# 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,`0.5`

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

`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")
```

*Documentation reproduced from package stats, version 3.1.1, License: Part of R 3.1.1*

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