sorting a data frame

["Data Analytics Corp." <dataanalytics@earthlink.net>]

Good morning,

I posted a question yesterday regarding sorting a data frame.  The 
problem is that the sort order is not correct when I use sort.col.  I 
received many responses, all saying basically the same thing - I must 
have a factor.  I actually checked this before posting the query and all 
was numeric.  So let me try again but be more explicit this time, 
because I'm very puzzled.
I have a client file that has the dates as 1.2008, 4.2007, etc.  The 
commands and example I used along with the as.numeric() checks are 
below.  As you can see, the sort is not correct.  I still don't 
understand why.  Any hints?
> y <- c(1.2008, 4.2007, 5.2007, 6.2007, 7.2007, 8.2007, 9.2007, 
10.2007, 11.2007, 12.2007)
> y
[1]  1.2008  4.2007  5.2007  6.2007  7.2007  8.2007  9.2007 10.2007 
11.2007 12.2007
> is.numeric(y)
[1] T
> x <- data.frame(yr = (y - floor(y))*10000, month = floor(y))
> x
    yr month
1 2008     1
2 2007     4
3 2007     5
4 2007     6
5 2007     7
6 2007     8
7 2007     9
8 2007    10
9 2007    11
10 2007    12
> is.numeric(x$month)
[1] T
> sort.col(x, "@ALL", 1:2)
    yr month
6 2007     8
7 2007     9
8 2007    10
9 2007    11
10 2007    12
2 2007     4
3 2007     5
4 2007     6
5 2007     7
1 2008     1
>


Any help is appreciated.

Walt Paczkowski