function Circle(x,y,R)

Plots a circle. x - abscissa of the centre. y - ordinate of the centre. R - radius

% Create a vector for the angles for which the points of the circle will be
% calculated.
fi=0:1:360;
% Grade --> Radian conversion.
fi=fi*pi/180;
% Coordinates of the points of the circle
px=ones(size(fi))*x+R*cos(fi);
py=ones(size(fi))*y+R*sin(fi);
% Plot the circle.
plot(px,py,'-k');