(3) clear;
w=[2,3,4,5,6,7,8,9,10;4,2,0,2,4,2,0,2,4];
plot(w(1,
,w(2,
);
hold on;
theta=[pi/4,pi/2,pi,3*pi/2];
color=['r','b','y','k'];
for i=1:4
T=[cos(theta(i)),-sin(theta(i));sin(theta(i)),cos(theta(i))];
w1=T*w;
plot(w1(1,
,w1(2,
,color(i));
hold on;
end
(4)
笔顺长度指什么？线条的长度？