ggplot中的两行X轴标签 [英] Two lines of X axis labels in ggplot

问题描述

我想在ggplot中制作两行X轴标签.

I want to make two lines of X axis labels in ggplot.

在此绘图中，我想在每个指定年份的下方添加一行标签.

In this plot, I want to add one more line of label below each specified year. Something like

1990 1995 2000 2005 2010 cold warm warm cold warm

1990 1995 2000 2005 2010 cold warm warm cold warm

这是我制作这张图的代码

This is my code for making this plot

ggplot(subset(dat, countryid %in% c("1")),  aes(date, 
nonpartisan))+geom_line(aes(color=countryid), color="dodgerblue1", 
size=1.4)+geom_line(aes(date, reshuffle), color="gray")+ theme_bw()

是否可以通过专门为标签创建一列来增加一行标签?

Is there any way to make one more line of label by creating a column specifically for the labels?

谢谢！

推荐答案

您只需通过scale_x_continuous(或scale_x_date，如果它实际上是Date格式)添加自定义标签.

You can just add custom labels via scale_x_continuous (or scale_x_date, if it is actually in Date format).

ggplot(subset(dat, countryid %in% c("1")),  aes(date, nonpartisan)) +
  geom_line(aes(color=countryid), color="dodgerblue1", size=1.4) +
  geom_line(aes(date, reshuffle), color="gray") + 
  theme_bw() +
  scale_x_continuous(name = 'date', 
                     breaks = c('1990', '1995', '2000', '2005', '2010'), 
                     labels = c('1990\ncold', '1995\nwarm', '2000\nwarm', '2005\ncold', '2010\nwarm'))

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