Use as.list. Andy
> From: F Duan > > Thanks a lot. > > Your way works perfect. And one more tiny question related to > your codes: > > My data file has many columns to be omitted (suppose the > first 20 ones), but I > found "scan(myfile, what=list(rep(NULL, 20), rep(0, 5))" > doesn't work. I had to > to type "NULL" 20 times and "0" five times in the "list(...)". > > But anyway, it works and saves a lot of memory for me. Thank > you again. > > Frank > > > Quoting Gabor Grothendieck <[EMAIL PROTECTED]>: > > > Gabor Grothendieck <ggrothendieck <at> myway.com> writes: > > > > : > > : F Duan <f.duan <at> yale.edu> writes: > > : > > : > I have a very big tab-delim txt file with header and I > only want to > > import > > : > several columns into R. I checked the options for > Â"read.tableÂ" and only > > > > : > > : Try using scan with the what=list(...) and flush=TRUE arguments. > > : For example, if your data looks like this: > > : > > : 1 2 3 4 > > : 5 6 7 8 > > : 9 10 11 12 > > : 13 14 15 16 > > : > > : then you could read columns 2 and 4 into a list with: > > : > > > > oops. That should be 1 and 3. > > > > : scan(myfile, what = list(0, NULL, 0), flush = TRUE) > > : > > : or read in and convert to a data frame via: > > : > > : do.call("cbind", scan(myfile, what = list(0, NULL, 0), > flush = TRUE)) > > > > ______________________________________________ > > [EMAIL PROTECTED] mailing list > > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! > > http://www.R-project.org/posting-guide.html > > > > > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html