# irts-methods

From tseries v0.9-20
by Kurt Hornik

##### Methods for Irregular Time-Series Objects

Methods for irregular time-series objects.

- Keywords
- ts

##### Usage

```
## S3 method for class 'irts':
lines(x, type = "l", \dots)
## S3 method for class 'irts':
plot(x, type = "l", plot.type = c("multiple", "single"),
xlab = "Time", ylab = NULL, main = NULL, ylim = NULL,
oma = c(6, 0, 5, 0), ...)
## S3 method for class 'irts':
points(x, type = "p", \dots)
## S3 method for class 'irts':
print(x, format = "\%Y-\%m-\%d \%H:\%M:\%S", tz = "GMT",
usetz = TRUE, format.value = NULL, \dots)
## S3 method for class 'irts':
time(x, \dots)
## S3 method for class 'irts':
value(x, \dots)
x[i]
x[i, j]
x[i, j, ...]
```

##### Arguments

- x
- an object of class
`"irts"`

; usually, a result of a call to`irts`

. - type, plot.type, xlab, ylab, main, ylim, oma
- graphical
arguments, see
`plot`

,`points`

,`lines`

,`par`

, and - format, tz, usetz
- formatting related arguments, see
`format.POSIXct`

. - format.value
- a string which specifies the formatting of the
values when printing an irregular time-series
object.
`format.value`

is passed unchanged as argument`format`

to the function`formatC`

- i, j
- indices specifying the parts to extract from an irregular time-series object.
- ...
- further arguments passed to or from other methods: for
`lines`

passed to`lines`

; for`plot`

passed to`plot`

,

##### Details

`plot`

is the method for plotting irregular time-series objects.

`points`

and `lines`

are the methods for drawing a sequence
of points as given by an irregular time-series object and joining the
corresponding points with line segments, respectively.

`print`

is the method for printing irregular time-series objects.

`time`

and `value`

are the methods for extracting the
sequence of times and the sequence of values of an irregular
time-series object.
`[.irts`

is the method for extracting parts of irregular
time-series objects.

##### Value

- For
`time`

an object of class`"POSIXct"`

representing the sequence of times. For`value`

a vector or matrix representing the sequence of values.For

`[.irts`

an object of class`"irts"`

representing the extracted part. For`plot`

,`points`

,`lines`

, and`print`

the irregular time-series object.

##### See Also

##### Examples

```
n <- 10
t <- cumsum(rexp(n, rate = 0.1))
v <- rnorm(n)
x <- irts(t, v)
x
time(x)
value(x)
plot(x)
points(x)
t <- cumsum(c(t[1], rexp(n-1, rate = 0.2)))
v <- rnorm(n, sd = 0.1)
x <- irts(t, v)
lines(x, col = "red")
points(x, col = "red")
# Multivariate
t <- cumsum(rexp(n, rate = 0.1))
u <- rnorm(n)
v <- rnorm(n)
x <- irts(t, cbind(u, v))
x
x[,1]
x[1:3,]
x[1:3,1]
plot(x)
```

*Documentation reproduced from package tseries, version 0.9-20, License: GPL (see file COPYING)*

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