Fuzzy Logic Toolbox

trapmf

Trapezoidal-shaped built-in membership function

Syntax

y = trapmf(x,[a b c d])

The trapezoidal curve is a function of a vector, x, and depends on four scalar parameters a, b, c, and d, as given by

or, more compactly, by

The parameters a and d locate the "feet" of the trapezoid and the parameters b and c locate the "shoulders."

x=0:0.1:10;
y=trapmf(x,[1 5 7 8]);
plot(x,y)
xlabel('trapmf, P=[1 5 7 8]')