

   RRuussppiinnii DDaattaa

        data(ruspini)

   FFoorrmmaatt::

        A data frame with 75 observations on 2 variables giving
        the x and y coordinates of the points, respectively.

   DDeessccrriippttiioonn::

        The Ruspini data set, consisting of 75 points in four
        groups that is popular for illustrating clustering
        techniques.

   SSoouurrccee::

        E. H. Ruspini (1970): Numerical methods for fuzzy clus-
        tering.  Inform. Sci., 2, 319-350.

   RReeffeerreenncceess::

        Anja Struyf, Mia Hubert & Peter J. Rousseeuw (1996):
        Clustering in an Object-Oriented Environment.  Journal
        of Statistical Software, 1.  <URL:
        http://www.stat.ucla.edu/journals/jss/>

   EExxaammpplleess::

        data(ruspini)

        ## Plot similar to Figure 4 in Stryuf et al (1996)
        plot(pam(ruspini, 4), ask = TRUE)

        data(ruspini)

        ## Plot similar to Figure 4 in Stryuf et al (1996)
        plot(pam(ruspini, 4), ask = TRUE)

        ## Plot similar to Figure 6 in Stryuf et al (1996)
        plot(fanny(ruspini, 5))

        ## Plot similar to Figure 6 in Stryuf et al (1996)
        plot(fanny(ruspini, 5))

