如何使用ggplot将两个不同比例的y轴放在绘图的同一侧？

Question

I have three variables (Precipitation, Temperature and PAR Radiation) with different scales. I'm trying to plot these three variables together and I put the daily sum of precipitation represented by a barplot on the left side y axis and the daily average of temperature on the right side y axis. I'd like to put another y axis on the right side, with another scale, in order to represent the daily average of PAR radiation, but I can't. I'm using the ggplot package, because it is useful for other reasons.

I'm trying to reach something similar as in the pic:

Answer 1

A discussion of this topic can be found here:

ggplot with 2 y axes on each side and different scales

A workaround solution can be found here:

https://rpubs.com/MarkusLoew/226759

Answer 2

您可以使用 Sandard R 包http://evolvingspaces.blogspot.com/2011/05/multiple-y-axis-in-r-plot.html