Plot negative values in logarithmic scale with ggplot 2

Question

I need to plot with ggplot2 package in R a graph with some negative values using an x logarithmic scale.

For example I want to plot these points using an x logarithmi

Answer 1

For this, I find the pseudolog10_trans transformation from the ggallin package to be very helpful, as it can accomodate situations with both positive and negative numbers on a log scale. E.g.

library(ggplot2)
library(ggallin)

x <- c(-1,-10,-100, 1, 10, 100)
y <- c(1,2,3, 1,2,3)

df = data.frame(x = x, y = y)

My_Plot = ggplot(
    df, 
    aes(x=x, y=y)) + 
    geom_point() + 
    scale_x_continuous(trans = pseudolog10_trans)

My_Plot