问一下大家为啥出错了，是哪一步出了问题吗

>> x=-pi:pi/100:pi;
y1=cos(1.*(1./cos(x)));
y2=cos(2.*(1./cos(x)));
y3=cos(3.*(1./cos(x)));
y4=cos(4.*(1./cos(x)));
y5=cos(5.*(1./cos(x)));
plot(x,y1,x,y2,x,y3,x,y4,x,y5);
legend('m=1','m=2','m=3','m=4','m=5');
title('Chebyshev');
xlabel('X'),ylabel('Y');
>> grid;
>> x=linspace(-1,1);
>> y=[];
>> for m=1:5
y=[y,cos(m*acos(x))];
end
>> plot(x,y);
Error using plot
Vectors must be the same lengths.

>> legend('m=1','m=2','m=3','m=4','m=5')
>>

仅供参考

1. x=-pi:pi/100:pi;
   
2. y1=cos(1.*(1./cos(x)));
   
3. y2=cos(2.*(1./cos(x)));
   
4. y3=cos(3.*(1./cos(x)));
   
5. y4=cos(4.*(1./cos(x)));
   
6. y5=cos(5.*(1./cos(x)));
   
7. plot(x,y1,x,y2,x,y3,x,y4,x,y5);
   
8. legend('m=1','m=2','m=3','m=4','m=5');
   
9. title('Chebyshev');
   
10. xlabel('X'),ylabel('Y');
    
11. grid;
    
12. x=linspace(-1,1);
    
13. 
    
14. for m=1:5
    
15.     y(m,:)=cos(m*acos(x));
    
16. end
    
17. plot(x,y);
    
18. 
    
19. legend('m=1','m=2','m=3','m=4','m=5')

复制代码

仅供参考

1. x=-pi:pi/100:pi;
   
2. y1=cos(1.*(1./cos(x)));
   
3. y2=cos(2.*(1./cos(x)));
   
4. y3=cos(3.*(1./cos(x)));
   
5. y4=cos(4.*(1./cos(x)));
   
6. y5=cos(5.*(1./cos(x)));
   
7. plot(x,y1,x,y2,x,y3,x,y4,x,y5);
   
8. legend('m=1','m=2','m=3','m=4','m=5');
   
9. title('Chebyshev');
   
10. xlabel('X'),ylabel('Y');
    
11. grid;
    
12. x=linspace(-1,1);
    
13. 
    
14. for m=1:5
    
15.     y(m,:)=cos(m*acos(x));
    
16. end
    
17. plot(x,y);
    
18. 
    
19. legend('m=1','m=2','m=3','m=4','m=5')

复制代码

好的，谢谢您的回答！害，但是它依旧报错Subscripted assignment dimension mismatch

新手小包菜 发表于 2022-6-27 12:37
好的，谢谢您的回答！害，但是它依旧报错Subscripted assignment dimension mismatch

可以运行啊没问题

1119093102 发表于 2022-6-27 13:50
可以运行啊没问题

好的，我刚刚又试了一下，谢谢您的回复！

运行没有问题!
x=-pi:pi/100:pi;
y1=cos(1.*(1./cos(x)));
y2=cos(2.*(1./cos(x)));
y3=cos(3.*(1./cos(x)));
y4=cos(4.*(1./cos(x)));
y5=cos(5.*(1./cos(x)));
plot(x,y1,x,y2,x,y3,x,y4,x,y5);
legend('m=1','m=2','m=3','m=4','m=5');
title('Chebyshev');
xlabel('X'),ylabel('Y');
grid;
x=linspace(-1,1);

for m=1:5
    y(m,:)=cos(m*acos(x));
end
plot(x,y);

legend('m=1','m=2','m=3','m=4','m=5')