Dear Users,

I have a monthly data for a number of years(1960-2007) for a number of 
stations and i wish to extract sesonal time-series for the months of 
March-May and October-November for very station. I have read this data with 
read.table  in R with stations as columns and time (months) as rows. My 
attempt to aggregate with the zoo package using the function as.yearqtr 
failed since this sums evey three months of the year from January. Is there 
away it can be coersed to aggregate particular months as in my case? 

Thanks

----------------------------
 ZABLONE OWITI
 GRADUATE STUDENT
College of Atmospheric Science
Nanjing University of Information, Science and Technology
Add: 219 Ning Liu Rd, Nanjing, Jiangsu, 21004, P.R. China
 Tel: +86-25-58731402
Fax: +86-25-58731456 
Mob. 15077895632 
Website:  www.nuist.edu.cn 
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