Incorrect number or types of inputs and outputs for function 'isfinite'

Question

Weiying 2023-9-7

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2017981-incorrect-number-or-types-of-inputs-and-outputs-for-function-isfinite

评论： Weiying 2023-9-7

I want to solve this nonlinear system, but it always says in red: Incorrect number or types of inputs and outputs for function 'isfinite', and I'm a beginner I don't know how to fix it.

Could you please give me some advice? Thx.

x=fsolve('@system',[0 0])
Incorrect number or types of inputs or outputs for function 'isfinite'.

Error in fsolve (line 306)
if any(~isfinite(fuser)) 
function f=system(x)
f=[2*x(1)+x(2)+x(1)^3; x(1)+x(1)*x(2)+exp(x(1))];
end

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Answer 1

Florian Bidaud 2023-9-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2017981-incorrect-number-or-types-of-inputs-and-outputs-for-function-isfinite#answer_1304181

编辑：Florian Bidaud 2023-9-7

在 MATLAB Online 中打开

You need to remove the quotes

x=fsolve(@system,[0 0])
Equation solved.

fsolve completed because the vector of function values is near zero
as measured by the value of the function tolerance, and
the problem appears regular as measured by the gradient.
x = 1×2
   -0.3783    0.8108
function f=system(x)
f=[2*x(1)+x(2)+x(1)^3; x(1)+x(1)*x(2)+exp(x(1))];
end