# scale_size

##### Scales for area or radius

`scale_size`

scales area, `scale_radius`

scales radius. The size
aesthetic is most commonly used for points and text, and humans perceive
the area of points (not their radius), so this provides for optimal
perception. `scale_size_area`

ensures that a value of 0 is mapped
to a size of 0.

##### Usage

```
scale_radius(name = waiver(), breaks = waiver(), labels = waiver(),
limits = NULL, range = c(1, 6), trans = "identity",
guide = "legend")
```scale_size(name = waiver(), breaks = waiver(), labels = waiver(),
limits = NULL, range = c(1, 6), trans = "identity",
guide = "legend")

scale_size_area(..., max_size = 6)

##### Arguments

- name
The name of the scale. Used as the axis or legend title. If

`waiver()`

, the default, the name of the scale is taken from the first mapping used for that aesthetic. If`NULL`

, the legend title will be omitted.- breaks
One of:

`NULL`

for no breaks`waiver()`

for the default breaks computed by the transformation objectA numeric vector of positions

A function that takes the limits as input and returns breaks as output

- labels
One of:

`NULL`

for no labels`waiver()`

for the default labels computed by the transformation objectA character vector giving labels (must be same length as

`breaks`

)A function that takes the breaks as input and returns labels as output

- limits
A numeric vector of length two providing limits of the scale. Use

`NA`

to refer to the existing minimum or maximum.- range
a numeric vector of length 2 that specifies the minimum and maximum size of the plotting symbol after transformation.

- trans
Either the name of a transformation object, or the object itself. Built-in transformations include "asn", "atanh", "boxcox", "exp", "identity", "log", "log10", "log1p", "log2", "logit", "probability", "probit", "reciprocal", "reverse" and "sqrt".

A transformation object bundles together a transform, its inverse, and methods for generating breaks and labels. Transformation objects are defined in the scales package, and are called

`name_trans`

, e.g.`scales::boxcox_trans()`

. You can create your own transformation with`scales::trans_new()`

.- guide
A function used to create a guide or its name. See

`guides()`

for more info.- ...
Arguments passed on to

`continuous_scale`

- name
The name of the scale. Used as the axis or legend title. If

`waiver()`

, the default, the name of the scale is taken from the first mapping used for that aesthetic. If`NULL`

, the legend title will be omitted.- breaks
One of:

`NULL`

for no breaks`waiver()`

for the default breaks computed by the transformation objectA numeric vector of positions

A function that takes the limits as input and returns breaks as output

- minor_breaks
One of:

`NULL`

for no minor breaks`waiver()`

for the default breaks (one minor break between each major break)A numeric vector of positions

A function that given the limits returns a vector of minor breaks.

- labels
One of:

`NULL`

for no labels`waiver()`

for the default labels computed by the transformation objectA character vector giving labels (must be same length as

`breaks`

)A function that takes the breaks as input and returns labels as output

- limits
A numeric vector of length two providing limits of the scale. Use

`NA`

to refer to the existing minimum or maximum.- oob
Function that handles limits outside of the scale limits (out of bounds). The default replaces out of bounds values with

`NA`

.- na.value
Missing values will be replaced with this value.

- trans
Either the name of a transformation object, or the object itself. Built-in transformations include "asn", "atanh", "boxcox", "exp", "identity", "log", "log10", "log1p", "log2", "logit", "probability", "probit", "reciprocal", "reverse" and "sqrt".

A transformation object bundles together a transform, its inverse, and methods for generating breaks and labels. Transformation objects are defined in the scales package, and are called

`name_trans`

, e.g.`scales::boxcox_trans()`

. You can create your own transformation with`scales::trans_new()`

.- guide
A function used to create a guide or its name. See

`guides()`

for more info.- position
The position of the axis. "left" or "right" for vertical scales, "top" or "bottom" for horizontal scales

- super
The super class to use for the constructed scale

- expand
Vector of range expansion constants used to add some padding around the data, to ensure that they are placed some distance away from the axes. Use the convenience function

`expand_scale()`

to generate the values for the`expand`

argument. The defaults are to expand the scale by 5% on each side for continuous variables, and by 0.6 units on each side for discrete variables.

- max_size
Size of largest points.

##### See Also

`scale_size_area()`

if you want 0 values to be mapped
to points with size 0.

##### Examples

```
# NOT RUN {
p <- ggplot(mpg, aes(displ, hwy, size = hwy)) +
geom_point()
p
p + scale_size("Highway mpg")
p + scale_size(range = c(0, 10))
# If you want zero value to have zero size, use scale_size_area:
p + scale_size_area()
# This is most useful when size is a count
ggplot(mpg, aes(class, cyl)) +
geom_count() +
scale_size_area()
# If you want to map size to radius (usually bad idea), use scale_radius
p + scale_radius()
# }
```

*Documentation reproduced from package ggplot2, version 3.1.1, License: GPL-2 | file LICENSE*