On Feb 15, 2011, at 11:39 AM, Sam Steingold wrote:
I read a dataset with times in them, e.g., "09:31:29.18761".
I then parse them:
all$X.Time <- strptime(all$X.Time, format = "%H:%M:%OS6");
and get a vector of NAs (how do I check that except for a visual
inspection?)
then I do
options("digits.secs"=6);
all$X.Time <- strptime(all$X.Time, format = "%H:%M:%OS");
and it, apparently, works:
all$X.Time[2]-all$X.Time[1]
Time difference of 5.12188 secs
so, why doesn't format = "%H:%M:%OS6" work as documented?
I don't know. I get similar results on a Mac (not the most recent
version of R obviously). I interpreted the section to mean that the
format string was just "%OS<n>" but tried it both ways with identical
non-results.
> x <- "09:31:29.18761"
>
> y <- strptime(x, format = "%OS");
> y
[1] "2011-02-15 00:00:09"
> x <- "09:31:29.18761"
>
> y <- strptime(x, format = "%OS6");
> y
[1] NA
> y <- strptime(x, format = "%H:%M:%OS3");
> y
[1] NA
Also got NAs with %OS1 through %OS5
> sessionInfo()
R version 2.12.1 (2010-12-16)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods
[7] base
other attached packages:
[1] sos_1.3-0 brew_1.0-4 lattice_0.19-13
loaded via a namespace (and not attached):
[1] grid_2.12.1 tools_2.12.1
--
Sam Steingold (http://sds.podval.org/) on CentOS release 5.3 (Final)
David Winsemius, MD
West Hartford, CT
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