(adsbygoogle = window.adsbygoogle || []).push({}); Error running optimization. Inputs must be a scalar and a square matri

I am trying to use fminunc using optimtool. But i got the error

Error running optimization.

Inputs must be a scalar and a square matrix.

this is the function i typed in the editor.

function F = fun(x)

F = -0.2662*x^6 + 48.19*x^5 - 3424.2*x^4 + 121708*x^3 - 2*e^6*x^2 + 2*e^7*x - 6*e^7;

end

i am not sure if this is a simple problem in matlab..i just want to optimize it using fminunc..i am new to matlab and there are a lot of things i do not understand.can you help me?

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# [Matlab] Error running optimization.

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