[求助]matlab的两道题（分叉与混沌、正交变换问题）

[vivianmatlab]

题目我用word打出来了，在附件里。希望大家帮我解答。谢谢大家。希望大家可以帮我写出详细的代码。我只自学了一周，学校就要求结课交作业了，所以有很多不懂的地方，大家多多帮忙，谢谢了。

[yuxuanqk]

应该不难
(1)
clear;
r=[0.3,0.8,1.1,1.8,2.2,2.7,2.9,3.3,3,3.9];
len=length(r);
for i=1:len
x(1)=0.1;
for k=1:99
x(k+1)=r(i)*x(k)*(1-x(k));
end
for k=100:150
x(k+1)=r(i)*x(k)*(1-x(k));
plot(r(i),x(k+1),'*');
hold on;
end
end

(2)
clear;
for r=2.7:0.005:3.9
x(1)=0.1;
for k=1:99
x(k+1)=r*x(k)*(1-x(k));
end
for k=100:150
x(k+1)=r*x(k)*(1-x(k));
plot(r,x(k+1));
hold on;
end
end

[yuxuanqk]

(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？