添加图例以手动添加使用ggplot的行 [英] Add legend to manually added lines using ggplot

问题描述

我正在使用 ggplot 添加3个手动添加行的相应图例。我的代码如下：

  library（ggplot2）
 df = data.frame（error = c（0.0832544999， 0.0226680026，0.0082536264，0.0049199958，0.0003917755，0.0003859976，0.0003888253，0.0003953918，0.0003958398），sDev = c（8.188111e-03,2.976161e-03,1.466221e-03,2.141425e-03,2.126976e-05,2.1339364e-05 ，2.169059e-05,2.629895e-05,2.745938e-05））
 
最低< -  6 
 best.model < -  5 
 
 gplot <  -  ggplot（df，aes（x = 1：length（error），y = error））+ 
 scale_x_continuous（breaks = seq_along（df $ error））+ 
 geom_point（size = 3） + 
 geom_line（）+ 
 geom_errorbar（data = df，aes（x = 1：length（error），ymin = error  -  sDev，ymax = error + sDev），
 width = 0.1 ）+ 
 geom_hline（data = df，aes（yintercept = error [minimum] + sDev [minimum]），linetype =dashed）+ 
 geom_vline（xintercept = minimum，linetype =dotted， color =red，size = 1）+ 
 geom_vline（xintercept = best.model，linetype =dotted，color =blue，size = 1）+ 
 theme_gray（base_size = 18）+ 
 theme（axis.text = element_text（ color =black））+ 
 labs（x =＃参数，fontface =bold）+ 
实验室（y =CV错误）+ 
实验室=交叉验证错误曲线）
  

我想知道如何添加3个虚线的图例黑色，红色和蓝色。

非常感谢！

解决方案

诀窍是使用适当的映射：

  gplot < -  ggplot（df，aes（x = 1：length （错误），y =错误））+ 
 scale_x_continuous（breaks = seq_along（df $ error））+ 
 geom_point（size = 3）+ 
 geom_line（）+ 
 geom_errorbar （data = df，aes（x = 1：长度（错误） ，ymin = error -sDev，ymax = error + sDev），
 width = 0.1）+ 
 geom_hline（data = df，aes（yintercept = error [minimum] + sDev [minimum]，linetype = a，color =a））+ 
 geom_vline（data = data.frame（type =b，col =b，minimum = minimum），
 aes（linetype = type， color = col，xintercept = minimum），size = 1，show_guide = TRUE）+ 
 geom_vline（data = data.frame（type =b，col =b，best.model = best.model） ，
 aes（linetype =c，color =c，xintercept = best.model），size = 1，show_guide = TRUE）+ 
 scale_colour_manual（name =Legend，values = c （a=black，b=red，c=blue））+ 
 scale_linetype_manual（name =Legend，values = c（a=dashed ，b=点，c=点））+ 
 theme_gray（base_size = 18）+ 
主题（axis.text = element_text（color =black），
 legend.key.height = grid :: unit（0.1，npc））+ 
 labs（x =＃参数，fontface =bold）+ 
 labs（y =CV错误）+ 
实验室（标题=交叉验证错误曲线）
  

I'm trying to add the corresponding legend for 3 manually added lines using ggplot. My code is the following:

library(ggplot2)
df = data.frame(error = c(0.0832544999, 0.0226680026, 0.0082536264, 0.0049199958, 0.0003917755, 0.0003859976, 0.0003888253, 0.0003953918, 0.0003958398), sDev = c(8.188111e-03, 2.976161e-03, 1.466221e-03, 2.141425e-03, 2.126976e-05, 2.139364e-05, 2.169059e-05, 2.629895e-05, 2.745938e-05))

minimum <- 6
best.model <- 5

gplot <- ggplot(df, aes(x=1:length(error), y=error)) +
             scale_x_continuous(breaks = seq_along(df$error)) +
             geom_point(size = 3) +
             geom_line() +
             geom_errorbar(data = df, aes(x = 1:length(error), ymin = error - sDev, ymax = error + sDev), 
                           width = 0.1) + 
             geom_hline(data = df, aes(yintercept = error[minimum] + sDev[minimum]), linetype = "dashed") +
             geom_vline(xintercept = minimum, linetype = "dotted", color = "red", size = 1) +
             geom_vline(xintercept = best.model, linetype = "dotted", color = "blue", size = 1) +
             theme_gray(base_size = 18) + 
             theme(axis.text = element_text(color = "black")) +
             labs(x = "# of parameters", fontface = "bold") + 
             labs(y = "CV error") +
             labs(title = "Cross-validation error curve")

I'd like to know how to add the legends for the 3 dotted lines in black, red, and blue.

Thanks a lot in advance!

解决方案

The trick is to use appropriate mapping:

gplot <- ggplot(df, aes(x=1:length(error), y=error)) +
  scale_x_continuous(breaks = seq_along(df$error)) +
  geom_point(size = 3) +
  geom_line() +
  geom_errorbar(data = df, aes(x = 1:length(error), ymin = error - sDev, ymax = error + sDev), 
                width = 0.1) + 
  geom_hline(data = df, aes(yintercept = error[minimum] + sDev[minimum], linetype="a", colour="a")) +
  geom_vline(data= data.frame(type="b", col="b", minimum=minimum), 
             aes(linetype=type, colour=col, xintercept = minimum), size = 1, show_guide = TRUE) +
  geom_vline(data= data.frame(type="b", col="b", best.model=best.model),
             aes(linetype="c", colour="c", xintercept = best.model), size = 1, show_guide = TRUE) +
  scale_colour_manual(name="Legend", values = c("a" = "black", "b" = "red", "c" = "blue")) +
  scale_linetype_manual(name="Legend", values = c("a" = "dashed", "b" = "dotted", "c" = "dotted")) +
  theme_gray(base_size = 18) + 
  theme(axis.text = element_text(color = "black"),
        legend.key.height  = grid::unit(0.1, "npc")) +
  labs(x = "# of parameters", fontface = "bold") + 
  labs(y = "CV error") +
  labs(title = "Cross-validation error curve")

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