affy expression array data

Question

[liuyibin2005]

Hi, everyone I use the oligo package to read cel files, and use the rma function to transformed them into expression matrix, but what I got was a set of Na value. When I used box plot to visualize the data, it showed nothing, but when I use MAplot, I got plots of each sample. So I am very confused about this error. Help me please.

R code was below library(oligo) celfiles <- list.files(workDir, "\.gz$") data.raw <- read.celfiles(filenames = file.path(workDir, celfiles)) class(data.raw) # "GeneFeatureSet"

data.eset <- rma(data.raw) data.exprs <- exprs(data.eset)