Dear R users, I know how to select a subset of a data.frame or a matrix by setting some criteria, but this time, I have a long index of cases not really related to 1 or 2 criteria. And I cannot find a simple way to select cases from another data.frame based on this index (sublst in this example). > sublst<-unique(g[comp.lst[[2]],]$Subject) >sublst [1] 19 20 21 22 23 24 25 26 27 28 29 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 47 48 49 [30] 50 51 52 53 54 55 56 57 58 59 60 62 63 64 > foo.lst <- subset(gTrialList,(TrialList==1 & Subject==sublst)) Error: longer object length is not a multiple of shorter object length
> foo.lst <- subset(gTrialList,(TrialList==1)) > foo.lst[foo.lst$Subject==sublst] Error: In foo.lst$Subject == sublst : longer object length is not a multiple of shorter object length The only way I know is to use a for-loop to exhaust the index and then combine the cases back together. But will there be a simpler way to do so? Thank you very much for the help! - John ______________________________________________ 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.
