Hello all, First of all I'd like to apologise in advance because this is probably a very na?ve question. I am trying to get to grips with R and I am trying to practice on my own data using some of the scripts we were given in the Milan BioC course. What I report below is the error message I get when I try to run this simple script to transform the data: > X <- exprs(data) > X[X < 20] <- 20 > X[X > 8000] <- 8000 > mmfilt <- function (r = 5, d = 500, na.rm =TRUE) { + function(x) { + minval <- min(x, na.rm = na.rm) + maxval <- max(x, na.rm = na.rm) + (maxval/minval > r) && (maxval - minval > d) + } + } > mmfun <- mmfilt() > fffun <- filterfun(mmfun) > sub <- genefilter (X, fffun) > sum(sub) [1] 11478 > X <- X [sub, ] > X <- log2(X) > datasub <- data [sub, ] Error in data[sub, ] : (subscript) logical subscript too long Does anybody have any idea as to what may be happening here? Thanks in advance and sorry if this is a trivial question, F?tima _______ F?tima N??ez, PhD Centre for Cancer Research (CIC) University of Salamanca-CSIC Campus Unamuno 37007 Salamanca?????????????????????????????????????????????????? Spain Phone: + 34 923 294802 Fax:?????+ 34 923 294743 E-mail: fnunez@usal.es