Peter Rote wrote:
> I still struggling with this:
>
> error massage:
>
>> by(AlexETF,AlexETF$Industry,function(a) {filename = paste("C:/ab/",gsub("
>> ","",a$Industry[1]),".txt",sep="")
> + print(filename)
> + write.table(a[,3,drop=FALSE],quote=FALSE,col.names=FALSE,row.names=FALSE)
>
> + }
> + )
>
> [1] "C:/ab/Accident&HealthInsurance.txt"
> Error in `[.data.frame`(a, , 3, drop = FALSE) :
> undefined columns selected
The message says that you haven't got three columns in a, so try
inserting print(dim(a)). Perhaps what you showed earlier was rownames
plus two columns?
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
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