Fuzzy Logic Toolbox™

psigmf - Built-in membership function composed of product of two sigmoidally shaped membership functions

Syntax

y = psigmf(x,[a1 c1 a2 c2])

The sigmoid curve plotted for the vector x depends on two parameters a and c as given by

psigmf is simply the product of two such curves plotted for the values of the vector x

f₁(x; a₁, c₁) × f₂(x; a₂, c₂)

The parameters are listed in the order [a₁ c₁a₂ c₂].

x=0:0.1:10;
y=psigmf(x,[2 3 -5 8]);
plot(x,y)
xlabel('psigmf, P=[2 3 -5 8]')