[R] a question on write.table

[Antonio Silva]

Dear R users

I want to write a file that contains several data frames generated in a loop
ing.
I also want the column names be written to file only when it is created in
first loop.

In the example below, when I run each line separately without "for (i in
...) { }"  it works, but when I run the looping I get an error message

X<-c("A","B","C","D","E")
Y<-c(0,1,2,3,4)

for (i in 0:3) {
Y<-Y+i
data<-data.frame(X,Y)
ifelse(file.exists("test.csv"),
 write.table(data,"test.csv",row.names =
FALSE,col.names=FALSE,sep=";",append=TRUE),
 write.table(data,"test.csv",row.names = FALSE,sep=";")
)}

Error in ifelse(file.exists("test.csv"), write.table(data, "test.csv",  :
  substituto tem comprimento zero
Além disso: Warning message:
In rep(yes, length.out = length(ans)) :
  'x' is NULL so the result will be NULL

What is going wrong here? Thanks for any comments or suggestions.

All the best.

Antonio Olinto

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