[R] getting a weighted average from a table

[SHANE MILLER, BLOOMBERG/ 731 LEXIN]

Hi,

I have a very simple request (I think).
I have a vector/array,

  > c <- c(1.3,1.2,1,3.3,3.3,5.1,1.1,1.2,0)

I produce a reverse sorted table/histogram with it,

  > t = rev(sort(table(c))
  > t
  c
  3.3 1.2 5.1 1.3 1.1   1   0 
    2   2   1   1   1   1   1 

I would now like to get the labels "3.3 1.2 5.1 1.3 1.1   1   0"
into its own vector and the # of counts "2   2   1   1   1   1   1"
so I can calculate weighted averages. So if I can get the labels into
a vector l and the counts into a vector n,

  l <- c(3.3,1.2,5.1,1.3,1.1,1,0);
  n <- c(2,2,1,1,1,1,1);

for(i=0;i<7;i++)
  total = l[i]*n[i]
total = total / sum(n)     <- this is the weight average