How to set minor grid line breaks to log2 cycles

[Hefin Rhys]

Hi all, say I construct a plot using the following:

library(ggplot2)

myData <- data.frame("xVar" = c(1, 2, 4, 8, 16, 32, 64, 128, 256),
                     "yVar" = 1:9)

ggplot(data = myData, aes(x = xVar, y = yVar)) +
  geom_line() +
  scale_x_continuous(trans = "log2")

I have intentionally plotted the original values on a log2-transformed x axis, rather than transform the values themselves so as to preserve some interpretability of the values. To make it more immediately obvious that the x axis is transformed, I would like to set the minor grid line breaks to show the cycles of each decade, as shown here: https://msu.edu/course/fsc/441/6cycle.gif

Is there a way of doing this for both this log2 transformation, and for log10 transformations also?

Many thanks
Hefin

[Hadley Wickham]

Trying supplying the minor_breaks parameter.

Hadley

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