[R] group means

Jeremy Z Butler
2003-02-20T23:45:04Z

Hi,
Any hints on how I would generate the means of each 5 number group in a
column of numbers in data.frame form. i.e. get mean of first five in column
and then mean of second five in column etc. etc.

1   3.4
2   6.0
3   2.5
4   7.5
5   1.8
6   4.2
7   6.4
8   5.7
9   17.2
10  13.5

Grateful for any suggestions
Jeremy