Hello list members
I have a problem with modifying a data.frame.
As an example given is a data.frame called ex :
ex<-data.frame(id=c(1,2,3,4,5,6),obs=c(14,9,20,36,55,47),eff=c("A","A","B","C","C","C"))
After that I would like to modify the object ex with the following short script:
for (i in ex) {
if(ex[i,3]=="A"|| ex[i,3]=="C"){
ex[i,4]<--9999
}
else {
ex[i,4]<-10
}
}
This script is creating an error message:
Fehler in if (ex[i, 3] == "A" || ex[i, 3] == "C") { :
Fehlender Wert, wo TRUE/FALSE nötig ist
Why this script doesn't work properly?
Thanks a lot for your hints
Beat
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