This guideline enables binding of a Simulink function only to the state and substates that require access. You also enhance readability of the chart.

The input ports of a Simulink function cannot inherit their sizes and data types. Therefore, you must set sizes and types explicitly when the inputs are not scalar data of type double.

The output ports of a Simulink function can inherit sizes and data types based on connections inside the subsystem. Therefore, you can specify sizes and types of outputs as inherited.

Tip   To minimize updates required for changes in input port properties, you can specify sizes and data types as parameters.

If the formal arguments of a function signature are scalars, verify that inputs and outputs of function calls follow the rules of scalar expansion. For more information, see How Scalar Expansion Works for Functions.

Use data store memory instead of machine-parented data. For more information, see Sharing Global Data with Multiple Charts.