R: Add Line Segments to a Plot

segments {graphics} | R Documentation

## Add Line Segments to a Plot

### Description

Draw line segments between pairs of points.

### Usage

    segments(x0, y0, x1 = x0, y1 = y0,
             col = par("fg"), lty = par("lty"), lwd = par("lwd"),
             ...)

### Arguments

`x0, y0` | coordinates of points from which to draw.
`x1, y1` | coordinates of points to which to draw. At least one must be supplied.
`col, lty, lwd` | graphical parameters as in `par`, possibly vectors. `NA` values in `col` cause the segment to be omitted.
`...` | further graphical parameters (from `par`), such as `xpd` and the line characteristics `lend`, `ljoin` and `lmitre`.

### Details

For each `i`, a line segment is drawn between the point `(x0[i], y0[i])` and the point `(x1[i], y1[i])`. The coordinate vectors will be recycled to the length of the longest.

The graphical parameters `col`, `lty` and `lwd` can be vectors of length greater than one and will be recycled if necessary.

### References

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

### See Also

`arrows`, `polygon` for slightly easier and less flexible line drawing, and `lines` for the usual polygons.

### Examples

    x <- stats::runif(12); y <- stats::rnorm(12)
    i <- order(x, y); x <- x[i]; y <- y[i]
    plot(x, y, main = "arrows(.) and segments(.)")
    ## draw arrows from point to point :
    s <- seq(length(x)-1)  # one shorter than data
    arrows(x[s], y[s], x[s+1], y[s+1], col= 1:3)
    s <- s[-length(s)]
    segments(x[s], y[s], x[s+2], y[s+2], col= 'pink')

[Package graphics version 4.0.5 Index]