Error in optimization process
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I am trying to fit a gumbel distribution on a series of data. So I want to minimize the negative of maximum likelihood by optimizing two variables var(1) and var(2). This is my code:
X=xlsread('file.xlsx');
options = optimset('MaxFunEvals',1000,'FinDiffType','central');
options=optimset(options,'Display','iter','MaxIter',1000,'TolCon',1e-6);
lb=0;
ub=Inf;
var=zeros(2,1);
x = fmincon(@(var)Gumbel(var,X),1,1,[],[],[],[],lb,ub,[],options);
and my Gumbel function is:
function f=Gumbel(var, X)
f=-sum(log((1./var(1)).*exp(-(X-var(2))./var(1)-exp(-(X-var(2))./var(1)))))
Can someone help me why I am getting errors?! Thanks
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