Fuzzy Logic Toolbox

defuzz

Defuzzify membership function

Syntax

out = defuzz(x,mf,type)

Description

defuzz(x,mf,type) returns a defuzzified value out, of a membership function mf positioned at associated variable value x, using one of several defuzzification strategies, according to the argument, type. The variable type can be one of the following:

centroid: centroid of area method
bisector: bisector of area method
mom: mean of maximum method
som: smallest of maximum method
lom: largest of maximum method

If type is not one of the above, it is assumed to be a user-defined function. x and mf are passed to this function to generate the defuzzified output.

Examples

x = -10:0.1:10;
mf = trapmf(x,[-10 -8 -4 7]);
xx = defuzz(x,mf,'centroid');

convertfis

dsigmf