[R] Select first element of each factor and convert to NA

2013-02-28 Thread Cesar Terrer
Hi all, I have a dataframe of the following type: DayPlace dendrometermax 1 1 1 4684 2 1 1 4831 .. 1 1 2

Re: [R] Select first element of each factor and convert to NA

2013-02-28 Thread PIKAL Petr
Hi -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- project.org] On Behalf Of Cesar Terrer Sent: Friday, March 01, 2013 4:21 AM To: r-help@r-project.org Subject: [R] Select first element of each factor and convert to NA Hi all, I have a