Error in function handle using fminsearch

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Elianther
Elianther 2020-10-7
评论： madhan ravi 2020-10-7
I'm trying to solve the following maximization problem:
The proposed code is the following:
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
min = fminsearch(@f, x0); % Find minima
Where the function 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
Nevertheless, I get the following error when executed:
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);
The dPL function works correctly:
>> dPL([3.86, 0.045], st)
ans =
49.0302
Any ideas? Thanks.
  2 个评论
madhan ravi
madhan ravi 2020-10-7
Elianther why did you ask the SAME question TWICE?? DON’T waste others time by asking the same question multiple TIMES.

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采纳的回答

madhan ravi
madhan ravi 2020-10-7
min3 = fminsearch(f, x0);
  2 个评论
Elianther
Elianther 2020-10-7
Thanks. It was a very silly mistake. Anyway, could you elaborate on why is not neccesary tu put the "@" symbol?
madhan ravi
madhan ravi 2020-10-7
编辑：madhan ravi 2020-10-7
It was already put in f = @ why would you put it again? In that case y could use @(x) f(x).
I would suggest you to read https://www.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html

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