r - R Programming：如何在 qplot 的条形上方放置标签？

Question

可能重复：
如何使用 ggplot2 在 R 中的 geom_bar 上放置标签

我一直在寻找如何在我的 qplot 栏顶部放置标签的方法。这是下面的图片

和代码，

library(ggplot2)
library(colorRamps)
TawiTawiPop <- c(17000, 45000, 46000, 59000, 79000, 110000, 143000, 195000, 228204, 250718, 322317, 450346, 366550)
YearNames <- c("1903", "1918", "1939", "1948", "1960", "1970", "1975", "1980", "1990", "1995", "2000", "2007", "2010")

qplot(YearNames, TawiTawiPop, 
      xlab = expression(bold("Censal Year")), 
      ylab = expression(bold("Population")), 
      geom = "bar",
      stat = "identity", colour = I("red"), 
      fill = matlab.like2(13)) + theme_bw() + 
      opts(
        title = expression(bold("Tawi-Tawi Population from 1903 to 2010")),
        plot.title = theme_text(size = 18, colour = "darkblue"),
        legend.position = "none",
        panel.border = theme_rect(linetype = "dashed", colour = "red"))
        plot.title = theme_text(size = 18, colour = "darkblue")

现在我想在它上面贴一个标签，就像下面的那个。我在 Mathematica 中做了这个

那些标签“17000、45000 等等”，我想把它放在我的 qplot 中。

Answer 1

library(ggplot2)
library(colorRamps)
TawiTawiPop <- c(17000, 45000, 46000, 59000, 79000, 110000, 143000, 195000, 228204, 250718, 322317, 450346, 366550)
YearNames <- c("1903", "1918", "1939", "1948", "1960", "1970", "1975", "1980", "1990", "1995", "2000", "2007", "2010")

qplot(YearNames, TawiTawiPop, 
      xlab = expression(bold("Censal Year")), 
      ylab = expression(bold("Population")), 
      geom = "bar",
      stat = "identity", colour = I("red"), 
      fill = matlab.like2(13)) + theme_bw() + 
      opts(
        title = expression(bold("Tawi-Tawi Population from 1903 to 2010")),
        plot.title = theme_text(size = 18, colour = "darkblue"),
        legend.position = "none",
        panel.border = theme_rect(linetype = "dashed", colour = "red"),
        plot.title = theme_text(size = 18, colour = "darkblue"))+
     geom_text(aes(label = TawiTawiPop,angle=90,hjust=-0.1))