这可以通过以下方式实现:
- 按降序排列 df by cat,使 A 和 B 排在最后
- 映射条件
cat %in% c("A", "B")
在线型上
- 使用以下命令将线型设置为 TRUE 和 FALSE
scale_linetype_manual
- 使用摆脱线型图例
guides
library(reshape2)
library(ggplot2)
df = data.frame(cat = LETTERS[1:6], VAR1 = runif(6), VAR2 = runif(6), VAR3 = runif(6), VAR4 = runif(6))
df_melted = melt(df, id.vars = 'cat')
df_melted <- arrange(df_melted, desc(cat))
#> Error in arrange(df_melted, desc(cat)): could not find function "arrange"
ggplot(df_melted, aes(x = variable, y = value)) +
geom_line(aes(color = cat, group = cat, linetype = cat %in% c("A", "B"))) +
scale_linetype_manual(values = c("TRUE" = "solid", "FALSE" = "dotted")) +
guides(linetype = FALSE)
EDIT实现结果的另一种方法可能如下所示。这里我也使用同样的图案来调整大小。我喜欢这种方法的原因是我们不需要条件,并且只有一个图例:
library(reshape2)
library(ggplot2)
library(dplyr)
df = data.frame(cat = LETTERS[1:6], VAR1 = runif(6), VAR2 = runif(6), VAR3 = runif(6), VAR4 = runif(6))
df_melted = melt(df, id.vars = 'cat')
df_melted <- arrange(df_melted, desc(cat))
ggplot(df_melted, aes(x = variable, y = value, group = cat)) +
geom_line(aes(color = cat, linetype = cat, size = cat)) +
scale_linetype_manual(values = c(A = "solid", B = "solid", rep("dotted", 4))) +
scale_size_manual(values = c(A = 1, B = 1, rep(.5, 4)))