How to use sec_axis() for discrete data in ggplot2 R?
问题 I have discreet data that looks like this: height <- c(1,2,3,4,5,6,7,8) weight <- c(100,200,300,400,500,600,700,800) person <- c("Jack","Jim","Jill","Tess","Jack","Jim","Jill","Tess") set <- c(1,1,1,1,2,2,2,2) dat <- data.frame(set,person,height,weight) I'm trying to plot a graph with same x-axis(person), and 2 different y-axis (weight and height). All the examples, I find is trying to plot the secondary axis (sec_axis), or discreet data using base plots. Is there an easy way to use sec_axis