On 15/02/2011 11:40 AM, Sam Steingold wrote:
what does the output for [[]] mean here: > all$X.Time[5] [1] "2011-02-15 09:32:26.37222" > all$X.Time[[5]] [1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
You didn't tell us what X.Time was, but it looks like a POSIXlt object, which is stored internally as a list of 9 vectors. You're seeing the 5th of those, which should be the month number (Jan=0, Feb=1, ...).
> all$X.Time[1] [1] "2011-02-15 09:31:29.18761" > all$X.Time[[1]] [1] 29.18761 34.30949 36.38144 12.28500 26.37222 47.00837 40.20271 32.83765 [9] 54.56998 28.56961 55.96641 28.91920 32.29962 10.94081 34.31731 3.21796 [17] 58.12660 19.69056 55.99009 45.76731 46.52072
The first vector is the second.
also, > all$X.Time[0] character(0) why no error? I thought that vectors were 1-based.
Yes, but indexing by 0 or negative numbers has special meaning: see the R Language Definition manual.
Duncan Murdoch ______________________________________________ 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.
