Graphics Reference
In-Depth Information
Figure 8-30. Top: a stock chart with a linear x-axis and log y-axis; bottom: with manual breaks
Adding Ticks for a Logarithmic Axis
Problem
You want to add tick marks with diminishing spacing for a logarithmic axis.
Solution
Use annotation_logticks() ( Figure 8-31 ):
library(MASS) # For the data set
library(scales) # For the trans and format functions
ggplot(Animals, aes(x = body, y = brain, label = rownames(Animals))) +
geom_text(size = 3 ) +
annotation_logticks() +
scale_x_log10(breaks = trans_breaks( "log10" , function
function (x) 10 ^ x),
labels = trans_format( "log10" , math_format( 10 ^ . x))) +
scale_y_log10(breaks = trans_breaks( "log10" , function
function (x) 10 ^ x),
labels = trans_format( "log10" , math_format( 10 ^ . x)))
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