fminunc error message multiple variables

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mathxaz 2019-1-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/438456-fminunc-error-message-multiple-variables

评论： Stephan 2019-1-6

采纳的回答： Stephan

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Hello everyone!

I want to minimize the following function that I wrote:

function ll = ll_wbl(A, N, Y, X, sum_ll)
%A=theta, A(1)=beta, A(2)=kappa
lambda=exp(X*A(1));
 
ll=N*log(A(2))+(A(2)-1).*log(Y)-A(2).*log(lambda)-(Y./lambda).^A(2);
 
ll=-ll;
 
if sum_ll==true
    ll=sum(ll);    
end 
 
%grad=sum(Y.*X);
end 

over the vector A by using fminunc:

clc; clear;
 
data = xlsread('ema1996_reduced.xls', 'Sheet1');
 
UNDUR = data(:,1);
UI = data(:,2);
RR = data(:,3); 
RRUI=data(:,4);
DR=data(:,5);
DRUI=data(:,6);
LWAGE=data(:,7);
TENURE=data(:,8);
NONWHITE=data(:,9);
 
 
% Store as Y and X matrices
N = size(data, 1);
Y = UNDUR;
X = [ones(N, 1) UI RR RRUI DR DRUI LWAGE TENURE NONWHITE];
 
 
 
A0=zeros(2,1);
 
% Optmizer settings
options = optimoptions(@fminunc, 'Algorithm', 'quasi-newton');
 
% Estimate model
[A, fval, exitflag, output ] = fminunc(@ll_wbl, A0, options, Y, X, true);

Unfortunately, this doesn't work out somehow.

I get the following error:

Not enough input arguments.
Error in ll_wbl (line 9)
if sum_ll==true
Error in fminunc (line 278)
        f = feval(funfcn{3},x,varargin{:});
Caused by:
    Failure in initial objective function evaluation. FMINUNC cannot continue.

I don't understand what's going on here since I am a newbie. Maybe someone can help me out?

Thanks in advance!

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采纳的回答

Stephan 2019-1-6

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/438456-fminunc-error-message-multiple-variables#answer_355190

Hi,

fminunc is only able to pass the optimization variable to the objective function. Since your function needs additionally input arguments, you need to pass them to the objective function.

Read here:

https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html

Best regards

Stephan