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

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`x, y` |
coordinate vectors of points to join. |

`type` |
character indicating the type of plotting; actually any of
the |

`...` |
Further graphical parameters (see |

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).

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

`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.

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