Changes in version 2.3.2 (2021-05-19)                  

New features

  - Add non-singleton features described in the FuzzIEEE paper 'An
    Extension of the FuzzyR Toolbox for Non-Singleton Fuzzy Logic
    Systems'. This is a collaborative work with Yu Zhao.
  - Refactoring code for function showGUI; Add advanced GUI features.
    Many thanks to the contribution from science@sboldt.com.

                 Changes in version 2.3.1 (2021-01-18)                  

Bug fixes

  - Address the issue of writefis, readfis and showfis.
  - Address the issue when one or more rules do not use the first input
    variable.

                  Changes in version 2.3 (2019-11-20)                   

New features

  - Add implementation of TSK type fuzzy inference systems based on An
    extended ANFIS architecture.
  - Add new function tipper.tsk.

Bug fixes

  - Address the issue of evalfis for interval type-2 fis: it now gives a
    single (rather than two) crisp defuzzified output.

                  Changes in version 2.2 (2019-11-12)                   

New features

  - Add err.trn.fix flag to function anfis.optimise.
  - Add height option to membership functions: gbellmf,
    gbell.fuzzification, it2gbellmf, singletonmf, gaussmf, it2gaussmf,
    trapmf, it2trapmf, trimf, it2trimf, trimf.fuzzification.
  - New functions: gauss.fuzzification, it2gbell.fuzzification.
  - Change functions addfis, addmf, evalfis to include interval type-2
    features (Mamdani).

Bug fixes

  - Change function evalfis to address the issue of a fis with multiple
    outputs.
  - Address the issue of initialisation when a == 0 for funtions
    init.params.gbell and init.params.it2gbell.

Other changes

  - Export function: writefis.
  - Add DOI info for function km.da.
  - Add new package dependency: grid.
  - Add reference: A Comment on “A Direct Approach for Determining the
    Switch Points in the Karnik–Mendel Algorithm”.
  - Add reference: Type-1 and Interval Type-2 ANFIS: A Comparison.

                  Changes in version 2.1 (2017-03-24)                   

New features

  - Add Interval Type-2 ANFIS.
  - Add accuracy measure UMBRAE: A new accuracy measure based on bounded
    relative error for time series forecasting.
  - Add functions: fuzzyr.match.fun, fuzzyr.accuracy, km.da, it2gbellmf,
    it2gbell.fuzzification.

Bug fixes

  - Customise function match.fun to address the issue that functions
    cannot be matched due to environmental settings.
  - Change function gensurf to address a color issue.
  - Change function defuzz to address an issue when all membership
    grades are equal to zero.
  - Change function anfis.dMF.dP.gbellmf to address the issue of
    infinite outputs due to large factors.
  - Change function plotmf to address an issue of customised label.

Other changes

  - Hide functions: anfis.addnode, anfis.optimise.lse.
  - Minor changes to functions: anfis.optimise, anfis.optimise.gradient,
    anfis.optimise.lse, anfis.dO3.dO2, anfis.plotmf, plotvar,
    plot_graph.
  - Change function anfis.L2.which to use the direct approach for
    determining the switch points.
  - Add reference: An extended ANFIS architecture and its learning
    properties for type-1 and interval type-2 models