(1)은

>> plot(x,y,'--rs','LineWidth',2,'MarkerEdgeColor','k',...

         'MarkerSize',10),

(2)는 

>>t=linspace(0,2*pi,100); x=2*cos(t); y=2*sin(t);

>> plot(x,y)

 

(3)은 

>>t=linspace(0,2*pi,100); x=2*cos(t); y=2*sin(t);

>> plot(x,y); axis square;


(4)는

>> t=linspace(0,2*pi,100); x=2*cos(t); y=2*sin(t);

>> plot(x,y); axis equal


(5)는

>> t=linspace(0,2*pi,100); x=2*cos(t); y=2*sin(t);

>> plot(x,y); axis image;

에 대한 결과물입니다.