- mapping factors to data frame
- >loc
- cruise station lon lat
- 1 TY1 A1 53.8073 6.7836
- 2 TY1 3 53.7757 6.7009
- 3 AZ7 A1 53.7764 6.6758
- >spe
- cruise station species abundance
- 1 TY1 A1 Ensis ensis 100
- 2 TY1 A1 Magelona 5
- 3 TY1 A1 Nemertea 17
- 4 TY1 3 Magelona 8
- 5 TY1 3 Ophelia 1200
- 6 AZ7 A1 Ophelia 950
- 7 AZ7 A1 Ensis ensis 89
- 8 AZ7 A1 Spio 1
- cruise station species abundance ID
- 1 TY1 A1 Ensis ensis 100 STA0001
- 2 TY1 A1 Magelona 5 STA0001
- 3 TY1 A1 Nemertea 17 STA0001
- 4 TY1 3 Magelona 8 STA0002
- 5 TY1 3 Ophelia 1200 STA0002
- 6 AZ7 A1 Ophelia 950 STA0003
- 7 AZ7 A1 Ensis ensis 89 STA0003
- 8 AZ7 A1 Spio 1 STA0003
- loc<-data.frame(cruise=c("TY1","TY1","AZ7"),station=c("A1",3,"A1"),lon=c(53.8073, 53.7757, 53.7764),lat=c(6.7836, 6.7009, 6.6758))
- spe<-data.frame(cruise=c(rep("TY1",5),rep("AZ7",3)),station=c(rep("A1",3),rep(3,2),rep("A1",3)),species=c("Ensis ensis", "Magelona", "Nemertea", "Magelona", "Ophelia", "Ophelia","Ensis ensis", "Spio"),abundance=c(100,5,17,8,1200,950,89,1))
- loc$ID<-paste("STA",formatC(1:nrow(loc),width=4,format="d",flag="0"),sep="")
- merge(spe, loc, all.x=TRUE)
- cruise station species abundance lon lat
- 1 AZ7 A1 Ophelia 950 53.7764 6.6758
- 2 AZ7 A1 Ensis ensis 89 53.7764 6.6758
- 3 AZ7 A1 Spio 1 53.7764 6.6758
- 4 TY1 3 Magelona 8 53.7757 6.7009
- 5 TY1 3 Ophelia 1200 53.7757 6.7009
- 6 TY1 A1 Ensis ensis 100 53.8073 6.7836
- 7 TY1 A1 Magelona 5 53.8073 6.7836
- 8 TY1 A1 Nemertea 17 53.8073 6.7836
- unique(paste(loc$cruise, loc$station, sep="-"))
- [1] "TY1-A1" "TY1-3" "AZ7-A1"
- loc <- within(loc, id <- interaction(cruise, station))
- spe <- within(spe, id <- interaction(cruise, station))
- loc$ID<-paste("STA", formatC(1:nrow(loc), width=4, format="d", flag="0"), sep="")
- as.data.frame.matrix(xtabs(abundance ~ ID + species, merge(spe, loc, all.x=T)))
- Ensis ensis Magelona Nemertea Ophelia Spio
- STA0001 100 5 17 0 0
- STA0002 0 8 0 1200 0
- STA0003 89 0 0 950 1