如何更改ggplot2中的图例线型?

问题描述：

我有一个简单的图，其中无法使用scale_linetype_manual根据图中的线型更改图例中的线型.

I have this simple plot where I cannot change the linetype in the legend according to the linetype in the plot using scale_linetype_manual.

生成图的代码是:

library(ggplot2)

x_1 <- rep(0:6, each = 2)
pdf_1 <- c(0,0.05,0.05,0.1,0.1,0.15,0.15,0.3,0.3,0.25,0.25,0.15,0.15,0)

x_2 <- rep(3:9, each = 2)
pdf_2 <- c(0,0.05,0.05,0.1,0.1,0.15,0.15,0.3,0.3,0.25,0.25,0.15,0.15,0)

data_1 <- data.frame(x_1, pdf_1,x_2,pdf_2)

ggplot()+
  geom_line(data=data_1,aes(x=x_1, y=pdf_1, color="Forecaster_1"),linetype='solid',size=1)+
  geom_line(data=data_1,aes(x=x_2, y=pdf_2, color="Forecaster_2"),linetype='dashed',size=1)+
  labs(x = "x") +
  labs(y = "PDF") +
  scale_colour_manual(values = c('Forecaster_1' = 'cornflowerblue', 'Forecaster_2' = 'coral2')) +
  scale_linetype_manual(values = c('Forecaster_1' = 'solid', 'Forecaster_2' = 'dashed'))

我希望有人帮我解决这个问题.

I would appreciate someone help me with this.

答

如果将线型映射为aethetic，然后确保两个指南都使用相同的名称，那会更好.例如

It would be better if you mapped the line type as an aethetic and then make sure you use the same name for both guides. For example

ggplot()+
  geom_line(data=data_1,aes(x=x_1, y=pdf_1, color="Forecaster_1", linetype='Forecaster_1'),size=1)+
  geom_line(data=data_1,aes(x=x_2, y=pdf_2, color="Forecaster_2", linetype='Forecaster_2'),size=1)+
  labs(x = "x") +
  labs(y = "PDF") +
  scale_colour_manual("Line", values = c('Forecaster_1' = 'cornflowerblue', 'Forecaster_2' = 'coral2')) +
  scale_linetype_manual("Line", values = c('Forecaster_1' = 'solid', 'Forecaster_2' = 'dashed'))

如何更改ggplot2中的图例线型?

相关推荐