Transform y axis in bar plot using scale_y_log10()

Question

Using the data.frame below, I want to have a bar plot with y axis log transformed.

I got this plot

using this code

ggplot(df, aes(x=         


        

Answer 1

If you need bars flipped, maybe calculate your own log10(y), see example:

library(ggplot2)
library(dplyr)

# make your own log10
dfPlot <- df %>% 
  mutate(ymin = -log10(ymin),
         ymax = -log10(ymax),
         ymean = -log10(ymean))

# then plot
ggplot(dfPlot, aes(x = id, y = ymean, fill = var, group = var)) +
  geom_bar(position = "dodge", stat = "identity",
           width = 0.7,
           size = 0.9)+
  geom_errorbar(aes(ymin = ymin, ymax = ymax),
                size = 0.25,   
                width = 0.07,
                position = position_dodge(0.7)) +
  scale_y_continuous(name = expression(-log[10](italic(ymean)))) + 
  theme_bw()