ggplot2 scatter plot with FIXED LOG axes

Question

I would like to get a R plot with log-scale axes and fixed equal breaks on x and y. I transform the axes into log scale using the following code.

library(ggplot2)
p <- ggplot(cars*1000, aes(x = speed, y = dist)) + geom_point() + 
scale_x_log10(breaks = trans_breaks("log10", function(x) 10^x),
  labels = trans_format("log10", math_format(10^.x))) +
scale_y_log10(breaks = trans_breaks("log10", function(x) 10^x),
                   labels = trans_format("log10", math_format(10^.x)))

Now I want the x and y limits and ticks to be exactly the same from 0 to 10^5. I tried p + coord_fixed() and p + coord_equal() but it does not give me the same scaling.

Set limits inside scale_*_log10 to be the same for both axes, then coord_fixed should work — teofil
– teofil, Commented Nov 26, 2019 at 20:54
Thanks! It doesn't seem to work. Just tried it in the following code and it returns an empty plot: ggplot(cars*1000, aes(x = speed, y = dist)) + geom_point() + scale_x_log10(limits=c(0,10^5),breaks = trans_breaks("log10", function(x) 10^x), labels = trans_format("log10", math_format(10^.x))) + scale_y_log10(limits=c(0,10^5),breaks = trans_breaks("log10", function(x) 10^x), labels = trans_format("log10", math_format(10^.x)))+geom_point() — ahb65
– ahb65, Commented Nov 26, 2019 at 21:16

Zhiqiang Wang · Accepted Answer · 2019-11-26 21:20:36Z

1

library(ggplot2)
library(scales)
p <- ggplot(cars*1000, aes(x = speed, y = dist)) + geom_point() + 
  scale_x_log10(breaks = trans_breaks("log10", function(x) 10^x), 
                labels = trans_format("log10", math_format(10^.x)), 
                limits = c(10^0, 10^5)) +
  scale_y_log10(breaks = trans_breaks("log10", function(x) 10^x),
                labels = trans_format("log10", math_format(10^.x)),
                limits = c(10^0, 10^5)) 
p

answered Nov 26, 2019 at 21:20

Zhiqiang Wang

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