[R] extracting columns from a ts series

[Antonio]

Hi Uwe



>For Dec columns use 
> window(upwell, start=c(1984, 12), frequency=1)

This works OK

But the other formula not. Maybe is my fault, I was not clear. What I need is:

(Dec(t-1)+Jan(t)+Feb(t)+March(t))/4

With your help I did the following:

- I extracted each series as you mentioned above, then I convert them this
way:

dec<- window(upwell, start=c(1984, 12), frequency=1)
d<-dec[c(1:16)]

and so on with Jan, Feb, March

Then:

wintermean<-(d+j+f+m)/4

And.. Goal!

Maybe is long, long walk, but it works

Cheers,

Antonio
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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