我有一个 3 列矩阵；绘图由基于第 1 列和第 2 列值的点绘制，但基于第 2 列（6 个不同组）着色。我可以成功绘制所有点，但是，分配了紫色的最后一个绘图组（组 6）掩盖了其他组的绘图。有没有办法让情节更加透明？
s <- read.table("/.../parse-output.txt", sep="\t")
dim(s)
[1] 67124 3
x <- s[,1]
y <- s[,2]
z <- s[,3]
cols <- cut(z, 6, labels = c("pink", "red", "yellow", "blue", "green", "purple"))
plot(x, y, main= "Fragment recruitment plot - FR-HIT", ylab = "Percent identity", xlab = "Base pair position", col = as.character(cols), pch=16)
否则，你有功能alpha包装内scales您可以在其中直接输入颜色向量（即使它们是示例中的因素）：
library(scales)
cols <- cut(z, 6, labels = c("pink", "red", "yellow", "blue", "green", "purple"))
plot(x, y, main= "Fragment recruitment plot - FR-HIT",
ylab = "Percent identity", xlab = "Base pair position",
col = alpha(cols, 0.4), pch=16)
# For an alpha of 0.4, i. e. an opacity of 40%.
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