How to find the roots of a non-polynomial equation in terms of symbolic variables ?

Question

Abhay Singh 2014-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/157484-how-to-find-the-roots-of-a-non-polynomial-equation-in-terms-of-symbolic-variables

回答： Walter Roberson 2024-8-7，22:06

want to find the values of 'K' for which the function (D) becomes zero. 'L' and 'a' are the constants. Code:

syms A B L K a
D = [cosh(K*L)-cos(K*L), sinh(K*L)-sin(K*L); sinh(K*L)+sin(K*L)+K*a*L*(cosh(K*L)+cos(K*L)), cosh(K*L)-cos(K*L)+K*a*L*(sinh(K*L)+sin(K*L))];
d = det(D)
fzero(@(K) d, 10)

Error using fzero (line 309) Function value at starting guess must be finite and real.

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Denel 2024-8-7，20:26

Have you tried different starting values for the fzero() function? The error-message states that your starting value isn't valid, since the function's value in that point (10), is probably infinite or complex.

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