From your post it is not clear how the data are organized. Supposing they are in a data frame you could use the ~ sintax.
For example: timeColumn=as.Date("01-01-1970") + 1:500 timeSeries=rnorm(500) df=data.frame(time=timeColumn, index=timeSeries) > > head(df) > time index > 1 1-01-20 -0.6382554 > 2 1-01-21 -2.0346649 > 3 1-01-22 -0.4900213 > 4 1-01-23 0.7311806 > 5 1-01-24 0.9386528 > 6 1-01-25 0.7868129 boxplot(index~months(time), data=df) Perhaps you would order the 12 boxes according to the months: monthColumn=ordered(months(df$time), levels= c("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December")) boxplot(df$index~monthColumn) domenico [EMAIL PROTECTED] wrote: > Hi all, > > I'm trying to plot my daily time series, with 3650 observations( 10 years), > with boxplot but I want 12 boxes, one for each month, can anyone help me > doing that. > > Best regards > > ______________________________________________ > 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. > > ______________________________________________ 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.