Unable to find explicit solution

2 次查看（过去 30 天）

SooShiant 2020-12-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/677508-unable-to-find-explicit-solution

评论： David Goodmanson 2020-12-4

I have MATLAB R2020a and need to solve the equation below:

syms x P R F A
eqn = (F^2*P^(R - 1)*x)/(2*(x^R - P^R + P^R*R))==A 
S = solve(eqn,x)

But I receive this:

Warning: Unable to find explicit solution. For options, see help. 
> In sym/solve (line 317) 
 
S =
 
Empty sym: 0-by-1

Is there anyway to solve that equation or any idea?

5 个评论
显示 3更早的评论隐藏 3更早的评论

SooShiant 2020-12-4

Great, You Are Genius. How to add a reputation for you?

David Goodmanson 2020-12-4

在 MATLAB Online 中打开

Hi S^2, thanks for the thought, but you can't add reputation points because I posted it as a comment and not an answer, besides which what I said did not tell the whole story. fzero will also work on

(F^2*P^(R - 1)*x)/(2*(x^R - P^R + P^R*R)) - A

which is closer to the original eqn. With that you just have to be a bit more careful with a starting guess region, because the denominator can go to zero (depending on the constants), sending the function to infinity.

请先登录，再进行评论。

请先登录，再回答此问题。