Dear Mr. Epstein,
This is another solution, two commands have been added to your own code: y=c(1.21,0.51,0.14,1.62,-0.8,0.72,-1.71,0.84,0.02,-0.12) ybar=mean(y) ll=length(y); ybarv=rep(ybar,ll) x=1:ll plot(x,ybarv,pch=1) segments(x[1],ybar,x[ll],ybar) ## cover the points with other points completely white: points(x,ybarv,pch=16,col='white') ## just write a black border over the white points (with pch=1) points(x,ybarv,pch=1,col='black') The two new commands are layered on top of the previous ones. To write "on top" of a plot command, use the points command. Regards, Paulo Barata ---------------------------------------------------------------- Paulo Barata Fundacao Oswaldo Cruz - Oswaldo Cruz Foundation Rua Leopoldo Bulhoes 1480 - 8A 21041-210 Rio de Janeiro - RJ Brazil E-mail: [EMAIL PROTECTED] Alternative e-mail: [EMAIL PROTECTED] ---------------------------------------------------------------- >Message: 14 >Date: Sun, 20 Jul 2008 13:44:27 +0100 >From: David Epstein <[EMAIL PROTECTED]> >Subject: [R] drawing segments through points with pch=1 >To: r-help@r-project.org >Message-ID: <[EMAIL PROTECTED]> >Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed > >Please excuse me for asking such basic questions: > >Here is my code >> > y=c(1.21,0.51,0.14,1.62,-0.8,0.72,-1.71,0.84,0.02,-0.12) >> > ybar=mean(y) >> > ll=length(y); >> > ybarv=rep(ybar,ll) >> > x=1:ll >> > plot(x,ybarv,pch=1) >> > segments(x[1],ybar,x[ll],ybar) > >What I get is a collection of small circles, with a segment "on top" >of the circles, which is almost what I want. But I don't want the >segment to be visible inside any small circle. > >Is there an easy way to arrange for the segment to "lie behind" the >pch=1 markers, as in hidden line removal, so that the circles remain >with nothing inside them? I tried putting the segments command first, >but then no segment appeared at all. > >In general, is there a method of laying a drawing "on top" of >another. I tried inserting add="T" as an argument to plot, and R >objected strongly. > >Thanks for any help > >David Epstein ______________________________________________ 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.
