CODEWITHSUNDEEP
rggplot2histogram
kittenlee
kittenlee

Reputation: 3

ggplot transform y axis histogram

I have this line of code:

ggplot(data=AB2, aes(AB2$logbm)) + 
  geom_histogram(breaks=seq(-1.5, 2.5, by=((max(AB2$logbm)-min(AB2$logbm))/7)))

And I have problem in trying to transform the unit of y axis - first I need to log it, with:

scale_y_log10()

After that I want to divide all the values by 60, then multiple by 1.25. However with the above code, I dont seem to be able to adjust it with simply adding: 60*1.25 after the command.

Is there a way to tell ggplot to do it??

Cheers,

Upvotes: 0

Views: 796

Answers (2)

Chris
Chris

Reputation: 6372

You can also define your own trans using the scales package. Normally:

scale_y_continuous(trans = "log10")

With transformation:

scale_y_continuous(trans = scales::trans_new("lognew", 
                                             transform = function(x){log10(x)*1.25/60},
                                             inverse = function(x){10^(x*60/1.25)})
                                             )

Upvotes: 3

Richard Telford
Richard Telford

Reputation: 9923

You can do this, though not sure why you would want to, by using ..count.. in the aes

ggplot(AB2, aes(x = logbm)) +
  scale_y_log10() +
  geom_histogram(aes(y = ..count.. * 1.25 / 60))

NB no need to reference the data.frame in the aes.

Upvotes: 2

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