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

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])

Answer 1

[Sulaymon Eshkabilov]

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.

[Mark]

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

[Sulaymon Eshkabilov]

Most welcome! It is a pleasure to help.