library(UsingR)
    brightness

    MyMean <- mean(brightness)
    MyMedian <- median(brightness)
    MySd <- sd(brightness)

    hist(brightness,breaks=35,main="This is a Histogram",xlab="Brightness",ylab="Frequency",xlim=c(0,15),ylim=c(0,200))

    text(3.5,150,paste("Mean =",round(MyMean,1),"\n Median =",round(MyMedian,"\n Std.Dev =",round(MySd,1)))

此代码生成：

此输出的问题是文本未左对齐。有谁知道如何使文本保持对齐。

谢谢。