Description
scale_size() scales area, scale_radius() scales radius. The sizeaesthetic is most commonly used for points and text, and humans perceivethe area of points (not their radius), so this provides for optimalperception. scale_size_area() ensures that a value of 0 is mappedto a size of 0. scale_size_binned() is a binned version of scale_size() thatscales by area (but does not ensure 0 equals an area of zero). For a binnedequivalent of scale_size_area() use scale_size_binned_area().
Usage
scale_size( name = waiver(), breaks = waiver(), labels = waiver(), limits = NULL, range = c(1, 6), transform = "identity", trans = deprecated(), guide = "legend")scale_radius( name = waiver(), breaks = waiver(), labels = waiver(), limits = NULL, range = c(1, 6), transform = "identity", trans = deprecated(), guide = "legend")
scale_size_binned( name = waiver(), breaks = waiver(), labels = waiver(), limits = NULL, range = c(1, 6), n.breaks = NULL, nice.breaks = TRUE, transform = "identity", trans = deprecated(), guide = "bins")
scale_size_area(name = waiver(), ..., max_size = 6)
scale_size_binned_area(name = waiver(), ..., max_size = 6)
Arguments
The name of the scale. Used as the axis or legend title. If One of: A numeric vector of positions A function that takes the limits as input and returns breaksas output (e.g., a function returned by One of: A character vector giving labels (must be same length as An expression vector (must be the same length as breaks). See ?plotmath for details. A function that takes the breaks as input and returns labelsas output. Also accepts rlang lambda functionnotation. One of: A numeric vector of length two providing limits of the scale.Use A function that accepts the existing (automatic) limits and returnsnew limits. Also accepts rlang lambda functionnotation.Note that setting limits on positional scales will remove data outside of the limits.If the purpose is to zoom, use the limit argument in the coordinate system(see a numeric vector of length 2 that specifies the minimum andmaximum size of the plotting symbol after transformation. For continuous scales, the name of a transformation objector the object itself. Built-in transformations include "asn", "atanh","boxcox", "date", "exp", "hms", "identity", "log", "log10", "log1p", "log2","logit", "modulus", "probability", "probit", "pseudo_log", "reciprocal","reverse", "sqrt" and "time". A transformation object bundles together a transform, its inverse,and methods for generating breaks and labels. Transformation objectsare defined in the scales package, and are called A function used to create a guide or its name. See An integer guiding the number of major breaks. The algorithmmay choose a slightly different number to ensure nice break labels. Willonly have an effect if Logical. Should breaks be attempted placed at nice valuesinstead of exactly evenly spaced between the limits. If Arguments passed on to One of: A numeric vector of positions A function that given the limits returns a vector of minor breaks. Alsoaccepts rlang lambda function notation. Whenthe function has two arguments, it will be given the limits and majorbreaks. One of: Function that handles limits outside of the scale limits(out of bounds). Also accepts rlang lambdafunction notation. The default ( Missing values will be replaced with this value. For position scales, a vector of range expansion constants used to add somepadding around the data to ensure that they are placed some distanceaway from the axes. Use the convenience function For position scales, The position of the axis. The The super class to use for the constructed scale Size of largest points.waiver(), the default, the name of the scale is taken from the firstmapping used for that aesthetic. If NULL, the legend title will beomitted.NULL for no breakswaiver() for the default breaks computed by thetransformation objectscales::extended_breaks()).Also accepts rlang lambda function notation.NULL for no labelswaiver() for the default labels computed by thetransformation objectbreaks)NULL to use the default scale rangeNA to refer to the existing minimum or maximumcoord_cartesian()).transform_<name>. Iftransformations require arguments, you can call them from the scalespackage, e.g. scales::transform_boxcox(p = 2).You can create your own transformation with scales::new_transform().
Deprecated in favour oftransform.guides() for more information.breaks = waiver(). Use NULL to use the defaultnumber of breaks given by the transformation.TRUE (default)the scale will ask the transformation object to create breaks, and thismay result in a different number of breaks than requested. Ignored ifbreaks are given explicitly.continuous_scale
minor_breaksNULL for no minor breakswaiver() for the default breaks (one minor break betweeneach major break)oobscales::censor()) replaces out ofbounds values with NA.scales::squish() for squishing out of bounds values into range.scales::squish_infinite() for squishing infinite values into range.na.valueexpandexpansion()to generate the values for the expand argument. The defaults are toexpand the scale by 5% on each side for continuous variables, and by0.6 units on each side for discrete variables.positionleft or right for y axes, top or bottom for x axes.callcall used to construct the scale for reporting messages.super
See Also
scale_size_area() if you want 0 values to be mappedto points with size 0. scale_linewidth() if you want to scale the widthof lines.
The documentation for differentiation related aesthetics.
Examples
p <- ggplot(mpg, aes(displ, hwy, size = hwy)) + geom_point()pp + 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()# Binning can sometimes make it easier to match the scaled data to the legendp + scale_size_binned()# This is most useful when size is a countggplot(mpg, aes(class, cyl)) + geom_count() + scale_size_area()# If you want to map size to radius (usually bad idea), use scale_radiusp + scale_radius()Run the code above in your browser using DataLab
