R可视化：连续性变量作为ggplot 颜色映射

连续性变量作为color映射。

library(ggplot2)
library(RColorBrewer)

set.seed(1)
df <- data.frame(x = runif(100), y = runif(100), z = runif(100))
cols <- rev(brewer.pal(11, 'RdYlBu'))

ggplot(df, aes(x, y, colour = z)) + 
        geom_point()+
        scale_colour_gradientn(colours = cols)