坐标转换实验

a=[0,0;1,-1;2,-2;3,-3;4,-4;5,-5];
% 画出散点a的二维图像
close(figure(60000));
figure(60000);hold on;plot(a(:,1),a(:,2),'b.','markersize',11);axis equal;%axis off;
figure(60000);hold on;plot(a(:,1),a(:,2),'r-','linewidth',1.1);axis equal;%axis off;
figure(60000);hold on;set(gca,'XAxisLocation','origin','YAxisLocation','origin');
figure(60000);hold on;xlabel('x','FontSize',16);
figure(60000);hold on;ylabel('y','FontSize',16);
% 旋转矩阵 顺时针旋转3*pi/4
rotate_a1=[cos(3*pi/4)  -sin(3*pi/4)
           sin(3*pi/4)  cos(3*pi/4)
            ];

% 旋转矩阵 逆时针旋转7*pi/4
rotate_a2=[cos(7*pi/4)  sin(7*pi/4)
           -sin(7*pi/4)  cos(7*pi/4)
            ];
        
% 旋转矩阵 逆时针旋转5*pi/4
rotate_a3=[cos(5*pi/4)  sin(5*pi/4)
           -sin(5*pi/4)  cos(5*pi/4)
            ];

a_after_rotate_clock=rotate_a1*a'; 
a_after_rotate_clock_1=a_after_rotate_clock';

a_after_rotate_clockwise=rotate_a2*a';
a_after_rotate_clockwise_1=a_after_rotate_clockwise';

a_after_rotate_clockwise_2=rotate_a3*a';
a_after_rotate_clockwise_3=a_after_rotate_clockwise_2';