hi,

i have such a file

head(mycounts[,1:4])
  AT2G26520 AT2G26530 AT2G26540 AT2G26510
1 AT2G26520   0.00000   0.51688   0.57686
2 AT2G26530   0.51688   0.00000   0.54974
3 AT2G26540   0.57686   0.54974   0.00000
4 AT2G26510   0.48842   0.52830   0.58760
5 AT2G23320   0.60273   0.64324   0.53196
6 AT2G39720   0.50206   0.54113   0.54894

but i need it like this

head(mycounts[,1:4])
                       AT2G26520 AT2G26530 AT2G26540 AT2G26510
1 AT2G26520   0.00000   0.51688   0.57686
2 AT2G26530   0.51688   0.00000   0.54974
3 AT2G26540   0.57686   0.54974   0.00000
4 AT2G26510   0.48842   0.52830   0.58760
5 AT2G23320   0.60273   0.64324   0.53196
6 AT2G39720   0.50206   0.54113   0.54894

but when i edit my file by adding tab to the first column i cant read my file anymore

and this is the error

Error in scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings,  : 
  line 1 did not have 2857 elements

how i can read my file as i need ????/

thank you

This is a basic R question, that doesn't really have anything to do with Bioconductor. In future, please direct this sort of question to R-help@r-project.org. Anyway, I doubt that your #2 is really what you want. Instead I would imagine you want the first column to be your row names. In which case you want to do

write.table(mycounts, "somefilename.txt", row.names = FALSE, colnames = TRUE, quote = FALSE)

mycounts <- read.table('somefilename.txt")

Which seems a bit silly - if you want those data in R, and you have them in R, why bother writing out and reading back in?