On 9/24/05, Marc Schwartz <[EMAIL PROTECTED]> wrote: > On Sat, 2005-09-24 at 11:48 -0400, Gabor Grothendieck wrote: > > I noticed, what seened to me, to be odd. These produce > > a boxplot in the first case and a spineplot in the second > > case in R .2.2.0: > > > > plot(Sepal.Length ~ Species, iris) > > plot(Species ~ Sepal.Length, iris) > > > > What if one wants to exchange axes? Does the fact that > > this seemingly innocuous change result in completely > > different graphics make sense? Is it desirable? > > Gabor, > > Did you try: > > plot(Sepal.Length ~ Species, iris, horizontal = TRUE)
I had tried horiz= which did not have any effect but I should have written it all out since it comes after a ... . In any case it works as you have shown but not if I interchange the variables. > > This will rotate the boxplot by 90 degrees, as expected. > > The plot method is dispatched based upon (from ?plot.formula): > > If y is an object (i.e. has a class attribute) then plot.formula looks > for a plot method for that class first. Otherwise, the class of x will > determine the type of the plot. For factors this will be a parallel > boxplot, and argument horizontal = TRUE can be used (see boxplot). > > > Since there is no plot.numeric(), plot.factor() will be used. > > This is unchanged from 2.1.1. > > What is changed is the plot that is created in your second case. In > 2.1.1, this was a barplot, rather than a spineplot. From > 2.1.1 ?plot.factor: > > This functions implements a "scatterplot" method for factor arguments of > the generic plot function. Actually, boxplot or barplot are used when > appropriate. > > > >From 2.0.0 beta ?plot.factor: > > This functions implements a "scatterplot" method for factor arguments of > the generic plot function. Actually, boxplot is used when y is numeric > and a spineplot when y is a factor. For a single factor x (i.e., with y > missing) a simple barplot is produced. > > > > HTH, > > Marc Schwartz > > > OK. Thanks. ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
