TRAPEZOIDAL REPRESENTATION OF A FUZZY MEMBER FUNCTION
f
^

+ 1 ++
 /. . \
 0 / . 1 . \ 0
 / . . \
+++++> x
 0 l0 l1 r1 r0
x = value to find the membership to the fuzzy set
s = f(x) = SureFactor fuzzy value of the membership
before l0 s = f(x) = 0 = not member
between l0 and l1 s = f(x) = linearly grow from 0 to 1 = from non member to full member
between l1 and r1 s = f(x) = 1 = full member
between r1 and r0 s = f(x) = linearly grow from 0 to 1 = from non member to full member
after r0 s= f(x) = 0 = not member
l0:
l1:
r1:
r0:
value:
