[R] monthly means of ts object

Hamid Hamid hamid200356 at gmail.com
Sat Apr 30 13:15:46 CEST 2011

Dear user,
I have a monthly time series data (length 144), as ts (time series)
object in R. I would like to
1-extract vector of let say January data (a vector of length 12),
2-extract the monthly means, sums  (a vector of length 12).
Many tahnks in advance

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