nebular: a pure Java Fuzzy Logic API

nebular is a fuzzy logic API written in pure Java. It contains pre-defined membership functions such as sigmoidal, gaussian, pi-shaped among others.

A fuzzy set is a set whose elements have certain degree of membership. In classical sets (or bivalent, or crisps) an element belongs or not to the set. In fuzzy sets, membership functions define the degree to which an element belongs to certain set.

See the examples for examples on how to create a fuzzy set using a membership function in nebular. Or see the User Guide for details on each membership. function.

nebular uses Apache Commons Functor to create membership functions using functional programming. This way, a user can extend nebular by creating a functor (usually a UnaryFunction). nebular relies on Apache Commons Math for some of the pre-defined membership functions.

Releases

nebular 0.1 Release (March 2012)

This is the first official nebular release. The following membership functions are supported in this version.

  • Differential sigmoidal membership function
  • Gaussian membership function
  • Generalized bell-shaped membership function
  • PI-shaped membership function
  • Product sigmoidal membership function
  • Sigmoidal membership function
  • S-shaped membership function
  • Trapezoidal membership function
  • Triangular membership function
  • Z-shaped membership function