# lines

##### Add Connected Line Segments to a Plot

A generic function taking coordinates given in various ways and joining the corresponding points with line segments.

- Keywords
- aplot

##### Usage

```
lines(x, ...)
"lines"(x, y = NULL, type = "l", ...)
```

##### Arguments

- x, y
- coordinate vectors of points to join.
- type
- character indicating the type of plotting; actually any of
the
`type`

s as in`plot.default`

. - ...
- Further graphical parameters (see
`par`

) may also be supplied as arguments, particularly, line type,`lty`

, line width,`lwd`

, color,`col`

and for`type = "b"`

,`pch`

. Also the line characteristics`lend`

,`ljoin`

and`lmitre`

.

##### Details

The coordinates can be passed in a plotting structure
(a list with `x`

and `y`

components), a two-column matrix, a
time series, .... See `xy.coords`

. If supplied
separately, they must be of the same length.

The coordinates can contain `NA`

values. If a point contains
`NA`

in either its `x`

or `y`

value, it is omitted from
the plot, and lines are not drawn to or from such points. Thus
missing values can be used to achieve breaks in lines.

For `type = "h"`

, `col`

can be a vector and will be recycled
as needed.

`lwd`

can be a vector: its first element will apply to lines but
the whole vector to symbols (recycled as necessary).

##### References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
*The New S Language*.
Wadsworth & Brooks/Cole.

##### See Also

`lines.formula`

for the formula method;
`points`

, particularly for `type %in% c("p","b","o")`

,
`plot`

,
and the workhorse function `plot.xy`

.

`abline`

for drawing (single) straight lines.

`par`

for line type (`lty`

) specification and how to
specify colors.

##### Examples

`library(graphics)`

```
# draw a smooth line through a scatter plot
plot(cars, main = "Stopping Distance versus Speed")
lines(stats::lowess(cars))
```

*Documentation reproduced from package graphics, version 3.2.0, License: Part of R 3.2.0*