在ggplot中编辑图例标签

Question

我有一个如下所示的数据框:

data
    median  min max no_of_threads
    2.33    2.10    6.85    1
    2.43    2.14    3.41    2
    2.39    2.13    7.90    3
    2.74    2.10    8.30    4
    2.53    2.21    6.69    5

我做了这个R函数,它将数据$ min和数据$ max绘制为范围,数据$ median为line:

scalability_graph <- function(data){ 
  h <- ggplot(data)
  h <- h + 
      geom_ribbon(aes(x = no_of_threads, ymin = min, ymax = max)) +
      geom_line(aes(x = no_of_threads, y=median, color="#CC873D")) +
      scale_x_continuous("Number of threads", lim=c(0,20)) +
      scale_y_continuous("Response time", lim=c(0,13)) +
      opts(legend.position=c(0.20,0.90))
}

该脚本生成此图:

如何更改图例中的标签并放置"范围"而不是顶部粗体字符串,并使用"中位数"而不是底部标签？

Answer 1

你可以通过添加这个来做到这一点:

 + scale_colour_manual("range", labels = "median", values = "#CC873D", breaks = "#CC873D") 

但你的情节和传说应该是这样的吗？

h <- ggplot(data, aes(no_of_threads, median)) +
  geom_ribbon(aes(ymin = min, ymax = max, fill = factor(1))) +
  geom_line(aes(color=factor(1))) +
  scale_x_continuous("Number of threads", lim=c(0,20)) +
  scale_y_continuous("Response time", lim=c(0,13)) +
  scale_fill_manual(breaks = 1, values = "grey20", labels = "range") + 
  scale_colour_manual(breaks = 1, values = "#CC873D", labels = "median") +
  opts(legend.position=c(0.20,0.85), legend.title = theme_blank(), legend.background = theme_blank())