scale_size

scale_size(name=NULL, limits=NULL, breaks=NULL, labels=NULL, trans=NULL, to=c(1, 6), ...)

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Parameters

Parameters control the appearance of the scale. In addition to the parameters listed below (if any), any aesthetic can be used as a parameter, in which case it will override any aesthetic mapping.

• name: name of scale to appear in legend or on axis. Maybe be an expression: see ?plotmath
• limits: numeric vector of length 2, giving the extent of the scale
• breaks: numeric vector indicating where breaks should lie
• labels: character vector giving labels associated with breaks
• trans: a transformer to use
• to: a numeric vector of length 2 that specifies the minimum and maximum size of the plotting symbol after transformation.

Returns

This function returns a scale object.

See also

• scale_manual: for sizing discrete variables

Examples

> (p <- qplot(mpg, cyl, data=mtcars, size=cyl)) 
  
> p + scale_size("cylinders") 
  
> p + scale_size("number\nof\ncylinders") 
  
>  
> p + scale_size(to = c(0, 10)) 
  
> p + scale_size(to = c(1, 2)) 
  
>  
> # Map area, instead of width/radius 
> # Perceptually, this is a little better 
> p + scale_area() 
  
> p + scale_area(to = c(1, 25)) 
  
>  
> # Also works with factors, but not a terribly good 
> # idea, unless your factor is ordered, as in this example 
> qplot(mpg, cyl, data=mtcars, size=factor(cyl)) 
  
>  
> # To control the size mapping for discrete variable, use 
> # scale_size_manual: 
> last_plot() + scale_size_manual(values=c(2,4,6)) 
  

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© Hadley Wickham 2010