What format does your date have? This is essential here. However it must be something like subset(yourdata, year %in% 2004) how to extract the year from your date you must find out yourself... (depending on the dates format...)
ever considered reading an introductory text? find some here: http://cran.r-project.org/other-docs.html Stefan elyakhlifi mustapha wrote: > hi, > ok I understand how to use the subset function but sometimes I need to use it > to extract data by date and its format it isn't so easy (like below) > for example like in using SQL I thougth that it was possible to write > "%/2004" but it doesn't run. Can you help me please about this? > > subset(don, Date_O in "%/2004", select = c(Annee_O, Date_O)) > > > > ___________________________________________________________________________ > Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! > Profitez des connaissances, des opinions et des expériences des internautes > sur Yahoo! Questions/Réponses > > [[alternative HTML version deleted]] > > > ------------------------------------------------------------------------ > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.