I have a set of daily time series data for several years in R -


i have set of daily time series data several years (20-70 years). dates defined dd/mm/yyyy in 1 column, , daily flow values in another. intend sort , extract maximum flow each year in r.

try 1 of aggregating functions.

aggregate(flow~cbind(year=substr(year,7,11)), df1, fun=max) #   year flow #1 2001   23 #2 2002   26

or

library(data.table) setdt(df1)[, list(flow= max(flow)) ,.(year=substr(year, 7, 11))]   #   year flow #1: 2001   23 #2: 2002   26

another option converting 'date' class , extract 'year' part.

library(lubridate) setdt(df1)[, list(flow=max(flow)), .(year= year(dmy(year)))]

data

 set.seed(24)  df1 <- data.frame(year= c('26/05/2001', '27/05/2001', '02/01/2002',  '03/01/2002'), flow= sample(20:30,4, replace=false), stringsasfactors=false)

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