R 我只需要用最简单的方法在我的bloxplot上加一个字母

我不每天使用R，我知道有更多改进的方法可以做到这一点，但我已经准备好了代码，我想在不必使用ggplot或其他机制的情况下在条上发送文本，如何通过条上的“a”“b”“b”来实现

y1 = c(11.66, 8.03, 14, 11.5, 8.66)
y2 = c(3.86, 4.41, 2.66, 7,41, 7.8)
y3 = c(7.58, 5.83, 7.66, 5.16, 4.5)
boxplot(y1,y2,y3,names=c("Controle", "Maceração", "Infusão"),main="Germinação", ylim = c(0,15),
        xlab="Tratamento", ylab="IVG", col=(c("blue","red","green")))

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您可以使用

text

在条上添加文本

y1 = c(11.66, 8.03, 14, 11.5, 8.66)
y2 = c(3.86, 4.41, 2.66, 7.41, 7.8)
y3 = c(7.58, 5.83, 7.66, 5.16, 4.5)
boxplot(y1,y2,y3,names=c("Controle", "Maceração", "Infusão"),
       main="Germinação", ylim = c(0,15),
        xlab="Tratamento", ylab="IVG", col=(c("blue","red","green")))
text( 
  x= 1:3, 
  y= c(max(y1), max(y2), max(y3)) + 0.8, 
  c('a', 'b', 'c') 
)

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非常感谢