Hi All,
> act_2 Date Dtime Hour Min Second Rep 51 2006-02-22 14:52:18 14 52 18 useractivity_act 52 2006-02-22 14:52:18 14 52 18 4 55 2006-02-22 14:52:49 14 52 49 4 57 2006-02-22 14:52:51 14 52 51 4 58 2006-02-22 14:52:52 14 52 52 3 60 2006-02-22 14:54:42 14 54 42 useractivity_idle I want to change act_2 to Date Dtime Hour Min Second Rep 51 2006-02-22 14:52:18 14 52 18 useractivity_act 52 2006-02-22 14:52:18 14 52 18 4 58 2006-02-22 14:52:52 14 52 52 3 60 2006-02-22 14:54:42 14 54 42 useractivity_idle in other word, I want to keep 1st if there are many repeated value, I made the program as: rm_r<-function(act_2){ dm<-dim(act_2)[1]-1 for(i in 2:dm){ if(act_2$Rep[j]==act_2$Rep[i]){ act_2<-act_2[-j,] }else{ act_2<-act_2 } } return(act_2) } But it only remove one row..whats the problem? How should i modify it? Thanks alot. Tammy _________________________________________________________________ Invite your mail contacts to join your friends list with Windows Live Spaces. It's easy! http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx&mkt=en-us [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.