Hello, I would like to use sam.snp() function from package siggenes. But I get the following error: > sam.out.snp <- sam.snp(data.cat.ok[1:100,],class, B=100, na.replace = FALSE, check.levels = FALSE) Erreur dans sort(unique.default(x), na.last = TRUE) : 'x' doit ?tre atomique De plus : Warning message: There are 63 SNPs with at least one missing value. by random draws from the distribution of the corresponding SNP. There is a problem with sort(). Do you have any solution? Thank you in advance. Vincent.