Hi the list, Is it a bug? The function cls.attrib seems to not work with integer : values <- round(runif(50,1,10)) dim(values) <- c(10,5) valuesBis <- as.integer(values) dim(valuesBis) <- c(10,5) cluster <- rep(1:2,5) library(clv) cls.attrib(values,cluster) cls.attrib(valuesBis,cluster) Christophe