ggplot颜色不会根据组自动着色 [英] ggplot color is not automatically coloring based on group

问题描述

我正在尝试按组'candidate'在图形上创建线.

I'm trying to create to lines on a graph by group 'candidate'

我的代码是 ggplot(grouped_covid，aes(x = newDate，y = positiveIncrease，group = candidate，color =候选人))+ geom_line()

当我设置 color =候选人时，出现错误:未知颜色名称:Clinton，Hillary .我的理解是，它应该只是根据候选项下的分组自动设置颜色，但似乎认为我正在尝试定义颜色.

When I set color = candidate, I get Error: Unknown colour name: Clinton, Hillary. My understanding is that it should just automatically set the color based on the grouping under candidate but it seems think I am trying to define the colors.

推荐答案

@teunbrand被发现.有趣的.您可能以某种方式自愿或多或少地使用了 I()，这使R可以按原样"解释对象.另请参见?I

@teunbrand was spot on. Interesting. You may have somehow more or less voluntarily used I(), which lets R interpret an object "as is". See also ?I

这里是如何转换回普通字符:

Here how to convert back to plain character:

您可以在对ggplot本身的调用中临时执行此操作，或者通过分配(我认为您想这样做)更永久地执行此操作.

You can do that either temporarily in the call to ggplot itself, or more permanently, by assignment (which I think you want to do).

更新在评论中，用户teunbrand指出了S3方法 scale_type.AsIs ，这就是为什么使用"asIs"的原因.对象的工作原理与使用 scale ... identity

update in the comments, user teunbrand pointed to the S3 Method scale_type.AsIs, which is why using an "asIs" object works just like using scale...identity

## this is to reproduce your data structure
iris2 <- iris
iris2$Species <- I(as.character(iris2$Species))

library(ggplot2)
ggplot(iris2, aes(x=Sepal.Length, y = Sepal.Width, color = Species)) + 
  geom_point()
#> Error: Unknown colour name: setosa

#convert withing ggplot
ggplot(iris2, aes(x=Sepal.Length, y = Sepal.Width, color = as.character(Species))) + 
  geom_point()

## convert by assignment
iris2$Species <- as.character(iris2$Species)

ggplot(iris2, aes(x=Sepal.Length, y = Sepal.Width, color = Species)) + 
  geom_point()

^{由 reprex软件包(v0.3.0)创建于2020-07-01 sup>}

^{Created on 2020-07-01 by the reprex package (v0.3.0)}

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