circle<-function(x.center,y.center,radius,...){
nseg=360
xx <- x.center + radius*cos( seq(0,2*pi, length.out=nseg) )
yy <- y.center + radius*sin( seq(0,2*pi, length.out=nseg) )
print(x.center)
#lines(xx,yy,...)
return(cbind(xx,yy))
}
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