ggplot2 2.2.0 - Secondary Y axis

[Kousik Kundu]

Hi,
   I am glad to see that ggplot2 2.2.0 introduces the secondary axis on the plot using sec.axis argument:

ggplot(mpg, aes(displ, hwy)) + 
  geom_point() + 
  scale_y_continuous(
    "mpg (US)", 
    sec.axis = sec_axis(~ . * 1.20, name = "mpg (UK)")
  )

At the moment, it only allows a formula in the sec.axis. I was wondering is it possible to use a separate column to use as a secondary axis -

For example, how would I able to plot when -

x axis = mpg$displ
y1 axis = mpg$hwy
y2 axis = mpg$cty

Any help would be highly appreciated. Thank you very much.


Best regards,
Kousik

[Roman Luštrik]

Blog post on the new version is explicitly saying:

You can display a secondary axis that is a one-to-one transformation of the primary axis with the sec.axis argument:

​Basically it's saving user from him or herself as this appears to be the only legitimate use of sec. axis. Secondary axes are frowned upon and should probably not be used (or used sparingly). AFAIK, this feature request has been turned down previously. If you need to present two variables, use two plots/facets.

Cheers,

Roman​

 

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[Sam Albers]

Hi all,

This is not a reply to argue about ggplot2's attitude regarding
secondary y-axes but rather a request for a reference that outlines
the reasons against it as a practice? I am often asked to create
figures with two y-axes and sometimes struggle to come up with a
cohesive argument against the practice. I've come to trust the
opinions on this list but wonder if there is a penultimate reference
or source that talks about the pitfalls on the 2 y-axis approach.

By the way - some REALLY nice changes to the new version of ggplot2

Regards,

Sam

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[Ben Bolker]

There are a few reference links (from Junk Charts and from Stephen
Few) in this StackOverflow answer:
http://stackoverflow.com/questions/6142944/how-can-i-plot-with-2-different-y-axes