time {stats} | R Documentation |

## Sampling Times of Time Series

### Description

`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`

).

### Usage

time(x, ...)
## Default S3 method:
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, `0.5` the middle and `1` the 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

`ts`

, `start`

, `tsp`

,
`window`

.

`date`

for clock time, `system.time`

for CPU usage.

### Examples

cycle(presidents)
# a simple series plot: c() makes the x and y arguments into vectors
plot(c(time(presidents)), c(presidents), type="l")

[Package

*stats* version 2.2.1

Index]