Diff. Sigmoidal MF
Difference of two sigmoids membership function
Libraries:
Fuzzy Logic Toolbox /
Membership Functions
Description
The Diff. Sigmoidal MF block implements a membership function in Simulink® based on the difference between two sigmoids. The sigmoid curves are defined by the following equation.
where k = 1,2. The parameters a1 and a2 control the slopes of the left and right curves. The parameters c1 and c2 control the points of inflection for the left and right curves.
To define a unimodal membership function with a maximum value of 1
,
specify the same signs for a1 and
a2, and select c values far
enough apart to allow for both transition areas to reach 1
.
This block is related to the Sigmoidal MF and Prod. Sigmoidal MF membership function blocks.
Ports
Input
Output
Parameters
Extended Capabilities
Version History
Introduced before R2006a