time series analysis

Hi

Currently I am working on a river discharge data analysis. I have the daily
discharge record from 1935 to now. I want to extract the annual maximum
discharge for each hydrolocial year (*start from 01/11 to next year 31/10*).
However, I found that the hydroTSM package can only deal with the natural
year. I tried to use the "zoo" package, but I found it's difficult to
compute, as each year have different days. Does anyone have some idea?
Thanks.

the data looks like:

01-11-1935 66302-11-1935 59603-11-1935 45004-11-1935 38105-11-1935
35406-11-1935 312

my code:

mydata<-read.table("discharge")
colnames(mydata) <- c("date","discharge")

library(zoo)
z<-zooreg(mydata[,2],start=as.Date("1935-11-1"))

mydta$date <- as.POSIXct(dat$date)

q.month<-daily2monthly(z,FUN=max,na.rm = TRUE,date.fmt =
"%Y-%m-%d",out.fmt="numeric")
q.month.plain=coredata(q.month)

z.month<-zooreg(q.month.plain,start=1,frequency=12)

Thanks very much.

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