On Dec 31, 2012, at 9:12 AM, Christofer Bogaso wrote:
Hello all,
Let say I have following (numeric) vector:
> x
[1] 11.00 11.25 11.35 12.01 11.14 13.00 13.25 13.35 14.01 13.14
14.50 14.75 14.85 15.51 14.64
Now, I want to create a 'Date' variable (i.e. I should be able to do
all calculations pertaining to date/time and also time-series
plotting etc.) like
2012-12-31 11:00:00 AM, 2012-12-31 11:25:00 AM, 2012-12-31 11:35:00
AM, 2012-12-31 12:01:00 PM, . . . .
Those _times_ ( _not_ Dates) cannot possibly be in %M.%S" format,
given the number of items to the right of the decimal point that are
greater than 60. So will proceed on the arguably more likely
assumption that they are in fractional minutes. To recover from that
problem, one might consider:
> as.POSIXct(paste( floor(x), round(60*(x-floor(x))) ), format="%M %S")
[1] "2012-12-31 00:11:00 PST" "2012-12-31 00:11:15 PST"
[3] "2012-12-31 00:11:21 PST" "2012-12-31 00:12:01 PST"
[5] "2012-12-31 00:11:08 PST" "2012-12-31 00:13:00 PST"
[7] "2012-12-31 00:13:15 PST" "2012-12-31 00:13:21 PST"
[9] "2012-12-31 00:14:01 PST" "2012-12-31 00:13:08 PST"
[11] "2012-12-31 00:14:30 PST" "2012-12-31 00:14:45 PST"
[13] "2012-12-31 00:14:51 PST" "2012-12-31 00:15:31 PST"
[15] "2012-12-31 00:14:38 PST"
--
David Winsemius, MD
Alameda, CA, USA
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