Equation is convergent but unable to extract the output

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Sun Heat
Sun Heat 2022-5-20
编辑： Torsten 2022-5-20
hello friends,
i run the below code and found that the equation is 'convergent', but i am unable to extract the output.
clc;close all;clear all;
syms m
k=360; h=0.562; theta=35;
alpha_m=((-1)*360*sqrt(1-((m^2)*(sind(theta)^2))));
term=(k*(1-(exp(-2*alpha_m*h)))/alpha_m);
y = vpa(symsum(term, m, 2, Inf));
if isinf(y)
fprintf('divergent\n');
else
fprintf('convergent\n');
end
I used
syms m
k=360; h=0.562; theta=35;
alpha_m=((-1)*360*sqrt(1-((m^2)*(sind(theta)^2))));
term=(k*(1-(exp(-2*alpha_m*h)))/alpha_m);
y = symsum(term, m, 2, Inf);
AA=double(y) % but it didn't work
Please help me. Thanks in advance.

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采纳的回答

Torsten
Torsten 2022-5-20
编辑：Torsten 2022-5-20
The real part of y seems to converge, the imaginary part doesn't.
k=360; h=0.562; theta=35;
alpha_m = @(m)((-1)*360*sqrt(1-((m.^2)*(sind(theta)^2))));
term = @(m)(k*(1-(exp(-2*alpha_m(m)*h)))./alpha_m(m));
m = 2:10000;
y = cumsum(term(m))
plot(m,[real(y);imag(y)])

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