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na_0017: Number of called function levels

Sub ID Recommendations

  • NA-MAAB — a

  • JMAAB — Not supported

MATLAB Versions

All

Rule

Sub ID a

The number of sub-function levels shall be limited, typically to three levels.

MATLAB Function blocks that reside in the Simulink® block diagram level counts as the first level, unless it is simply a wrapper for an external MATLAB® file with a .m extension. This includes functions that are defined within the block and those in separate .m files.

Exclusions

The following function types are excluded from the number of levels:

  • Standard utility functions, such as built-in functions sqrt or log

  • Commonly used custom utility functions

Custom Parameter

Maximum function call levels

Rationale

Sub ID a:

  • Improves readability and testability

Verification

Model Advisor check: Check the number of function calls in MATLAB Function blocks (Simulink Check)

Last Changed

R2020a

Introduced in R2020a