Hello,
ifelse is a vectorized version of if/else, you want the normal if/else.
if(file.exists(... etc ...)
[...]
else
[...]
Hope this helps,
Rui Barradas
Citando Antonio Silva <aolinto....@gmail.com>:
> 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
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.htmland provide commented,
> minimal, self-contained, reproducible code.
[[alternative HTML version deleted]]
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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