Why do I receive a division by zero warning when using the Fuzzy Logic Controller block in Fuzzy Logic Toolbox 2.2.8 (R2008b)?

I have a simple model with a Fuzzy Logic Controller block. I unchecked the option "Conditional input branch execution" in Configuration Parameters and one of my inputs lies outside of the membership definitions. The de-fuzzification block inside the fuzzy logic controller will give the following warning:

 Warning: Division by zero in 'div_by_zero/Fuzzy Logic  Controller/FIS Wizard/Defuzzification1/Averaging(COA)'.

Answer 1

[MathWorks Support Team]

This enhancement has been incorporated in Release 2009b (R2009b). For previous product releases, read below for any possible workarounds:

The warning is displayed because there is an input of zero for the Divide block inside the de-fuzzification subsystem.

To work around this issue activate the option "Conditional input branch execution" in Configuration Parameters.