geom_step

geom_step(mapping=NULL, data=NULL, stat="identity", position="identity", direction="hv", ...)

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Aesthetics

The following aesthetics can be used with geom_step. Aesthetics are mapped to variables in the data with the aes function: geom_step(aes(x = var)). Note that you do not need quotes around the variable name.

Scales control how the variable is mapped to the aesthetic and are listed after each aesthetic.

Layers are divided into groups by the group aesthetic. By default this is set to the interaction of all categorical variables present in the plot.

Parameters

Parameters control the appearance of the geom. 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.

• direction: direction of stairs: 'vh' for vertical then horizontal, or 'hv' for horizontal then vertical

Returns

This function returns a layer object.

Examples

> # Simple quantiles/ECDF from examples(plot) 
> x <- sort(rnorm(47)) 
> qplot(seq_along(x), x, geom="step") 
  
>  
> # Steps go horizontally, then vertically (default) 
> qplot(seq_along(x), x, geom="step", direction = "hv") 
  
> plot(x, type = "s") 
> # Steps go vertically, then horizontally 
> qplot(seq_along(x), x, geom="step", direction = "vh") 
  
> plot(x, type = "S") 
>  
> # Also works with other aesthetics 
> df <- data.frame( 
+   x = sort(rnorm(50)), 
+   trt = sample(c("a", "b"), 50, rep = T) 
+ ) 
> qplot(seq_along(x), x, data = df, geom="step", colour = trt) 
  

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© Hadley Wickham 2010