ggplot条形图中y轴的顺序错误

时间:2014-08-01 13:09:35

标签: r ggplot2

在此条形图中,条形图不会以相同方式缩放。因此y轴没有正确排序(157> 1342.6)。我该如何解决这个问题?

library(reshape)
library(ggplot2)

data <- matrix(1:9, 3, 3)
colnames(data) <- c("approach", "best", "worst")
data[1,] <- c("a", 1.8, 157.0)
data[2,] <- c("b", 592.3, 1342.6)
data[3,] <- c("c", 613.1, 3744.1)
data <- as.data.frame(data)
data <- melt(data, id="approach")

p <- ggplot(data, aes(x=approach, y=value, fill=variable)) +
  geom_bar(position="dodge", stat="identity")
p

plot

提前致谢。

1 个答案:

答案 0 :(得分:4)

您需要在值列中包含数值,目前您有因素:

library(reshape)
library(ggplot2)

data <- matrix(1:9, 3, 3)
colnames(data) <- c("approach", "best", "worst")
data[1,] <- c("a", 1.8, 157.0)
data[2,] <- c("b", 592.3, 1342.6)
data[3,] <- c("c", 613.1, 3744.1)
data <- as.data.frame(data)
data <- melt(data, id="approach")

data$value = as.double(levels(data$value))[data$value] # <-- converting 

p <- ggplot(data, aes(x=approach, y=value, fill=variable)) +
  geom_bar(position="dodge", stat="identity")
p

enter image description here