ggplot并排geom_bar（） [英] ggplot side by side geom_bar()

问题描述

我想用这个数据框的geom_bar（）创建一个并排的barplot，

I want to create a side by side barplot using geom_bar() of this data frame,

> dfp1
   value   percent1   percent
1 (18,29] 0.20909091 0.4545455
2 (29,40] 0.23478261 0.5431034
3 (40,51] 0.15492958 0.3661972
4 (51,62] 0.10119048 0.1726190
5 (62,95] 0.05660377 0.1194969

我试过使用这段代码，

With values on the x-axis and the percents as the side by side barplots. I have tried using this code,

p = ggplot(dfp1, aes(x = value, y= c(percent, percent1)), xlab="Age Group")
p = p + geom_bar(stat="identity", width=.5)  

但是，我得到以下错误：错误：美学必须是长度为1或与dataProblems：value的长度相同。 ％和percent1的长度与value相同，所以我很困惑。感谢您的帮助。

However, I get this error: Error: Aesthetics must either be length one, or the same length as the dataProblems:value. My percent and percent1 are the same length as value, so I am confused. Thanks for the help.

value 解析数据code> melt ，它会创建另一个名为 value 默认情况下，所以你需要重命名它（我称之为百分比）。然后，使用 fill 绘制新数据集，以便将数据分成组，并且 position =dodge （而不是彼此之间）

You will need to melt your data first over value. It will create another variable called value by default, so you will need to renames it (I called it percent). Then, plot the new data set using fill in order to separate the data into groups, and position = "dodge" in order put the bars side by side (instead of on top of each other)

library(reshape2)
library(ggplot2)
dfp1 <- melt(dfp1)
names(dfp1)[3] <- "percent"
ggplot(dfp1, aes(x = value, y= percent, fill = variable), xlab="Age Group") +
geom_bar(stat="identity", width=.5, position = "dodge")  

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