This file contains six extra functions. The ahull function is a helper function to calculate the approximated convex hull. The no.scalefn and no.rescalefn functions allow us to use the archetype algorithm without standardizing the data (see stepArchetypesRawData). The other three functions are called by the archetypoid algorithm (archetypoids). All these functions are therefore not solely used.
Vinue, G., Epifanio, I., and Alemany, S., (2015). Archetypoids: a new approach to define representative archetypal data, Computational Statistics and Data Analysis 87, 102--115.
Epifanio, I., Vinue,, G., and Alemany, S., (2013). Archetypal analysis: contributions for estimating boundary cases in multivariate accommodation problem, Computers & Industrial Engineering 64, 757--765.
Eugster, M. J., and Leisch, F., (2009). From Spider-Man to Hero - Archetypal Analysis in R, Journal of Statistical Software 30, 1--23, tools:::Rd_expr_doi("10.18637/jss.v030.i08").
stepArchetypesRawData, archetypoids