在R中使用向量进行条件Barchart着色 [英] Conditional Barchart coloring with a vector in R

问题描述

我正在尝试创建一个带有负值和正值的简单条形图，并将我的输入作为矢量.我希望条形图以红色显示正值，以蓝色显示负值.我知道这个问题很简单，但似乎无法解决.

I am attempting to create a simple barplot with both negative and positive values with my input as a vector. I would like the barplot to display the positive values colored in red and the negative values colored in blue. I understand this problem is simple, but I cannot seem to figure it out.

这是我的载体:

x <- (1.9230769,  1.2961538,  0.2576923, -1.5500000, -1.3192308, 
0.2192308,  1.8346154, 1.6038462,  2.5653846,  4.1423077)

我尝试了以下代码:

barplot(x, ylim=c(-8,8), if(x>0) {col="red"} else {col="blue"})

但是我不断收到错误消息

but I keep getting an error that says

在if(x> 0){时:条件的长度> 1，并且只有第一个元素将被使用"

"In if (x > 0) { : the condition has length > 1 and only the first element will be used"

如何理解整个矢量并有条件地用红色和蓝色绘制它?

How can I get it to understand to run through the entire vector and plot it conditionally with red and blue?

谢谢

亚当

推荐答案

使用

barplot(x, ylim=c(-8,8), col=ifelse(x>0,"red","blue"))

col = 需要一个长度与 x 相同的向量(否则它将循环使用值).而且，您实际上不能有条件地指定类似的参数.与仅运行一次的 if 不同， ifelse 将使向量成为所需的对象.

col= expects a vector with the same length as x (or it will recycle values). And you can't really conditionally specify parameters like that. The ifelse will make the vector as desired unlike if which only runs once.

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