Main Content

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

Since R2020a

Guideline Publication

Control Algorithm Modeling Guidelines - Using MATLAB®, Simulink®, and Stateflow®

Sub ID Recommendations

  • NA-MAAB — a

  • JMAAB — a

MATLAB Versions



Sub ID a

These equality comparison operators shall not be used in floating-point operands:

  • ==

  • !=

  • ~=

Custom Parameter

Not Applicable

Example — Correct

Equality comparison operators are not used in floating-point operands.

Example — Incorrect

Equality comparison operator == is used in floating-point operands.


Sub ID a:

  • Due to the nature of the floating-point data type, as it contains an error, the result of the equivalence comparison operation may be false when it was expected to be true.


Model Advisor check: Check usage of floating-point expressions in Stateflow charts (Simulink Check)

Last Changed


Version History

Introduced in R2020a