

Hello,


I have a question and need your help urgently. I am new to R but want to learn it.

I have several files in a folder which I have imported to R using :
temp = list.files(pattern="*.txt")
>myfiles = lapply(temp, read.delim)
The resulting files are on the workspace stored as List[110]. So they are 110 files in the list. Each file has several different columns and rows.
My question: I would like to find and replace -999.99M with NA; Find 'T','C','A','F' and 'Y', delete them from all the 110 files.
Then, I want to write.table all the corrected files back to a folder on my computer.
Thanks for your help.
Atem.
 


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