Stutzer index (stutzer performance ratio)

I'm trying to obtain a result from this formula: http://www.activetradermag.com/assets/news/Web%20extra%20images/stutzer1-1209.gif

However, i'm going somewhere detrimentally wrong

I run this matlab file, with stutzer.xls just having 5 random returns

% x0 = [0];    % Starting guess
x0=1;
returns=xlsread('stutzer.xls','Sheet1','A1:A5');

% optimopt = optimset('LargeScale','off');
%   optimopt = optimset('fminsearch'); 
%     optimopt = optimset('algorithm','interior-point');
%        optimopt.MaxIter=9000000;
%          optimopt.MaxFunEvals=9000000;
%             optimopt.TolFun=1e-6;
%                optimopt.TolX=1e-6;
%                  optimopt.Display='final';
%             optimopt.HessUpdate='bfgs';
%              optimopt.Tolcon=1e-6;
%             optimopt.Diagnostics='off';

[result] = fminunc(@objfun,x0,options);
% x = fminunc(@(x) objfun(x,returns),options)
% x = fminsearch(@(x) objfun(x,returns),options)

and the OBJfun is written here;

function f = objfun(x,returns)

for i=1:5
returns=xlsread('stutzer.xls','Sheet1','A1:A5');
Omega = (-log((1/100)*(exp((x*returns(i,1))))));
Omega(:,i)=Omega;
f = sum(Omega);
end

I however do not get any results :( What am i doing wrong?

[Oleg Komarov]

Comment out the

returns=xlsread('stutzer.xls','Sheet1','A1:A5');

in objfun() function.