On Mon, 25 Aug 2003, Angel wrote: > Thanks for the advise. Sorry, I should have explained better. > As you say xlim and ylim have an effect. But when they do not match the > width and height of the plot region , one of them is modified in order to > make the plot fill the whole plot region with the aspect ratio given. > I would have expected that because I give asp, xlim and ylim, then the plot > region would be automatically modified. > After reading An Introduction to R, I would have expected R to automatically > do something like: > > xlim<-c(-1,1) > ylim<-c(-1,2) > xyratio=abs((xlim[1]-xlim[2])/(ylim[1]-ylim[2])) > width<-par("pin")[1] > height<-par("pin")[2] > if (height>width/xyratio) height=width/xyratio else if(height<width/xyratio) > width=height*xyratio > par(pin=c(width,height)) > > And, now, I get what I wanted: > plot(boxxy,type="l",xaxs="i",yaxs="i",xlim=c(-1,1), ylim=c(-1,2),asp=1) > > That was exactly what I actually wanted to do. > > Obviously, because I am setting the aspect ratio through par("pin"), now I > get the same plot without the asp option. > plot(boxxy,type="l",xaxs="i",yaxs="i",xlim=c(-1,1), ylim=c(-1,2)) > > > I though I could ask why this is not done automatically, from my point of > view, the most sensible thing would be that if I give asp, xlim and ylim > then the plot region is modified to satisfy them (and not xlim or ylim > modified to satisfy the plot region defaults).
What _you_ wanted in one example is not necessarily the most logical or useful. Consider what would happen if you added new=TRUE? I think you have not grasped the logical order: the plot region is set before a user coordinate system is set up (or changed). We do expect people to read `An Introduction to R' .... -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help