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Check usage of floating-point expressions in Stateflow charts

Check ID: mathworks.maab.jc_0481

Guideline: jc_0481: Use of hard equality comparisons for floating point numbers in Stateflow®


Identify equal to operations(==) in expressions where at least one side of the expression is a floating-point variable or constant.

This check requires a Simulink® Check™ and Stateflow license.

Check Parameterization

This check does not include sub-checks because the MAB modeling guideline provides only one sub ID.

For reference, the MAB guideline sub ID(s) that are recommended for use by the NA-MAAB and JMAAB modeling standards organizations are:

  • NA-MAAB — a

  • JMAAB — a

Results and Recommended Actions

ConditionRecommended Action
Expressions use equality comparison operations(==, !=, ~=) where at least one side of the expression is a floating-point variable or constant.Modify the specified expressions to avoid equality comparison operations between floating-point expressions.
The Model Advisor could not determine the data types in expressions with equality operations.Typecast the specified expressions explicitly to allow Model Advisor to determine the data types.

Capabilities and Limitations

  • Does not run on library models.

  • Analyzes content of library-linked blocks. By default, the input parameter Follow links is set to on.

  • Analyzes content in masked subsystems. By default, the input parameter Look under masks is set to graphical.

  • Allows exclusions of blocks and charts.