Calculating First Occurance by a factor
On Wed, Apr 1, 2009 at 11:00 AM, hadley wickham <h.wickham at gmail.com> wrote:
I tried messing with the line df$FixTime[which.min(df$FixInx)] changing it to df[which.min(df$FixInx)] or adding new lines with the additional columns that I want to include, but nothing seemed to work. I'll admit I only have a mild understanding of what is going on with the function .fun. :-)
You probably want: df[which.min(df$FixInx), ]
Or alternatively: ddply(data, .(Sub, Tr, IA), subset, FixInx == min(FixInx)) which might be a bit easier to understand. Hadley