The ?data.table page describing arg i says:
"integer and logical vectors work the same way they do in
[.data.frame. Other than NAs in logical i are treated as FALSE and a
single NA logical is not recycled to match the number of rows, as it
is in[.data.frame."
however, I get this:
> packageVersion("data.table")
[1] ‘1.8.9’
> DT1 <- data.table(a = 1:5)
> DT1[as.logical(NA)]
a
1: NA
so it seems that if there is a single logical NA it not only is not
recycled but it also is not regarded as FALSE (whereas the quoted
statement seems to say a logical NA is regarded as FALSE in all
cases).
Is this intended?
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