The Cartesian coordinate system is the most familiar, and common, type of coordinate system. Setting limits on the coordinate system will zoom the plot (like you're looking at it with a magnifying glass), and will not change the underlying data like setting limits on a scale will.
coord_cartesian(xlim = NULL, ylim = NULL, wise = NULL)
- limits for the x axis
- limits for the y axis
- deprecated in 0.9.1
# There are two ways of zooming the plot display: with scales or # with coordinate systems. They work in two rather different ways. (p <- qplot(disp, wt, data=mtcars) + geom_smooth()) # Setting the limits on a scale will throw away all data that's not # inside these limits. This is equivalent to plotting a subset of # the original data p + scale_x_continuous(limits = c(325, 500)) # Setting the limits on the coordinate system performs a visual zoom # the data is unchanged, and we just view a small portion of the original # plot. See how the axis labels are the same as the original data, and # the smooth continue past the points visible on this plot. p + coord_cartesian(xlim = c(325, 500)) # You can see the same thing with this 2d histogram (d <- ggplot(diamonds, aes(carat, price)) + stat_bin2d(bins = 25, colour="grey50")) # When zooming the scale, the we get 25 new bins that are the same # size on the plot, but represent smaller regions of the data space d + scale_x_continuous(limits = c(0, 2)) # When zooming the coordinate system, we see a subset of original 50 bins, # displayed bigger d + coord_cartesian(xlim = c(0, 2))