R help - Apr 2010 - Time series and non-integer seconds

Hello,

How to handle time series data if the sampling period is a fraction of
a second? Classes such as POSIXct, chron and timeDate stores only integer
second values. Although class POSIXlt suports fractions of a second,
neither package zoo nor package xts handle POSIXlt date/time objects.

Best regards,

Peter

On 13 April 2010 at 18:49, Jeszenszky P?ter wrote:
| Hello,
| 
| How to handle time series data if the sampling period is a fraction of
| a second? Classes such as POSIXct, chron and timeDate stores only integer
| second values. Although class POSIXlt suports fractions of a second,
| neither package zoo nor package xts handle POSIXlt date/time objects.

Of course they do and they use POSIXct which was extended to cover fractional
seconds to microsecond precisions.

Set    

       options("digits.secs"=6)    

and see for yourself:

    R> now <- Sys.time()
    R> now + 1:5*0.100   # 100 msec incre
    [1] "2010-04-13 12:12:42.950103 CDT" "2010-04-13
12:12:43.050103 CDT"
    [3] "2010-04-13 12:12:43.150103 CDT" "2010-04-13
12:12:43.250103 CDT"
    [5] "2010-04-13 12:12:43.350103 CDT"
    R> 

Dirk

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