一段時間以來,我一直在努力在我的 ggplot 中創建一個圖例,但我找不到任何有效的答案。
這是我的 ggplot 的精簡版:
ggplot()
geom_smooth(data = mydf1, aes(x, predicted, linetype = 1), method = "lm", linetype = 1, colour = "black")
geom_smooth(data = mydf2, aes(x, predicted, linetype = 2), method = "lm", linetype = 2, colour = "black")
geom_smooth(data = mydf3, aes(x, predicted, linetype = 3), method = "lm", linetype = 3, colour = "black")
theme_classic()

如您所見,我從不同的資料幀(mydf1、mydf2、mydf3)中獲取資料。現在我想手動添加一個圖例,指定實線是“第 1 組”,長虛線是“第 2 組”,虛線線型是“第 3 組”。但是,無論我嘗試什么,我的 ggplot 中都沒有圖例出現。我在 aes() 中包含了線型,嘗試了我能想到的關于 scale_linetype_manual() 的所有方法,并且我一直在四處尋找解決方案,但沒有出現任何圖例。
我錯過了一些明顯的東西嗎?我只需要旁邊的一個小圖例說明不同線型的含義。
我的資料如下:
mydf1 <- data.frame(x = c(seq(-1,1, 0.2)),
predicted = c(-0.27066438, -0.23568714, -0.20070991, -0.16573267, -0.13075543, -0.09577819, -0.06080095, -0.02582371, 0.00915353, 0.04413077, 0.07910801))
mydf2 <- data.frame(x = c(seq(-1,1, 0.2)),
predicted = c(-0.39806988, -0.34348641, -0.28890295, -0.23431948, -0.17973602, -0.12515255, -0.07056909, -0.01598562, 0.03859784, 0.09318131, 0.14776477))
mydf3 <- data.frame(x = c(seq(-1,1, 0.2)),
predicted = c(-0.25520076, -0.22917917, -0.20315758, -0.17713600, -0.15111441, -0.12509282, -0.09907123, -0.07304964, -0.04702806, -0.02100647, 0.00501512))
盡管任何實用的解決方案都會有所幫助,但我并不一定希望將資料幀合并為一個并重做 ggplot。謝謝!
uj5u.com熱心網友回復:
將線線型引入 aes() 并使用 lab() 為圖例提供標題。
ggplot()
geom_smooth(data = mydf1, aes(x, predicted, linetype = "Group 1"), method = "lm", colour = "black")
geom_smooth(data = mydf2, aes(x, predicted, linetype = "Group 2"), method = "lm", colour = "black")
geom_smooth(data = mydf3, aes(x, predicted, linetype = "Group 3"), method = "lm", colour = "black")
labs(linetype="Group")
theme_classic()

uj5u.com熱心網友回復:
這是使用的另一種方法bind_rows:
library(dplyr)
library(ggplot2)
bind_rows(mydf1, mydf2, mydf3) %>%
mutate(group = as.integer(gl(n(), 11, n()))) %>%
ggplot(aes(x, predicted, linetype=factor(group)))
geom_smooth(color="black", method = "lm", se=F)
scale_linetype_discrete(name="group",
breaks=c(1, 2, 3),
labels = c("group1", "group2", "group3"))
theme_classic()

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