scsize {ggplot} | R Documentation

## Scale: size

### Description

Linearly map size to a variable.

### Usage

    scsize(plot = .PLOT, to=c(0.8, 5))

### Arguments

`plot` | plot to add scale to.
`to` | size range in mm (numeric vector, length 2)

### Details

The mapping between size and the original variable value is not linear, but square rooted. This is because the human brain tends to percieve area rather than radius.

You can manipulate the range of the result by modifying the `to` argument.

### Author(s)

Hadley Wickham <h.wickham@gmail.com>

### Examples

    p <- ggplot(mtcars, aes=list(x=mpg, y=hp))
    ggpoint(p)
    ggpoint(p, list(size=wt))
    scsize(ggpoint(p, list(size=wt)), c(1,10))
    scsize(ggpoint(p, list(size=sqrt(wt))), c(1,5))

[Package ggplot version 0.2.2 Index]