Does "fsolve" still avaliable for sloving the nonlinear equation?

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Mark 2021-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/839600-does-fsolve-still-avaliable-for-sloving-the-nonlinear-equation

评论： Sulaymon Eshkabilov 2021-5-26

采纳的回答： Sulaymon Eshkabilov

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I would like to slove the nonlinear equation above and I use matlab to code below but the command window showed: Undefined function 'fsolve' for input arguments of type 'function_handle'.

How should I use the fsolve function or is there any other way to solve these nonlinear equation?

Thank you very much!

clc; clear;
f=@(x) [2.*x(1)-x(2)-exp(-x(1));-x(1)+2.*x(2)-exp(-x(2))];
fsolve(f,[-5,-5])

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采纳的回答

Sulaymon Eshkabilov 2021-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/839600-does-fsolve-still-avaliable-for-sloving-the-nonlinear-equation#answer_708765

Hi,

In order to employ fsolve() function, you should have optimization toolbox installed in your computer.

fsolve is part of optimization toolbox and thus, you have gotten such an error message.

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Mark 2021-5-25

After I install the optimization toolbox, it works! Thanks a lot!!

Sulaymon Eshkabilov 2021-5-26

Most welcome! It is a pleasure to help.

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Mathematics and Optimization Optimization Toolbox Optimization Results Solver Outputs and Iterative Display

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