Date calculations
On Wed, 22 Mar 2006 00:38:20 -0600 P. H?naff wrote:
I'm a rank beginner in R and R-metrics, but experienced in matlab and other languages. I'm strugling with date arithmetics in R. I'm doing statistical analysis on financial time series, using its, which uses POSIXct objects to measure time. What is the best way to perform simple date arithmetic with these objects? I do not care about h/m/s, nor do I care about daylight saving time.
In that case I would recommend to go with the "Date" class available in
base R, e.g.
as.Date("2005-04-03") + 0:10
which should be rather self-explanatory.
The package zoo provides time series infrastructure where the time
information can be stored in "Date" (or virtually any other class).
library("zoo")
z <- zoo(rnorm(11), as.Date("2005-04-03") + 0:10)
plot(z)
hth,
Z