The times that are output from the chron() function appear to be different
depending on whether or not you associate a date with them. Check out the
example below.
library(chron)
mdy <- scan(what="")
"May/17/1983" "May/29/1983" "Jun/12/1983" "Jun/27/1983" "Jul/10/1983"
"Jul/13/1983" "Jul/19/1983" "May/29/1983" "Jun/25/1983" "Jul/5/1983"
"Jul/11/1983" "Jul/18/1983" "May/26/1983" "Jun/24/1983" "Jun/29/1983"
"Jul/19/1983" "Apr/28/1983" "Jun/6/1983" "Jun/21/1983" "Jul/9/1983"
hms <- scan(what="")
"16:00:00" "09:30:00" "12:00:00" "08:00:00" "08:00:00" "12:00:00" "08:00:00"
"13:00:00" "09:30:00" "08:00:00" "08:00:00" "09:00:00" "08:00:00" "08:00:00"
"08:00:00" "08:00:00" "10:00:00" "08:00:00" "08:00:00" "09:00:00"
> chron(times=hms)
[1] 16:00:00 09:30:00 12:00:00 08:00:00 08:00:00 12:00:00
[7] 08:00:00 13:00:00 09:30:00 08:00:00 08:00:00 09:00:00
[13] 08:00:00 08:00:00 08:00:00 08:00:00 10:00:00 08:00:00
[19] 08:00:00 09:00:00
> chron(mdy, hms)
[1] (05/17/83 15:59:59) (05/29/83 09:30:00) (06/12/83 12:00:00)
[4] (06/27/83 08:00:00) (07/10/83 08:00:00) (07/13/83 12:00:00)
[7] (07/19/83 08:00:00) (05/29/83 12:59:59) (06/25/83 09:30:00)
[10] (07/05/83 08:00:00) (07/11/83 08:00:00) (07/18/83 09:00:00)
[13] (05/26/83 08:00:00) (06/24/83 08:00:00) (06/29/83 08:00:00)
[16] (07/19/83 08:00:00) (04/28/83 09:59:59) (06/06/83 08:00:00)
[19] (06/21/83 08:00:00) (07/09/83 09:00:00)
Why does 16:00:00 get changed to 15:59:59? Why do only 10:00:00, 13:00:00, and
16:00:00 (in this example) get changed, while the other on-the-hour times
(08:00:00, 09:00:00, and 12:00:00) remain unchanged?
I am using S-PLUS 2000 Professional Release 2 on Windows NT.
Please respond to me, and I will summarize to the group.
Thanks.
JVA
`·.,, ><(((º> `·.,, ><(((º> `·.,, ><(((º> `·.,, ><(((º>
Jean V. Adams
USGS - Great Lakes Science Center
1451 Green Road
Ann Arbor, MI 48105-2807 U.S.A.
phone: (734) 214-9307
FAX: 734-994-8780
e-mail: jean_adams@usgs.gov
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