[BioC] how to import some specific columns into R

[narges [guest]]

hi
I have a huge counts file containing tags and all the related samples (129 samples) and I want to load only some columns(samples) to DGEList object not the result(counts) of all samples.
I have used scan but it does not work.
Thanks alot
Best Regards


 -- output of sessionInfo(): 

> scan ("count.txt", what = list (0,NULL,0),skip=2,flush=TRUE)
Error in scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings,  : 
  scan() expected 'a real', got 'ENSG00000000005'
#############################
 d <- read.table("count.txt", colClasses = c(rep("character",1),rep("integer",2), rep("null",126)),header=TRUE)
Error in methods::as(data[[i]], colClasses[i]) : 
  no method or default for coercing "character" to "null"
> d <- read.table("count.txt", colClasses = c(rep("character",1),rep("integer",2), rep("NA",126)),header=TRUE)
Error in methods::as(data[[i]], colClasses[i]) : 
  no method or default for coercing "character" to "NA"

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