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  jan_data2
  
2010 Sep 02
0
extract month data automatically
Hi,
I would like to extract monthly data automatically using a code.  Given are my 
sample data.
I know how to do one by one: 
jan_data1 <- Pooraka_data[Pooraka_data$Month=="1",4]
feb_data1 <- Pooraka_data[Pooraka_data$Month=="2",4]
mar_data1 <- Pooraka_data[Pooraka_data$Month=="3",4]
apr_data1 <- Pooraka_data[Pooraka_data$Month=="4",4]
...
then i try:
p0_mn <- function(dt)
{ ...