Enum MembershipFunction 

pub enum MembershipFunction {
    Triangular {
        a: f64,
        b: f64,
        c: f64,
    },
    Trapezoidal {
        a: f64,
        b: f64,
        c: f64,
        d: f64,
    },
    Gaussian {
        mean: f64,
        sigma: f64,
    },
    Singleton {
        value: f64,
    },
    Universe,
}

A membership function that maps a crisp value x to a degree in [0, 1].

Variants

Triangular

Triangular MF — zero at a and c, peak 1.0 at b.

μ(x) = max(0, min((x-a)/(b-a), (c-x)/(c-b)))

Fields

a: f64

b: f64

c: f64

Trapezoidal

Trapezoidal MF — zero below a and above d, full membership on [b,c].

μ(x) = max(0, min((x-a)/(b-a), 1.0, (d-x)/(d-c)))

Fields

a: f64

b: f64

c: f64

d: f64

Gaussian

Gaussian MF — bell-shaped curve.

μ(x) = exp(-0.5 * ((x - mean) / sigma)^2)

Fields

mean: f64

sigma: f64

Singleton

Singleton MF — full membership at exactly one point, zero elsewhere.

Fields

value: f64

Universe

Universe of discourse — full membership everywhere.

Implementations

impl MembershipFunction

pub fn evaluate(&self, x: f64) -> f64

Evaluate the membership degree of x.

Trait Implementations

impl Clone for MembershipFunction

fn clone(&self) -> MembershipFunction

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MembershipFunction

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for MembershipFunction

fn eq(&self, other: &MembershipFunction) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for MembershipFunction