How to solve non linear equations with three variables? I don't think i could use Newton rapson method. I don't even know how to approch this problem.

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sivalogan satchithanandamoorthy 2017-8-8

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https://ww2.mathworks.cn/matlabcentral/answers/351978-how-to-solve-non-linear-equations-with-three-variables-i-don-t-think-i-could-use-newton-rapson-meth

回答： Krishna Bindumadhavan 2017-8-11

In the above equation following are the only unknowns: γ(Gamma),α(Alpha) and λ(Lambda). Is there any way i could solve the above equation for those unknown? E,ε_a, ε_o and σ_o are constant. I have three data points for σ and ε. Is there any way i could solve this problem? Your help would greatly appreciated.

sincerely

siva

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Answer 1

Krishna Bindumadhavan 2017-8-11

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https://ww2.mathworks.cn/matlabcentral/answers/351978-how-to-solve-non-linear-equations-with-three-variables-i-don-t-think-i-could-use-newton-rapson-meth#answer_277687

You may solve a system of non-linear equations using the fsolve function. For complete documentation please refer to the following link:

http://www.mathworks.com/help/optim/ug/fsolve.html

The example provided in the documentation outlines the approach for solving a two dimensional nonlinear system of equations; you should be able to extend this approach for solving a three dimensional nonlinear system of equations as well.