>>>>> Stephen Liu <sati...@yahoo.com> >>>>> on Sat, 20 Nov 2010 00:12:07 -0800 (PST) writes:
> Hi Josh and David, > Problem solved. > Both following steps work. > 1) >> ToothGrowth >> attach(ToothGrowth) >> plot(dose,len) # this step is needed. Don't close the diagram. Otherwise >> following command won't work. >> matrics=lm(len~dose) >> abline(matrics) > Graph displayed > 2) >> ToothGrowth >> attach(ToothGrowth) >> plot(dose, len) # this step is needed. Don't close the diagram. Otherwise >> following command won't work. >> abline(lm(len ~ dose, data = ToothGrowth)) > Graph displayed Well, it is *VERY BAD* style and error-prone practice nowadays, to attach a data set. [The only thing to attach() are save()d data *files*; there it's often tidier to attach() instead of to load() ...] I have not followed all the things you tried .. or did not try. A much better way of achieving the above (and yes; *never* close the graphics window within these) should be plot ( len ~ dose, data=ToothGrowth) abline(lm(len ~ dose, data=ToothGrowth)) and you can see {if you use a fixed-width font in your e-mail, it "springs into your eyes"} how nicely the formula notation of graphics alings with the same in models. If the above two simple lines do not work correctly, then your R environment is "broken" in some way, and maybe first doing rm(list = ls()) may help. Martin Maechler, ETH Zurich and R Core Team > B.R. > Stephen L > ----- Original Message ---- > From: Joshua Wiley <jwiley.ps...@gmail.com> > To: Stephen Liu <sati...@yahoo.com> > Cc: r-help@r-project.org > Sent: Sat, November 20, 2010 1:39:45 PM > Subject: Re: [R] An empty grey diagram > On Fri, Nov 19, 2010 at 9:35 PM, Stephen Liu <sati...@yahoo.com> wrote: >> Hi David, >> >> >>> What happens when you follow the directions... i.e. type: >>> plot.new() #??? >> >> abline(lm(len ~ dose, data = ToothGrowth)) >> plot.new() >> >> The grey background changes to white, still an empty graph > You cannot just use abline() on an empty graphic (well, you can but > you get an empty graph). Please actually run my code, it will create > a scatter plot, then add a line. Do not close the graphic device in > between. > with(ToothGrowth, plot(dose, len)) > abline(lm(len ~ dose, data = ToothGrowth)) > ______________________________________________ > 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.