什么颜色列必须是分类的，而不是 R 中的数字意味着什么？

Question

library(ggplot2)

library(GGally)

ggpairs(diab, aes(color=diabetes, alpha=0.75), lower=list(continuous="smooth"))+ theme_bw()+

labs(title="Correlation Plot of Variance(diabetes)")+

theme(plot.title=element_text(face='bold',color='black',hjust=0.5,size=12))



Error in ggally_statistic(data = data, mapping = mapping, na.rm = na.rm,  : 
  `mapping` color column must be categorical, not numeric

Answer 1

In order to assign colors, you must give categories to ggplot . A numerical vector can have infinite values, so the function doesn't know how to assign colors to it, thus you need a factor . You can transform diabetes to a factor by doing:

diab$diabetes = as.factor(diab$diabetes)