about plot in r

[lily li]

I want to ask that how to draw a plot with two different y-axis but one x-axis? For example, one y-axis represent one parameter, from bottom to top the lowest to highest, while another y-axis represent another parameter, from top to bottom the lowest to highest. Thanks for your help.

[Ben Bolker]

http://stackoverflow.com/questions/22701606/how-to-plot-bars-and-one-line-on-two-y-axes-in-the-same-chart-with-r-ggplot

and other questions on StackOverflow.

It's not easy to do in ggplot2, because two-axis plots are somewhere
between not recommended and frowned upon in this particular part of
the statistical/quantitative graphics community ...

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[Felix Lankester]

It is possible, but you will need to use base R graphics to do this.

[Brian]

I second that.

another example:

https://rpubs.com/kohske/dual_axis_in_ggplot2

[Konstantinos L. Papageorgiou]

note the top comment :)

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[lily li]

Thanks all for your reply. I also want to know how to make the second y-axis reversed? i.e., from top to bottom is increasing, rather than from bottom to top increasing. Thanks very much.