R语言内置颜色

R语言有大量的内置色彩供我们使用，具体可以使用colors()提取色彩名称，
colors(F)不去重有657种，colors(T)去重有502种，此处绘制去重的色彩图

column <- 8
color <- colors(T)
index <- seq(length(color))
row <- ceiling(length(color)/column)

xleft <-rep(0:(column - 1)/column,row)[index]
ybottom <-  sort(rep(0:(row - 1)/row,column),decreasing=T)[index]
xright <-  rep(1:column/column,row)[index]
ytop <-  sort(rep(1:row/row,column),decreasing=T)[index]

par(mar=c(0,0,0,0))
plot(x=0, y=0, type = "n", xlim = c(0, 1), ylim = c(0, 1), axes = FALSE, xlab = "", ylab = "")
rect(xleft,ybottom,xright,ytop,
     border = "grey80",
     col=color)
text(x=xleft+0.5/column, 
     y=ybottom+0.5/row,
     labels = paste0(index,"-",color), 
     col = "grey20",
     cex=1.5)

代码参考自：https://blog.csdn.net/weixin_44331529/article/details/85369232