[R] Bug in order with na.last=FALSE?

[Rolf Turner]

I scanned the archives a bit and found discussion of a bug in order
when na.last=NA, but nothing about when na.last=FALSE.

Assign a (character) vector x as follows:

	x <- c("2005-08-12 12:38:35","2005-08-12 12:38:46",NA,
               "2005-08-12 12:38:27",NA)

Then executing

	o <- order(x,na.last=FALSE)
	o
	x[o]

gives

	[1] 4 3 5 1 2

and

	[1] "2005-08-12 12:38:27" NA                    NA                   
	[4] "2005-08-12 12:38:35" "2005-08-12 12:38:46"

so that the NAs are neither first nor last.  The result of order(), ``o''
should be 3 5 4 1 2.

It seems to be the complicated strings which form the entries of x that
are messing things up;

	y <- c("b","c",NA,"a",NA)
	y[order(y,na.last=FALSE)]

gives

	[1] NA  NA  "a" "b" "c"

is it ought.

				cheers,

					Rolf Turner
					rolf at math.unb.ca