Changes in version 2023-04-28                      

    o   Updated.

                     Changes in version 2018-04-25                      

    o   Error fixed.

                     Changes in version 2018-04-24                      

    o   Demo for Sigma-K-means added.

                     Changes in version 2018-04-21                      

    o   Sigma-K-means added.

                     Changes in version 2017-11-18                      

    o   Minor problem fixed.

    o   New functionality added.

                     Changes in version 2017-09-25                      

    o   Error fixed.

                     Changes in version 2017-09-03                      

    o   New functions added.

                     Changes in version 2016-12-03                      

    o   Reference fixed.

                     Changes in version 2016-12-02                      

    o   Reference added.

    o   Running time fixed.

                     Changes in version 2016-12-01                      

    o   New functions added.

                     Changes in version 2016-04-14                      

    o   New functions added.

                     Changes in version 2015-10-03                      

    o   Memory allocation error fixed.

                     Changes in version 2015-09-30                      

    o   First version built.