# RColorBrewer 包中所有调色板颜色的演示
library(RColorBrewer)
layout(matrix(1:3, 3), heights = c(2, 1, 1))
par(mar = c(0, 4, 0, 0))
display.brewer.all(type = "seq") # 连续型:18 种
display.brewer.all(type = "div") # 极端化:9 种
display.brewer.all(type = "qual") # 离散型:8 种
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