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

2010-07-13 Thread 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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[R] isdst warning when rounding a range of time data: fix or suppress?

2010-03-24 Thread Clay Heaton 
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

__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.