MATLAB三点确定圆

function [circleCenter,radius] = ThreePointCircle(obj,x,y,z)
            A=[x(1)-y(1),x(2)-y(2);z(1)-y(1),z(2)-y(2)];
            B=[x(1)^2-y(1)^2+x(2)^2-y(2)^2;z(1)^2-y(1)^2+z(2)^2-y(2)^2];

            ab=A\B;
            a=ab(1)/2;
            b=ab(2)/2;
            circleCenter = [a,b];

            c2 = (x(1)-a)^2+(x(2)-b)^2;
            radius = sqrt(c2);
        end

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参考程序