Main Content

jc_0800: Comparing floating-point types in Simulink

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

Equivalence comparison operators (==, ~=) shall not be used on floating-point data types.

Custom Parameter

Not Applicable

Example — Correct

Example — Incorrect

Uses equivalence comparison operators == and ~= on the floating-point data type.


Sub ID a:

  • Due to the characteristics of the floating-point, since the error is included in the value, the result of the equivalence comparison operation may be false when it was expected to be true.


Model Advisor check: Check comparison of floating point types in Simulink (Simulink Check)

Last Changed


Version History

Introduced in R2020a