Message-ID: <3.0.5.32.20010925142457.00956100@bute.st-and.ac.uk>
Date: 2001-09-25T13:24:57Z
From: Bernie McConnell
Subject: blues in c
G'Day,
I'm a little confused why the c function has the followng effect on
classes - is this a feature ? My workround [ class(cc) <- c("POSIXt",
"POSIXct") ] seems to do the job.
Many thanks
Bernie McConnell
"R version 1.3.1, 2001-08-31" on NT
> aa <- as.POSIXct("2001-09-23")
> bb <- as.POSIXct("2001-09-24")
> cc <- c(aa,bb)
> aa - bb
Time difference of -1 days
> aa - cc[2]
[1] "1969-12-31 GMT Standard Time"
Warning message:
Incompatible methods ("-.POSIXt", "-.POSIXct") for "-"
>
> class(aa)
[1] "POSIXt" "POSIXct"
> class(cc)
[1] "POSIXct"
>
> class(cc) <- c("POSIXt", "POSIXct")
> aa - cc[2]
Time difference of -1 days
Bernie McConnell
NERC SEA MAMMAL RESEARCH UNIT
Gatty Marine Lab, St Andrews University
St Andrews, Fife, KY16 8LB, Scotland.
b.mcconnell at smru.st-andrews.ac.uk
http://www.smru.st-and.ac.uk
tel: +44 (1334) 463280
fax: +44 (1334) 462632
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