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 ?
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