[R] extracting columns from a ts series

[Antonio]

Hi All,

I have a time series called 'upwelling',  like this:

>upwell

       	Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov
1984           	              494.7 303.7 220.8 288.4 188.1 125.5 215.7
1985  	56.0 127.4 165.8 189.4 261.6 223.7 186.3 150.2 107.8 120.3  91.1

from 1984 until 2000. How do I could extract, i.e, Jan or Dec columns from
the data? Or how do I could calculate, say, winter upwelling: Dec+Jan+Feb+Mar?

Thanks,

Antonio

PD: Does anybody knows if the EM algorithm (Shumway and Stoffer) for
missing data,  has been developped within R?
Antonio Rodríguez Verdugo
C.I.C.E.M. "Agua del Pino"
Delegacion Provincial de Agricultura y Pesca
P.O. Box 104
21071 HUELVA (Spain)


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