[R] Drawing a circle

From: Mario Morales <malfonso_at_telecom.com.co>
Date: Thu 19 May 2005 - 20:14:44 EST


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 raz positiva yn<-(-1)*sqrt(r^2-(x1-a)^2)+b; # los valores y a partir de la raz 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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