Reversing an axis drops minor_breaks

[markpayneatwork]

Hi,

Reversing an axis in ggplot drops the minor_breaks. Panel a) shows how the "normal" plot, with minor_breaks being plotted, but after reversing the yaxis using coord_cartesian() they are dropped (Panel b). Similar results are also seen when working with scale_y_continuous() instead of scale_y_log10().

Is this a bug? Or a misunderstanding of how to reverse a (log) axis in ggplot on my part?

Thanks.

Mark

library(ggplot2)
library(patchwork)

dat <- data.frame(x=1:100)
dat$y <- dat$x^2

p1 <- ggplot(dat,aes(x,y))+
  geom_line()+
  scale_y_log10(minor_breaks = 10^seq(0,4,by=0.1))+
  labs(title="a) Normal")
p2 <- p1 + 
  coord_cartesian(ylim=c(10000,1))+
  labs(title="b) Reversing with coord_cartesian\n drops minor_breaks")

wrap_plots(p1,p2)

^{Created on 2021-06-17 by the reprex package (v0.3.0)}

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[thomasp85]

@clauswilke /@paleolimbot can you remember what we ended up deciding for this idiom (i.e. flipping axes by flipping their limits in the coord). Is this a bug or simply undefined behaviour?

[clauswilke]

There's an issue somewhere with a long discussion about reversing axes, but I think this particular problem is different. The minor breaks shouldn't disappear in any scenario.

[thomasp85]

@paleolimbot while you are taking a look at Coords and axes? 🙂