[R] Regular repeats

[jsf1982]

Hi,
Many apologies for the simplicity (hopefully!) of this request - I can't
find it on the forum, but it may have been asked in the past.

I have a data frame consisting of ~2000 rows. I simply want to take the
average of the first 6, then the next 6, then the next 6 until the end of
the table. 
The command 

mean(mole[1:6,c("PercentPI")])

gets me the first 6 rows (column is PercentPI), but I don't know how to
increase the rows incrementally.

Thanks in advance.
J





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