A reproducible example would help. What is "Phenology_VE$Date"? This works
> as.Date("2009-09-01", "%Y-%m-%d") [1] "2009-09-01" Is this the date you wanted: > as.Date(39936, origin='1900-2-1') [1] "2009-06-05" On Wed, Sep 2, 2009 at 2:09 AM, swertie<v_coudr...@voila.fr> wrote: > > As suggested in the article R News 4/1, I used > as.Date(as.character(Phenology_VE$Date), "%Y-%m-%d"), however this function > returns me only "NA" values > > as.Date(as.character(Phenology_VE$Date), "%Y-%m-%d") > [1] NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA > NA > [26] NA NA NA NA NA NA NA NA NA NA > > > The date corresponding to 39939 is really 06.05.2009, so it doesn't match R > format. > > I tried to use > > names(Date)<-c("06.05","07.05","11.05","19.05","20.05","22.05","23.05","24.05","28.05","29.05","31.05","03.06","04.06","09.06","10.06","12.06","14.06","17.06","24.06","29.06","30.06","01.07","26.07","27.07","29.07","04.08","05.08","12.08","13.08","14.08","17.08","18.08","19.08","27.08","28.08") > > plot(Date, Phenology_VE[,3], ylim=range(0, 16), > main=names(Phenology_VE[3]),xaxt="n", yaxt="n") > axis(1, labels=names(Date), at=Date) > > It works more or less, but I don't get regular intervals, but a thick for > each date. Do you have any idea how I could represent only some dates? > Thank you > > > > -- > View this message in context: > http://www.nabble.com/Date-format-in-plot-tp25244066p25252150.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org 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. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? ______________________________________________ R-help@r-project.org 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.