[R] extracting columns from a ts series
Antonio
rod.chav at hsoft.es
Tue Sep 25 20:02:38 CEST 2001
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 RodrÃguez 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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