Plot implicit function with the summation inside

Question

Yuriy Yerin 2020-3-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513554-plot-implicit-function-with-the-summation-inside

编辑： Yuriy Yerin 2020-3-28

Hello.

I'm trying to plot an implicit trancendental function with the summation inside the expression. Here my code:

function z=mu_ring
t=0.25;
G=0.0;
n=1:10000;
z1=@(w_c,mu) 1+w_c/pi*sum((-1).^n/n.*2*pi^2*n.*t./w_c*1./sinh(2*pi^2*n*t./w_c).*sin(2*pi*n*mu./w_c).*cos(pi*n).*exp(-2*pi*n.*G./w_c))-mu;
fimplicit(z1,[0.01 10 0 10],'MeshDensity',100,'LineWidth',3,'Color','red')
set(gca,'FontName','Times New Roman','FontSize',34)
xlabel('w_c','FontName','Times New Roman','fontsize',34,'fontweight','b');
ylabel('\mu','FontName','Times New Roman','fontsize',34,'fontweight','b');
grid on
end

After the execution I got a horizontal line with mu=1 instead something like that

Thank you in advance.

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Answer 1

Peng Li 2020-3-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513554-plot-implicit-function-with-the-summation-inside#answer_422490

在 MATLAB Online 中打开

z1 = @(w_c, mu) 1 + w_c / pi ...
    * sum((-1).^n / n .* 2 * pi^2 * n .* t ... % are you sure that the first / and the second to last * here correct or they should be ./ and .*?
    ./ w_c ...
    * 1 ./ sinh(2 * pi^2 * n * t ./ w_c) ...
    .* sin(2*pi*n*mu ./ w_c) ...
    .* cos(pi*n) ...
    .* exp(-2*pi*n.*G ./ w_c)) ...
    - mu;