Fuzzy Logic Toolbox

dsigmf

Built-in membership function composed of the difference between two sigmoidal membership functions.

Syntax

• y = dsigmf(x,[a1 c1 a2 c2])
  

Description

The sigmoidal membership function used here depends on the two parameters a and c and is given by

The membership function dsigmf depends on four parameters, a1, c1, a2, and c2, and is the difference between two of these sigmoidal functions.

    f₁(x; a1, c₁) - f₂(x; a2, c₂)

The parameters are listed in the order: [a1 c₁ a₂ c₂].

Examples

• x=0:0.1:10;
  y=dsigmf(x,[5 2 5 7]);
  plot(x,y)
  xlabel('dsigmf, P=[5 2 5 7]')
  
  
  
  

See Also

gaussmf, gauss2mf, gbellmf, evalmf, mf2mf, pimf, psigmf, sigmf, smf, trapmf, trimf, zmf

defuzz

evalfis