If a solid circle is ok then one can use the symbol pch=19 and blow it up using cex=, e.g.
plot(0, pch=19, cex=5, col="blue") See balloonplot in package gplots for an example of this. On 5/19/05, Chuck Cleland <[EMAIL PROTECTED]> wrote: > See ?symbols. For example: > > > a <- 1.975 # valore x del centro > > b <- 1.215 # valores y del centro > > r <- 1.460 # radio > > plot(0,0, type = "n", ylim=c(b - r, b + r), xlim=c(a - r, a + r)) > > symbols(x = a, y = b, circles = r) > > Mario Morales wrote: > > Hi. > > > > I need to draw a circle whit center (a,b) and radio r. So I use the > > R code below > > > > a<-1.975 # valore x del centro > > b<-1.215 # valores y del centro > > r<-1.46 # radio > > x1<-seq(a-r,a+r,by=0.01); #los valores de x > > yp<-sqrt(r^2-(x1-a)^2)+b; # los valores y a partir de la ra�z positiva > > yn<-(-1)*sqrt(r^2-(x1-a)^2)+b; # los valores y a partir de la ra�z negativa > > x<-c(x1,x1); y<-c(yp,yn); > > > > plot(x,y,type="l",ylab="",xlab="",xlim=range(x),ylim=range(y)); > > > > > > My circle have two problems. > > > > First. I don't want the horizontal line and I don't know how avoid > > it. > > > > Second. It is shaped like ellipse. I need adjust the x and y scales, > > but I don't know how. > > > > Can you help me??? > > > > there is another way to draw a circle whit R ? > > > > ______________________________________________ > > [email protected] mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! > > http://www.R-project.org/posting-guide.html > > > > > > -- > Chuck Cleland, Ph.D. > NDRI, Inc. > 71 West 23rd Street, 8th floor > New York, NY 10010 > tel: (212) 845-4495 (Tu, Th) > tel: (732) 452-1424 (M, W, F) > fax: (917) 438-0894 > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
