Error in fminsearch (line 200)

I'm trying to solve the following maximization problem:

Until now, the following code is my proposal:

clear;clc

st =  [1.312,1.314,1.479,1.552,1.700,1.803,1.861,1.865,1.944,1.958,1.966, 1.997,...
       2.006,2.027,2.055,2.063,2.098,2.14, 2.179,2.224,2.240,2.253, 2.270,2.272,...
       2.274,2.301,2.301,2.359,2.382,2.382,2.426,2.434,2.435, 2.478,2.490,2.511,...
       2.514,2.535,2.554,2.566,2.57, 2.586,2.629,2.633, 2.642,2.648,2.684,2.697,...
       2.726,2.770,2.773,2.800,2.809,2.818,2.821, 2.848,2.88, 2.954,3.012,3.067,...
       3.084,3.090,3.096,3.128,3.233,3.433, 3.585,3.585];   % Data
x0 = [1,1];                                                 % Initial search
f    = @(x)dPL(x, st);                                      % Passing arguments to function handle
min3 = fminsearch(@f, x0);

where dPL is given by

function loglik = dPL(x, data)
mu = x(1); sigma = x(2);
    loglik = length(data)*(log(mu) + 2*log(sigma) - log(sigma+1)) + sum(log(1 + data.^mu)) + (mu - 1)*sum(log(data)) - sigma*sum(data.^mu);
    loglik = -loglik;
end

I get the following error:

Unrecognized function or variable 'f'.

Error in fminsearch (line 200)
fv(:,1) = funfcn(x,varargin{:});

Error in min_test (line 31)
min3 = fminsearch(@f, x0);

Evaluation of dPL function operates adequately and as expected e.g.:

>> dPL([3.86, 0.045], st)

ans =

   49.0302

Thanks.

Answer 1

[Star Strider]

I did not run this.

However ‘f’ is already a function handle, so try:

min3 = fminsearch(f, x0);

.