I ended up finding one solution to my 2nd question. Here it is : http://tolstoy.newcastle.edu.au/R/help/04/01/0649.html Sorry for the bother. David
________________________________ De: GOUACHE David Date: ven. 01/08/2008 15:50 À: Deepayan Sarkar Cc: [EMAIL PROTECTED] Objet : RE : [R] bwplot with Date object Hello and thank you for your reply. My dummy example was a bit too simple... I'm having difficulty correctly specifying the 'at' component since my real situation concerns a multipanel display with ' relation="free" '. To illustrate : dates<-as.Date(32768:32895,origin="1900-01-01") plouf<-data.frame(days=dates,group=factor(rep(1:2,times=128/2))) plouf$group2<-factor(rep(1:2,each=2)) plouf$days[plouf$group2=="2"]<-plouf$days[plouf$group2=="2"]+50 bwplot(group~as.numeric(days)|group2,data=plouf,scales=list(x=list(at=mean(x),relation="free"))) I would have liked one tick at the mean of the x values in each panel... Which isn't what I obtain. How do I customize the location of the tick marks for each panel ? Thanks again. David ________________________________ De: Deepayan Sarkar [mailto:[EMAIL PROTECTED] Date: ven. 01/08/2008 00:12 À: GOUACHE David Cc: [EMAIL PROTECTED] Objet : Re: [R] bwplot with Date object On Thu, Jul 31, 2008 at 12:54 PM, GOUACHE David <[EMAIL PROTECTED]> wrote: > Hello R-helpers, > > I would like to produce a boxplot for dates, using lattice. > > Here is a dummy example : > > dates<-as.Date(32768:32895,origin="1900-01-01") > plouf<-data.frame(days=dates,group=factor(rep(1:2,times=128/2))) > > bwplot(group~days,data=plouf) > # doesn't work, whereas : > bwplot(group~as.numeric(days),data=plouf) > # does, but is obviously not good looking when it comes to axis legends... > > Is there a way to pull off a boxplot with dates ? The automatic calculation of tick positions clearly gives less than useful results. You should be able to supply locations explicitly using bwplot(..., scales=list(x = list(at = <...>)) ) -Deepayan ______________________________________________ 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.
