[R] sd, mean with a frequency distribution matrix

[JS Huang]

Hi,

  Just learned another way to calculate sd for a frequency distribution
matrix:

> p <- matrix(c(10,3,20,4,30,5),ncol=2,byrow=TRUE)
> p
     [,1] [,2]
[1,]   10    3
[2,]   20    4
[3,]   30    5
> rep(p[,1],p[,2])
 [1] 10 10 10 20 20 20 20 30 30 30 30 30
> sd(rep(p[,1],p[,2]))
[1] 8.348471



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