coord_trans {ggplot2} | R Documentation |
Transformed cartesian coordinate system
coord_trans(xtrans="identity", ytrans="identity", ...)
xtrans |
NULL |
ytrans |
NULL |
... |
ignored |
This page describes coord_trans, see layer
and qplot
for how to create a complete plot from individual components.
A layer
Hadley Wickham, http://had.co.nz/
## Not run: # 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") ## End(Not run)