omitting columns from a data frame
Hi Erin, See inline.
On Mon, Jun 20, 2011 at 8:45 PM, Erin Hodgess <erinm.hodgess at gmail.com> wrote:
Dear R People: I have a data frame, xm1, which has 12 rows and 4 columns. If I put is xm1[,-4], I get all rows, and columns 1 - 3, which is as it should be.
Okay, so you know how to use the column number to omit columns.
Now, is there a way to use the names of the columns to omit them, please?
You have all the pieces (the column names, and the knowledge that you can omit columns by their index). Homework: find a way to return the column numbers given the column names (hint). Cheers, Josh
Thanks so much in advance! Sincerely, Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: erinm.hodgess at gmail.com
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Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/