why the code is incorrect? and where is incorrect? Matlab told me the function is incorrect, why?

fun = 2*exp(-x)+sin(x); % function

x0 = [3 4]; % initial interval

x = fzero(fun,x0)

Answer 1

[Stephen23]

"why the code is incorrect?"

FZERO expects its first input argument to be a function handle:

https://www.mathworks.com/help/matlab/function-handles.html

"and where is incorrect?"

You did not define a function handle, just like FZERO requires. I fixed that for you:

fun = @(x) 2*exp(-x)+sin(x);
%     ^^^^ create anonymous function, FUN is its handle.
x0 = [3 4];
x = fzero(fun,x0)

x = 3.2215

https://www.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html

[Yufan]

Thanks!