Hello, I would like to use fda library to compare sampled curves that are density profiles. But I encounter some problems to register my data : I know that I must use a registration function to align functions in order to have important features found in each curve occur at roughly the same argument value, prior to do subsequent analysis ( PCA and cluster analysis). But I do not know which function (if there exists one) allows me to synchronize density profiles : could help me please ? Thank you by advance Best regards Lise Bellanger -- Lise Bellanger, Universit? de Nantes D?partement de Math?matiques, Laboratoire Jean Leray UMR CNRS 6629 2, Rue de la Houssini?re BP 92208 - F-44322 Nantes Cedex 03 T?l. : (33|0) 2 51 12 59 00 (ou 43) - Fax : (33|0) 2 51 12 59 12 E-Mail : lise.bellanger at univ-nantes.fr URL : http://www.math.sciences.univ-nantes.fr/