设置单个数据点的颜色 [英] Setting the color for an individual data point

问题描述

如何在R的散点图中为单个数据点设置颜色?

How can I set the colour for a single data point in a scatter plot in R?

我正在使用plot

推荐答案

要扩展@Dirk Eddelbuettel的答案，可以在对plot的调用中对col使用任何函数.例如，这会将x==3点涂成红色，而其他所有点都涂成黑色:

To expand on @Dirk Eddelbuettel's answer, you can use any function for col in the call to plot. For instance, this colors the x==3 point red, leaving all others black:

x <- 1:5
plot(x, x, col=ifelse(x==3, "red", "black"))

点字符pch，字符扩展cex等也是如此

Same goes for point character pch, character expansion cex, etc.

plot(x, x, col=ifelse(x==3, "red", "black"),
     pch=ifelse(x==3, 19, 1), cex=ifelse(x==3, 2, 1))

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