scale_brewer

scale_colour_brewer(name=NULL, palette=1, type="qual", limits=NULL, breaks=NULL, labels=NULL, formatter=identity, ...)
scale_fill_brewer(name=NULL, palette=1, type="qual", limits=NULL, breaks=NULL, labels=NULL, formatter=identity, ...)

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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
• palette: Either numeric or character. If numeric, selects the nth palette of type type. If character, selects the named palette. Get a complete list of all parameters by running \code{RColorBrewer::display.brewer.all(n=8, exact.n=FALSE)}
• type: Type of scale. One of 'div' (diverging), 'qual' (qualitative, the default), 'seq' (sequential), or 'all' (all). Only used when palette is numeric.
• 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
• formatter: NULL

Returns

This function returns a scale object.

Examples

> dsamp <- diamonds[sample(nrow(diamonds), 1000), ] 
> (d <- qplot(carat, price, data=dsamp, colour=clarity)) 
  
>  
> # Change scale label 
> d + scale_colour_brewer() 
  
> d + scale_colour_brewer("clarity") 
  
> d + scale_colour_brewer(expression(clarity[beta])) 
  
>  
> # Select brewer palette to use, see ?brewer.pal for more details 
> d + scale_colour_brewer(type="seq") 
  
> d + scale_colour_brewer(type="seq", palette=3) 
  
>  
> RColorBrewer::display.brewer.all(n=8, exact.n=FALSE) 
>  
> d + scale_colour_brewer(palette="Blues") 
  
> d + scale_colour_brewer(palette="Set1") 
  
>  
> # scale_fill_brewer works just the same as 
> # scale_colour_brewer but for fill colours 
> ggplot(diamonds, aes(x=price, fill=cut)) + 
+   geom_histogram(position="dodge", binwidth=1000) + 
+   scale_fill_brewer() 
  

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© Hadley Wickham 2010