H = grfun.plotcircle(X,Y,RAD,...)
X [ numeric ] - X-axis location of the centre of the circle.
Y [ numeric ] - Y-axis location of the centre of the circle.
RAD [ numeric ] - Radius of the circle.
H [ numeric] - Handle to the line or the filled area.'fill=' [ true | false ] - Switch between a circle ('fill=' false) and a disc ('fill=' true).Any property name-value pair valid for line graphs.