A Question about "R"

Hi Sir/Madam,

I'm a researcher in university of Guelph, Canada and now considering  
using R to do some data analysis. I'm wondering whether there is a  
library available in R that includes algorithms for "archetypal  
analysis"? This is a method quite similar to principal components  
analysis that is designed to find "archetypes" or "pure types" from  
multidimensional data.

Any help from you is greatly appreciated.

Thanks
Juan