Dear List, I am trying to use the MTP function in the multtest package. I get the following error: > mtp<-MTP(X=exprs(eS), Y=groupMO, test="t.twosamp.unequalvar", robust=FALSE, typeone="fdr", method="sd.minP") running bootstrap... iteration = 100 200 300 400 500 600 700 800 900 1000 Error in pmin(na.rm, ...) : cannot mix 0-length vectors with others Can anyone see what I am doing wrong? Any tips will be appreciated. > sessionInfo() R version 2.5.0 (2007-04-23) x86_64-unknown-linux-gnu attached base packages: [1] "grid" "splines" "tools" "stats" "graphics" "grDevices" [7] "utils" "datasets" "methods" "base" other attached packages: multtest annaffy KEGG GO simpleaffy genefilter "1.14.0" "1.8.1" "1.16.1" "1.16.0" "2.10.31" "1.14.1" survival IDPmisc lattice affyPLM gcrma matchprobes "2.31" "0.9.1" "0.15-6" "1.12.0" "2.8.1" "1.8.1" affydata affy affyio Biobase "1.11.2" "1.14.1" "1.4.0" "1.14.0" Best regards, Boel Brynedal, PhD student, Karolinska Institutet, Sweden