test_frame[,"col3"] or
subset(test_frame, select = col3) Vincent Deng wrote: > Dear R-helpers: > > Suppose I have a datafram called "test_frame" like this > col1 col2 col3 col4 > r1 x x x x > r2 x x x x > r3 x x x x > .. x x x x > rn x x x x > > I know I can get data of col3 by using test_frame[,3]. > > My question is, if I want to do this by specifying "col3" rather than 3, > what should I do? > > Many thanks.... > > [[alternative HTML version deleted]] > > ______________________________________________ > [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 > -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 452-1424 (M, W, F) fax: (917) 438-0894 ______________________________________________ [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
