[R] data.frame to array?

[rkevinburton at charter.net]

I have a list of data.frames

> str(bins)

List of 19217
 $ 100026:'data.frame':	1 obs. of  6 variables:
  ..$ Sku  : chr "100026"
  ..$ Bin  : chr "T149C"
  ..$ Count: int 108
  ..$ X    : int 20
  ..$ Y    : int 149
  ..$ Z    : chr "3"
 $ 100030:'data.frame':	1 obs. of  6 variables:
.......
As you can see one 'column' is "Count". This list seems to contain 19217 data.frames. I would like to create an array of 19217 integers which hold the values of the "Count" column. I have tried the obvious (to me):

bins[[1:3]]$Count

But that returns NULL instead of an array of length 3 that I was expecting. Interestingly bins[[1]]$Count returns the first "Count" in the list of data frames. How do I get all of the "Count"s?

Thank you.

Kevin