Re: [R] Identifying unique pairs

2011-03-12 Thread Vincy Pyne
3/12/11, Petr Savicky wrote: From: Petr Savicky Subject: Re: [R] Identifying unique pairs To: r-help@r-project.org Received: Saturday, March 12, 2011, 2:10 PM On Sat, Mar 12, 2011 at 03:20:01AM -0800, Vincy Pyne wrote: > Dear R helpers > > Suppose I have a data frame as given below > &

Re: [R] Identifying unique pairs

2011-03-12 Thread Petr Savicky
On Sat, Mar 12, 2011 at 03:20:01AM -0800, Vincy Pyne wrote: > Dear R helpers > > Suppose I have a data frame as given below > > mydat = data.frame(x = c(1,1,1, 2, 2, 2, 2, 2, 5, 5, 6), y = c(10, 10, 10, 8, > 8, 8, 7, 7, 2, 2, 4)) > [...] > > unique(mydat$x) will give me 1, 2, 5, 6? i.e. 4 valu

Re: [R] Identifying unique pairs

2011-03-12 Thread Vincy Pyne
Thanks sir for your reply. Unfortunately I couldn't figure out the solution. Vincy --- On Sat, 3/12/11, Dennis Murphy wrote: From: Dennis Murphy Subject: Re: [R] Identifying unique pairs To: "Vincy Pyne" Cc: r-help@r-project.org Received: Saturday, March 12, 2011, 11:45 AM Hi

Re: [R] Identifying unique pairs

2011-03-12 Thread Dennis Murphy
Hi: This problem came up the other day - see http://stats.stackexchange.com/questions/7884/fast-ways-in-r-to-get-the-first-row-of-a-data-frame-grouped-by-an-identifier/7985#7985 Dennis On Sat, Mar 12, 2011 at 3:20 AM, Vincy Pyne wrote: > Dear R helpers > > Suppose I have a data frame as given

[R] Identifying unique pairs

2011-03-12 Thread Vincy Pyne
Dear R helpers Suppose I have a data frame as given below mydat = data.frame(x = c(1,1,1, 2, 2, 2, 2, 2, 5, 5, 6), y = c(10, 10, 10, 8, 8, 8, 7, 7, 2, 2, 4)) mydat     x y 1  1 10 2  1 10 3  1 10 4  2   8 5  2   8 6  2   8 7  2