I have a function (see below). This function has one object, ID. If I run the
loops by itself using a character value (ie,"VFFF1-7"), then the loops work
fine. However, when I try to insert the character value via the function call,
it doesn't work. I don't get an error, but the TotalCover.df dataframe does not
update according to the loop criteria. Any obvious problems that you can see?
################Cover Function#########################
#Define Variables
Quadrats.df<-unique(data.df$Quadrat)
TotalCover.df<-cbind(0:750/10,0,0,0,0,0,0)
colnames(TotalCover.df)<-
c("Station","Shrub","Tree","Invasive","Herb","Litter","Bare")
Shrub.df<-data.df[data.df$Layer=="Shrub",]
Tree.df<-data.df[data.df$Layer=="Tree",]
Cover.fn<-function(ID){
ShrubCover.df<-Shrub.df[Shrub.df$Quadrat==ID,]
for (j in 1:length(ShrubCover.df[,"Quadrat"])){
for (i in 1:751){
if (TotalCover.df[i,"Station"]>=ShrubCover.df[j,"Start"] &&
TotalCover.df[i,"Station"]<= ShrubCover.df[j,"Stop"])
TotalCover.df[i,"Shrub"]<- 1
}
}
TreeCover.df<-Tree.df[Tree.df$Quadrat==ID,]
for (j in 1:length(TreeCover.df[,"Quadrat"])){
for (i in 1:751){
if (TotalCover.df[i,"Station"]>=TreeCover.df[j,"Start"] &&
TotalCover.df[i,"Station"]<= TreeCover.df[j,"Stop"])
TotalCover.df[i,"Tree"]<- 1
}
}
}
Cover.fn("VFFF1-7")
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