在r中用ggplot2更改geom_bar中的条形图颜色 [英] Change bar plot colour in geom_bar with ggplot2 in r

问题描述

  c1 < -  c（10，20， （c 1，c 2，...，c 1，c 1，c 1，c 2，c 4，c 4，c 4，c 5，c 7， c3）
 ggplot（data = df，aes（x = c1 + c2 / 2，y = c3））+ 
 geom_bar（stat =identity，width = c2）+ 
 scale_fill_manual （values = c（＃FF6666））
  

我最终只有灰色条：

如果您想手动更改颜色，请使用 scale_fill_manual（）取决于分类变量。

  c4 = c（A，B，C）
 df = cbind（df，c4）
 ggplot（data = df，aes（x = c1 + c2 / 2，y = c3，fill = c4））+ 
 geom_bar（stat =identity， width = c2）
  

  ggplot（data = df，aes（x = c1 + c2 / 2，y = c3，fill = c4））+ 
 geom_bar scale =identity，width = c2）+ 
 scale_fill_manual（legend，values = c（A=black，B=orange ，C=blue））
  

I have the following in order to bar plot the data frame.

c1 <- c(10, 20, 40)
c2 <- c(3, 5, 7)
c3 <- c(1, 1, 1)
df <- data.frame(c1, c2, c3)
ggplot(data=df, aes(x=c1+c2/2, y=c3)) +
  geom_bar(stat="identity", width=c2) +
  scale_fill_manual(values=c("#FF6666"))

I end up having only grey bars: Grey bars for bar plot

I would like to change the color of the bar. I already tried different scale_fill_manual from http://www.cookbook-r.com/Graphs/Colors_(ggplot2)/ but still have grey bars.

Thank you for your help.

解决方案

If you want all the bars to get the same color (fill), you can easily add it inside geom_bar.

ggplot(data=df, aes(x=c1+c2/2, y=c3)) + 
geom_bar(stat="identity", width=c2, fill = "#FF6666")

Use scale_fill_manual() if you want to manually the change of colors depending of a categorical variable.

c4 = c("A", "B", "C")
df = cbind(df, c4)
ggplot(data=df, aes(x=c1+c2/2, y=c3, fill = c4)) + 
geom_bar(stat="identity", width=c2)

ggplot(data=df, aes(x=c1+c2/2, y=c3, fill = c4)) + 
geom_bar(stat="identity", width=c2) + 
scale_fill_manual("legend", values = c("A" = "black", "B" = "orange", "C" = "blue"))

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