Hi Everyone, I do not seem to be able to implement the PPC package for MALDI data sets. The function ppc.read.raw.nobatch calls other functions ppc.xl.get.names.of.files & ppc.options that are not given in the package. Can someone out there clarify if I am missing something. I give the function in question below. ########################### > library(ppc) > ppc.read.raw.nobatch function (directory, mz = NULL) { datafiles.list <- ppc.xl.get.names.of.files(directory) if (is.null(mz)) { pat1 <- read.table(datafiles.list[1]) mz <- pat1[, 1] } xtr <- matrix(NA, nrow = length(mz), ncol = length(datafiles.list)) for (j in 1:length(datafiles.list)) { if (ppc.options$debug) print(paste("Reading file", datafiles.list[j])) temp <- read.table(datafiles.list[j], sep = ",") xtr[, j] <- approx(temp[, 1], temp[, 2], xout = mz)$y } return(list(xtr = xtr, mz = mz, filenames = datafiles.list)) } <environment: namespace:ppc=""> ############################################# Steve.