third Y-axis

[Nasim Fazel]

Hi, 

Could someone help me with an example to add a third Y-axis to a plot?

Bests, 

Nasim

[Brandon Hurr]

3 Y-axes are impossible with base ggplot2. If you just want two, you can do that as long as they are related (temp in F and C) using sec.axis since 2.2.0: 

https://blog.rstudio.org/2016/09/30/ggplot2-2-2-0-coming-soon/

Kohske put together this before sec.axis was introduced. You might be able to use sec.axis and use grid to add a 3rd y-axis, but having three seems really really like a bad idea. 

https://rpubs.com/kohske/dual_axis_in_ggplot2

See Hadley's response here as to why more than one axis is a bad idea:

https://stackoverflow.com/questions/3099219/plot-with-2-y-axes-one-y-axis-on-the-left-and-another-y-axis-on-the-right

If you want further help, you'll need to justify 3 axes a bit and also provide a minimal reproducible example:

https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example

HTH, 

B

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