vpasolve returning Empty sym: 0-by-1

2020 1 4
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更新时间：2020 1 4
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%initial parameters
A = 1.87.*10.^-9;
f = 189;
d = 1550;
k = 8.43.*10.^-5;
K = 4.68.*10.^5;
B = 1.11.*10.^-7;
P = 500;
syms j
eqn = j./((d.*exp(-j./k)-f.*exp(j.*K))./(1+(B./j).*(exp(j.*K)-exp(-j./k)))- P) - A == 0;
sol = vpasolve(eqn ,j)
I want to solve the unknown parameters j, please help me T_T

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Walter Roberson
Walter Roberson 2020-1-4

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sol = vpasolve(eqn, j, 1e-6)
The eqn has a singularity not far from that point; it is rapidly rising towards +infinity near there, and crosses through 0 as it does so.

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