A toy dataset used to illustrate fuzzy and evidential clustering algorithms. Also called
the 'Diamond' dataset. Adapted from Windham (1985), with one outlier added.
Usage
data(butterfly)
Arguments
Format
A matrix with 12 rows and 2 column.
References
M.P. Windham. Numerical classification of proximity data with assignment measures.
Journal of classification, 2:157-172, 1985.
M.-H. Masson and T. Denoeux. ECM: An evidential version of the fuzzy c-means algorithm.
Pattern Recognition, Vol. 41, Issue 4, pages 1384-1397, 2008.