[R] re ading specific columns

Erik Iverson iverson at biostat.wisc.edu
Fri Oct 3 23:59:22 CEST 2008

What function are you using to read in your data file?

If read.table, then see the help page for that function, specifically 
the colClasses argument "NULL".


kayj wrote:
> I have a huge txt file and I only want to get out of it  column 3 and 7.
> I tried to read the whole file and then extract the two columns, but I ran
> into a memory problem  since the file is huge. 
> Is it possible just to tell R to read these two columns without reading the
> whole file?
> Thanks

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