stateflow chart that uses the keyword this in a state. This chart uses MATLAB as the action language.

In a chart that uses C as the action language, enter:

app = ml.appConstructor(this);

Stateflow chart that uses the keyword this in a state. This chart uses C as the action language.

For additional examples that illustrate this workflow, see Model a Power Window Controller and Simulate a Media Player.

Change Data Value While Debugging Standalone Chart

Modify the value of the local data x while debugging a standalone Stateflow chart in MATLAB.

At the debugging prompt, enter:

this.x = 7

For more information, see Examine and Change Values of Chart Data.

Note

When debugging a chart in a Simulink model, you can access all Stateflow data directly at the debugging prompt. For more information, see View and Modify Data in the MATLAB Command Window.

Tips

Do not use the keyword this to access chart data after simulation has stopped.
Calling an external function named this from a chart disables the keyword this throughout the chart. To use the keyword, rename the extrinsic function.

Version History

Introduced in R2020b