lines {graphics}R Documentation

Add Connected Line Segments to a Plot

Description

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

Usage

lines(x, ...)

## Default S3 method:
lines(x, y = NULL, type = "l", col = par("col"),
      lty = par("lty"), ...)

Arguments

x, y coordinate vectors of points to join.
type character indicating the type of plotting; actually any of the types as in plot.
col color to use. This can be vector of length greater than one, but only the first value will be used.
lty line type to use.
... Further graphical parameters (see par) may also be supplied as arguments, particularly, line type, lty and line width, lwd.

Details

The coordinates can be passed to lines in a plotting structure (a list with x and y components), a time series, etc. See xy.coords.

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.

References

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

See Also

points, particularly for type %in% c("p","b","o"), plot, and the underlying “primitive” plot.xy.

par for how to specify colors.

Examples

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

[Package graphics version 2.1.0 Index]