Hello everyone,
I have got the same problem, with the same error message.
Using R 2.14.1, plyr 1.7.1, R.Studio 0.94.110, Windows XP
The plyr mailing list does not provide any help until now.
>require(plyr)
>c(sample(c(1:100), 50, replace=TRUE))->V1
>c(rep( 1:5, 10))->f1 #variable to group V1
>data.frame(cbind(V1, f1))->DF
>str(DF)
>ddply(DF$V1, DF$f1, "sd")
>ddply(.(DF$V1), .(DF$f1), "sd")
/>Error in if (empty(.data)) return(.data) : /
/missing value where TRUE/FALSE needed
/
/Thanks everyone,
/
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