You can also take out multiple cells by using a vector of negative numbers so in the example below: A <- c(1,2,3,4) C <- A[c(-1,-2)] #takes out first two C # output : [1] 3 4 you can also take adv. of ranges.. the following two pieces of code does the same: C <- A[-c(1:2)] C <- A[c(-1:-2)] ________________________________________ From: gov2001-l-bounces at lists.fas.harvard.edu [gov2001-l-bounces at lists.fas.harvard.edu] On Behalf Of charlotte cavaille [charlotte.cavaille at gmail.com] Sent: Thursday, February 19, 2009 9:53 AM To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] Question about R the [ ] after the vector/matrix's name allows you to take elements from the object, if you put a "-" then it will tell R to take elements out. thus in your case: if A <- c (1,2,3,4) then B <- A[-1] will take the first element out C<- A[-3] will take the third element out to take the third row of a matrix Z out you go : Z[-3, ] to take the thrid column out : Z[ , -3] (the space " " tells R to take the third row all columns out or the third column all rows out, i.e. space = all) hope it is clear enough! 2009/2/19 Olena Ageyeva <eageeva at hotmail.com<mailto:eageeva at hotmail.com>> Hello, All. Does anyone know how to exclude one item from a vector? I have a vector (a,b,c,d,e) and I need just (b,c,d,e). Sincerely, Olena Ageyeva ________________________________ See how Windows Mobile brings your life together?at home, work, or on the go. See Now<http://clk.atdmt.com/MRT/go/msnnkwxp1020093182mrt/direct/01/> _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu<mailto:gov2001-l at lists.fas.harvard.edu> http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l