Error code : Error using optimoptions (line 105)?

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amine&&
amine&& 2016-7-7
评论： amine&& 2016-7-7
when I enter the following command :
options = optimoptions('fminunc','Algorithm','trust-region','SpecifyObjectiveGradient',true);
Matlab displays the following error :
Error using optimoptions (line 105)
'SpecifyObjectiveGradient' is not an option for FMINUNC.
A list of options can be found on the FMINUNC documentation page.
I don't know this origin?
Thanks!

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Walter Roberson
Walter Roberson 2016-7-7

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