ggplot与x轴上的字符串-ggplotwithStringsonx-Axis

19  

Your problem is that the x variable is a factor. So, change your data frame and make x a double:

你的问题是x变量是一个因素。因此，更改数据框并将x设为double：

df = rbind(data.frame(x=4:1,y=rnorm(4),d="d1"), 
           data.frame(x=3:1,y=rnorm(3),d="d2"))

Plot as normal

情节正常

g = ggplot(df, aes(x,y)) + geom_line(aes(colour=d))

but alter the x-axis scaling explicitly:

但明确改变x轴缩放：

g + scale_x_continuous(breaks=1:4, labels=c("one", "two", "three", "four")) 

To rename your variable, try something like:

要重命名变量，请尝试以下操作：

x1 = factor(df_nok$x, 
            levels=c("one", "two", "three", "four"), 
            labels=1:4)
df$x1 = as.numeric(x1)

5  

You can convince ggplot to draw lines by adding a dummy group,

您可以通过添加虚拟组来说服ggplot绘制线条，

ggplot(df_nok, aes(x,y)) + geom_line(aes(colour=d, group=d))

Also see http://kohske.wordpress.com/2010/12/27/faq-geom_line-doesnt-draw-lines/

另见http://kohske.wordpress.com/2010/12/27/faq-geom_line-doesnt-draw-lines/

3  

Add in the group aesthetic (sort of redundant, I know, but much simpler than re-jigging the axis labels).

添加组审美（有点多余，我知道，但比重新标记轴标签简单得多）。

df_nok <- rbind(data.frame(x=c("four","three","two","one"),y=rnorm(4),d="d1"),data.frame(x=c("three","two","one"),y=rnorm(3),d="d2"))

ggplot(df_nok, aes(x,y, group=d)) + geom_line(aes(colour=d))

It's true your x-axis is still probably not in the order you want. As noted by @csgillespie you can fix this by making it into a factor

你的x轴确实可能不是你想要的顺序。正如@csgillespie所指出的，你可以通过将其作为一个因素来解决这个问题

df_nok$x <- factor(df_nok$x, 
            levels=c("one", "two", "three", "four"), 
            labels=1:4)