Problems with line plots

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cheb 2020-11-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/645933-problems-with-line-plots

评论： Cris LaPierre 2020-11-12

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Hi there,

can someone please tell me why my program outputs such a line?

it should look like this:

This is my code:

   [u,v] = meshgrid(linspace(-2.5,2.5,40),linspace(-2.5,2.5,40));
    x = u-(u.^3/3)+u.*v.^2;
    y = -v+(v.^3/3)-v.*u.^2;
    z = u.^2-v.^2;
    mesh(x,y,z)
    hold on
    axis equal;
    [t,X] = ode45(@Enneper,[0,4*pi],[0,.1,0,.1]);
    u = X(:,1);
    v = X(:,3);
    x = u-(u.^3/3)+u.*v.^2;
    y = -v+(v.^3/3)-v.*u.^2;
    z = u.^2-v.^2;
    plot3(x,y,z,'color','r','LineWidth',1);  
function xprime = Enneper(t,x)
    xprime = zeros(4,1);
    xprime(1) = x(2);
    xprime(2) = (2.*x(1).*x(4).^2)/(x(1).^2+x(3).^2+1)-(2.*x(1).*x(2).^2)/(x(1).^2+x(3).^2+1)-(4.*x(3).*x(2).*x(4))/(x(1).^2+x(3).^2+1);
    xprime(3) = x(4);
    xprime(4) = (2.*x(3).*x(2).^2)/(x(1).^2+x(3).^2+1)-(2.*x(3).*x(4).^2)/(x(1).^2+x(3).^2+1)-(4.*x(1).*x(2).*x(4))/(x(1).^2+x(3).^2+1);
end  

Thanks!

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回答（1 个）

Cris LaPierre 2020-11-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/645933-problems-with-line-plots#answer_542658

You create that line with your plot3 command. If it should be doing what is shown in your other images, you may need to check your equations for x, y, and z.