[R] isdst warning when rounding a range of time data: fix or suppress?

[philippgrueber]

Dear Clay, 
dear list,

I face the same problem when rounding POSIXct objects. Have you (or has
anybody) found an explanation meanwhile, or a way to work around this issue? 

Example:
opt<-options(digits.secs=3)
ts1<-as.POSIXct(c("2006-11-01 09:00:00.03", "2006-11-01 09:00:01",
"2006-11-01 09:00:01.0245", "2006-11-01 09:00:01.11","2006-11-01 09:00:03"),
tz="GMT")
ra1<-seq(2,6,1)
data<-data.frame(ts1,ra1)
data$lo1<-data$ts1==round.POSIXt(data$ts1,"secs") 
data

Even though in this example all results are correct, is there a chance that
incorrect results are returned?

Thanks,Phil







Clay Heaton wrote:
> 
> Hi, I'm working with timeseries data. The values are every 5 seconds and
> each series can last up to 4-5 days.
> 
> To generate the x-axis labels, I'm doing the following:
> 
> =========================
> # Variable for displaying hours on the x-axis
> rtime <<- as.POSIXct(round(range(timedata), "hours"))
> 
> # Variable for displaying days on the x-axis
> stime <<- as.POSIXct(round(range(timedata), "days"))
> 
> # Plot the hours on the x-axis
> axis.POSIXct(1, at=seq(rtime[1], rtime[2], by="hour"), format="%H",
> cex.axis=.6, lwd=0, lwd.ticks=1, hadj=0.2, las=2, tck=-0.02)
> 
> # Plot the days on the x-axis
> axis.POSIXct(1, at=seq(stime[1], stime[2], by="day"), format="%A",
> cex.axis=.7, line=1, lty=0, padj=-1.4)
> =========================
> 
> The data generated and the plots look fine. R issues a warning on the
> round() function when rtime is set, though. It looks like this:
> 
>> round(range(cgmtime), "hours")
> [1] "2003-11-04 14:00:00 EST" "2003-11-07 11:00:00 EST"
> Warning message:
> In if (isdst == -1) { :
>   the condition has length > 1 and only the first element will be used
>>
> 
> Am I approaching this incorrectly? Is there another way to achieve the
> same result without the warning? Or is there a way I can suppress the
> warning?
> 
> Thanks in advance,
> Clay
> 
> ______________________________________________
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> 
> 

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