R: Describe arrows to add to a line.

arrow {grid} | R Documentation

## Describe arrows to add to a line.

### Description

Produces a description of what arrows to add to a line. The result can be passed to a function that draws a line, e.g., `grid.lines`.

### Usage

    arrow(angle = 30, length = unit(0.25, "inches"),
          ends = "last", type = "open")

### Arguments

`angle` | The angle of the arrow head in degrees (smaller numbers produce narrower, pointier arrows). Essentially describes the width of the arrow head.
`length` | A unit specifying the length of the arrow head (from tip to base).
`ends` | One of `"last"`, `"first"`, or `"both"`, indicating which ends of the line to draw arrow heads.
`type` | One of `"open"` or `"closed"` indicating whether the arrow head should be a closed triangle.

### Examples

    arrow()

[Package grid version 2.6.2 Index]