Re: [R] how to draw an ellipse
Guillaume Allain guillaume.allain at cbconseil.com writes: That's probably a stupid question, but I'm looking for a low-level command which plots ellipse, specifying only center and deformation axes. The purpose is to illustrate bivariates gaussians with 2D .95 confident levels without using any specific library. Thanxs for your help, Guillaume I don't know exactly why you want to avoid using any specific library, but the ellipse package (sic) would seem to do what you want pretty conveniently ... cheers Ben Bolker __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] how to draw an ellipse
Le 18.08.2005 15:45, Guillaume Allain a écrit : That's probably a stupid question, but I'm looking for a low-level command which plots ellipse, specifying only center and deformation axes. The purpose is to illustrate bivariates gaussians with 2D .95 confident levels without using any specific library. Thanxs for your help, Guillaume Hello, Why don't you want to use any specific library ? You can't reinvent the wheel !! There is a package ellipse on CRAN which will do what you are looking for. Have you tried RSiteSearch(ellipse) Cheers, Romain -- visit the R Graph Gallery : http://addictedtor.free.fr/graphiques ~ ~~ Romain FRANCOIS - http://addictedtor.free.fr ~~ Etudiant ISUP - CS3 - Industrie et Services ~~http://www.isup.cicrp.jussieu.fr/ ~~ Stagiaire INRIA Futurs - Equipe SELECT ~~ http://www.inria.fr/recherche/equipes/select.fr.html~~ ~ __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] how to draw an ellipse
Romain Francois wrote: Why don't you want to use any specific library ? You can't reinvent the wheel !! True, but Madonna is always reinventing herself... There is a package ellipse on CRAN which will do what you are looking for. Have you tried RSiteSearch(ellipse) its simple geometry really: theta=seq(0,2*pi,len=100) e=1.5 r=3 x=e*r*cos(theta) y=r*sin(theta) plot(x,y,asp=1) rotate with: phi=pi/4 xr=x*sin(phi)+y*cos(phi) yr=-x*cos(phi)+y*sin(phi) plot(xr,yr,asp=1) or something. Wrap that up into a function and you're done. This is off-the-cuff, I've probably messed something up. So use one prepared earlier from a library... Baz __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] how to draw an ellipse
Congratulations guys, you made my day better and funnier! Le 18 août 05, à 17:31, Barry Rowlingson a écrit : Romain Francois wrote: Why don't you want to use any specific library ? You can't reinvent the wheel !! True, but Madonna is always reinventing herself... There is a package ellipse on CRAN which will do what you are looking for. Have you tried RSiteSearch(ellipse) its simple geometry really: theta=seq(0,2*pi,len=100) e=1.5 r=3 x=e*r*cos(theta) y=r*sin(theta) plot(x,y,asp=1) rotate with: phi=pi/4 xr=x*sin(phi)+y*cos(phi) yr=-x*cos(phi)+y*sin(phi) plot(xr,yr,asp=1) or something. Wrap that up into a function and you're done. This is off-the-cuff, I've probably messed something up. So use one prepared earlier from a library... Baz __ Guillaume Allain Carte Blanche Conseil 47 rue de Lancry 75010 Tel : 01 42412121 Mail : [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
