为什么ggplot在指定其他人时使用默认颜色？ [英] Why is ggplot using default colors when others are specified?

问题描述

我试图让ggplot2显示直方图的一行，作为与其他颜色不同的颜色。在这我已经成功了;但是，ggplot在指定不同的集合时使用默认颜色。我确信我的代码有错误，但我无法确定它在哪里。数据和代码如下：

创建数据

  library（ （round（runif（100000，min = 1.275，max = 1.725），digits = 2））$ b（set_seed（71185）
 dist.x<  -  as.data.frame $ b colnames（dist.x）<  - 'sim_con'
  

开始直方图

  ggplot（dist.x，aes（x = sim_con））+ 
 geom_histogram（color =black，aes（fill = ifelse （dist.x $ sim_con == 1.55，darkgreen，firebrick）），binwidth = .01）+ 
 theme（legend.position =none）
  

结果如下图：

我不想使用默认颜色，而是想使用'darkgreen'和'firebrick'。代码中的错误在哪里？感谢您提供的任何帮助。

解决方案

我不认为您可以在 AES ;您需要在 scale_fill_manual 中执行此操作，如下例所示：

  ggplot（dist.x，aes（x = sim_con））+ 
 geom_histogram（color =black，binwidth = .01，aes（fill =（sim_con == 1.55）））+ 
 scale_fill_manual （values = c（'TRUE'='darkgreen'，'FALSE'='firebrick'））+ 
 theme（legend.position =none）
  pre> 
 
 
  
 
I am trying to have ggplot2 show one line of a histogram as a different color than the rest.  In this I have been successful; however, ggplot is using the default colors when a different set are specified.  I am sure there is an error in my code, but I am unable to determine where it is.  The data and code are below:

create data

library(ggplot2)
set.seed(71185)
dist.x <- as.data.frame(round(runif(100000, min= 1.275, max= 1.725), digits=2))
colnames(dist.x) <- 'sim_con'


start histogram

ggplot(dist.x, aes(x = sim_con)) +
geom_histogram(colour = "black", aes(fill = ifelse(dist.x$sim_con==1.55, "darkgreen", "firebrick")), binwidth = .01) +
theme(legend.position="none")
Which results in the following image:


I do not want to use the default colors, but instead want to use 'darkgreen' and 'firebrick'.  Where is the error in the code?  Thanks for any help you can provide.
解决方案
I don't think you can explicitly set colors in aes; you need to do it in scale_fill_manual, as in the example below:
ggplot(dist.x, aes(x = sim_con)) +
  geom_histogram(colour = "black", binwidth = .01,aes(fill=(sim_con==1.55))) + 
  scale_fill_manual(values=c('TRUE'='darkgreen','FALSE'='firebrick')) +
  theme(legend.position="none")


                        
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