search for: yearlist

...lose but does not give me a list of species for every point, visit, and year in my data set. spplist<-unique(sumPtCt$Species) spplength<-length(spplist) Pointlist<-unique(sumPtCt$Point) Pointlength<-length(Pointlist) Visitlist<-unique(sumPtCt$Visit) Visitlength<-length(Visitlist) Yearlist<-unique(sumPtCt$Year) Yearlength<-length(Yearlist) s<-rep(spplist, each=Pointlength, Visitlength, Yearlength) p<-rep(Pointlist, spplength) v<-rep(Visitlist, spplength) y<-rep(Yearlist, spplength) template<-data.frame(Species=s,Point=p, Visit=v, Year=y) ###merge template and da...

I know R has a steep learning curve, but from where I stand the slope looks like a sheer cliff. I'm pawing through the available docs and have come across examples which come close to what I want but are proving difficult for me to modify for my use. Calculating simple group means is fairly straight forward: data(PlantGrowth) attach(PlantGrowth) stack(mean(unstack(PlantGrowth)))