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')

>>

Answer 1

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仅供参考

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')