# ArrowLines: Create a Line That may have Arrows on the Ends In openintro: Data Sets and Supplemental Functions from 'OpenIntro' Textbooks and Labs

 ArrowLines R Documentation

## Create a Line That may have Arrows on the Ends

### Description

Similar to `lines`, this function will include endpoints that are solid points, open points, or arrows (mix-and-match ready).

### Usage

```ArrowLines(
x,
y,
lty = 1,
lwd = 2.5,
col = 1,
length = 0.1,
af = 3,
cex.pch = 1.2,
ends = c("a", "a"),
...
)
```

### Arguments

 `x` A vector of the x-coordinates of the line to be drawn. `y` A vector of the y-coordinates of the line to be drawn. This vector should have the same length as that of `x`. `lty` The line type. `lwd` The line width. `col` The line and endpoint color. `length` If an end point is an arrow, then this specifies the sizing of the arrow. See the `length` argument in the `arrows` help file for additional details. `af` A tuning parameter for creating the arrow. Usually the default (`3`) will work. If no arrow is shown, make this value larger. If the arrow appears to extend off of the line, then specify a smaller value. `cex.pch` Plotting character size (if open or closed point at the end). `ends` A character vector of length 2, where the first value corresponds to the start of the line and the second to the end of the line. A value of `"a"` corresponds to an arrow being shown, `"o"` to an open circle, and `"c"` for a closed point. `...` All additional arguments are passed to the `lines` function.

### Author(s)

David Diez

`lsegments`, `dlsegments`, `CCP`

### Examples

```
CCP(xlim = c(-6, 6), ylim = c(-6, 6), ticklabs = 2)
x <- c(-2, 0, 2, 4)
y <- c(0, 3, 0, 3)
ArrowLines(x, y, col = COL, ends = c("c", "c"))
points(x, y, col = COL, pch = 19, cex = 1.2)

CCP(xlim = c(-6, 6), ylim = c(-6, 6), ticklabs = 2)
x <- c(-3, 0, 1, 3)
y <- c(2, 1, -2, 1)
ArrowLines(x, y, col = COL, ends = c("c", "c"))
points(x, y, col = COL, pch = 19, cex = 1.2)

CCP(xlim = c(-6, 6), ylim = c(-6, 6), ticklabs = 2)
x <- seq(-2, 2, 0.01)
y <- x^2 - 3
ArrowLines(x, y, col = COL, ends = c("c", "c"))
x <- seq(-2, 2, 1)
y <- x^2 - 3
points(x, y, col = COL, pch = 19, cex = 1.2)
```

openintro documentation built on March 18, 2022, 6:17 p.m.