Thanks Hadley, Thierry for clearing up my misuse of the command syntax. Thierry, the more I try the density plot, the more I see that it is right for my application. Good call.
Be Well and Happy Always Chris ONKELINX, Thierry wrote: > > Dear Chris, > > First of all I would go for the density plot. The 'extra' info from the > histogram is just noise. So I guess you are not interessed in it. > > ggplot(xy, aes(x=value, colour=case, group=case)) + geom_density() > > But is you want to stick with a histogram then I would use one of the > two below > > ggplot(xy, aes(x=value, fill=case, group=case)) + > geom_histogram(binwidth=0.1, position = "identity", alpha = 0.2) > ggplot(xy, aes(x=value, fill=case, group=case)) + > geom_histogram(binwidth=0.1, position = "dodge") > > HTH, > > Thierry > > ------------------------------------------------------------------------ > ---- > ir. Thierry Onkelinx > Instituut voor natuur- en bosonderzoek / Research Institute for Nature > and Forest > Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, > methodology and quality assurance > Gaverstraat 4 > 9500 Geraardsbergen > Belgium > tel. + 32 54/436 185 > thierry.onkel...@inbo.be > www.inbo.be > > To call in the statistician after the experiment is done may be no more > than asking him to perform a post-mortem examination: he may be able to > say what the experiment died of. > ~ Sir Ronald Aylmer Fisher > > The plural of anecdote is not data. > ~ Roger Brinner > > The combination of some data and an aching desire for an answer does not > ensure that a reasonable answer can be extracted from a given body of > data. > ~ John Tukey > > -----Oorspronkelijk bericht----- > Van: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > Namens hadley wickham > Verzonden: woensdag 19 augustus 2009 14:18 > Aan: Chris Friedl > CC: r-help@r-project.org > Onderwerp: Re: [R] ggplot2 legend problem > > On Tue, Aug 18, 2009 at 11:10 PM, Chris Friedl<cfrieda...@gmail.com> > wrote: >> >> Still struggling with this. A further example using a slightly >> different organisation of the data. The factors "A" and "B" are >> included in the dataframe in an attempt to get ggplot to generate a > legend automatically. >> >> x <- data.frame(value=rnorm(5000, mean=0), case="A") y <- >> data.frame(value=rnorm(5000, mean=3), case="B") xy <- rbind(x, y) >> ggplot(xy, aes(x=value, fill=case, group=case)) + >> geom_histogram(binwidth=0.1) >> ggplot(xy, aes(x=value, fill=case, group=case)) + >> geom_density(alpha=0.2) >> >> Whilst the legend is generated as expected the histogram and density >> plots are different. The density plots overlap each other whereas the >> histogram plots stack. I'm trying the get the histogram plots to >> overlap, and retain the legend. Is the histogram stacking by design? >> Can stacking be changed to overlapping? > > I'm skeptical that this will create a useful plot, but > > geom_histogram(binwidth=0.1, position = "identity") > > will do what you want. You might also want to look at geom_freqpoly. > > Alternatively, to use your previous approach, you just need to make a > couple of small changes: > > g + geom_histogram(aes(x=X, fill = "A"), colour="black", binwidth = 0.1) > + > geom_histogram(aes(x=Y, fill = "B"), colour="black", binwidth = 0.1) > + > scale_fill_manual("Case", c("A" = alpha("red", 0.5), > "B"=alpha("blue",0.5))) > > Previously you weren't supplying the fill aesthetic so the scale had > nothing to work with. > > Hadley > > -- > http://had.co.nz/ > > ______________________________________________ > 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. > > Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver > weer > en binden het INBO onder geen enkel beding, zolang dit bericht niet > bevestigd is > door een geldig ondertekend document. The views expressed in this message > and any annex are purely those of the writer and may not be regarded as > stating > an official position of INBO, as long as the message is not confirmed by a > duly > signed document. > > ______________________________________________ > 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. > > -- View this message in context: http://www.nabble.com/ggplot2-legend-problem-tp25036665p25054892.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.