time
Sampling Times of Time Series
time creates the vector of times at which a time series was sampled.
cycle gives the positions in the cycle of each observation.
frequency returns the number of samples per unit time and
deltat the time interval between observations (see
ts).
- Keywords
- ts
Usage
time(x, ...)
"time"(x, offset = 0, ...)
cycle(x, ...)
frequency(x, ...)
deltat(x, ...)Arguments
- x
- a univariate or multivariate time-series, or a vector or matrix.
- offset
- can be used to indicate when sampling took place
in the time unit.
0(the default) indicates the start of the unit,0.5the middle and1the end of the interval. - ...
- extra arguments for future methods.
Details
These are all generic functions, which will use the
tsp attribute of x if it exists. time
and cycle have methods for class ts that coerce
the result to that class.
References
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
See Also
date for clock time, system.time
for CPU usage.
Examples
library(stats)
require(graphics)
cycle(presidents)
# a simple series plot
plot(as.vector(time(presidents)), as.vector(presidents), type = "l")
Community examples
Looks like there are no examples yet.