使用条件语句更改数据点的颜色 [英] Using Conditional Statements to Change the Color of Data Points

问题描述

我有一个数据集，我用来做一个散点图，我想根据它们的x值，为三个不同区域内的数据点分配三种不同的颜色。

I have a data set, which I have used to make a scatter plot and I would like to assign three different colors to the data points within three different regions, based on their x values.

具有x值的数据点< 3我想出现红色

Data points with x-values < 3 I want to appear red

数据点与x值（3,1549）我想显示为黑色

Data points with x-values (3,1549) I want to appear black

数据点x值> 1549我想显示紫色

Data points with x values >1549 I want to appear purple

这是我的散点图的代码，并完成前两个参数，我如何实现第三个参数，这样最后一个区域的数据点将是紫色的？

Here is my code for the scatterplot and accomplishing the first two parameters, how might I implement the third parameter, so that the last region's data points will be purple?

plot(x, y, xlab="chr X position (Mb)",
           ylab="Diversity",
           pch=16, cex =0.7, 
           col = ifelse(x < 3,'red','black'))    

>

推荐答案

只需使用嵌套 ifelse s：

plot(...., col=ifelse(x < 3, "red", ifelse(x > 1549, "purple", "black")))

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