Fuzzy Logic Toolbox Release Notes    

Known Software and Documentation Problems

This section describes an open Fuzzy Logic Toolbox 2.1 software bug.

ODE Solver Performance

Because most FISs contain non-smooth blocks such as Min or Max, the default ODE solver can perform poorly in some cases. One remedy is to choose a stiff solver. Several stiff solver choices are available on the Solver page of the Simulation Parameters dialog box in Simulink.

Because of blocks such as Min and Max, zero-crossing detection can also negatively impact the simulation speed. You can disable zero crossing detection on the Advanced page of the Simulation Parameters dialog box. Since this can affect the accuracy of the simulation, it is wise to compare results with and without zero-crossing detection before you disable it.

 Fuzzy Logic Toolbox 2.1 Release Notes