coord_trans

coord_trans(xtrans="identity", ytrans="identity", ...)

Transformed cartesian coordinate system

This page describes coord_trans, see layer and qplot for how to create a complete plot from individual components.

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Parameters

Parameters control the appearance of the coord. 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.

Returns

This function returns a coordinate system object.

Examples

> # See ?geom_boxplot for other examples 
>  
> # Three ways of doing transformating in ggplot: 
> #  * by transforming the data 
> qplot(log10(carat), log10(price), data=diamonds) 
  
> #  * by transforming the scales 
> qplot(carat, price, data=diamonds, log="xy") 
  
> qplot(carat, price, data=diamonds) + scale_x_log10() + scale_y_log10() 
  
> #  * by transforming the coordinate system: 
> qplot(carat, price, data=diamonds) + coord_trans(x = "log10", y = "log10") 
  
>  
> # The difference between transforming the scales and 
> # transforming the coordinate system is that scale 
> # transformation occurs BEFORE statistics, and coordinate 
> # transformation afterwards.  Coordinate transformation also 
> # changes the shape of geoms: 
>  
> d <- subset(diamonds, carat > 0.5) 
> qplot(carat, price, data = d, log="xy") + 
+   geom_smooth(method="lm") 
  
> qplot(carat, price, data = d) + 
+   geom_smooth(method="lm") + 
+   coord_trans(x = "log10", y = "log10") 
  
>  
> # Here I used a subset of diamonds so that the smoothed line didn't 
> # drop below zero, which obviously causes problems on the log-transformed 
> # scale 
>  
> # With a combination of scale and coordinate transformation, it's 
> # possible to do back-transformations: 
> qplot(carat, price, data=diamonds, log="xy") + 
+   geom_smooth(method="lm") + 
+   coord_trans(x="pow10", y="pow10") 
  
> # cf. 
> qplot(carat, price, data=diamonds) + geom_smooth(method = "lm")

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