Error "Too many output arguments" from fmincon

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sxj
sxj 2019-6-18
评论： sxj 2019-6-19
Hallo, everyone, I am using fmincon to solve an optimization problem. The main code is shown as below:
x = fmincon(@(x)e1_funcOptimal(x), x_0,[], [], [], [], -10, 10, @(x)e1_consOptimal(x), options);
where e1_funcOptimal(x) is the function provided the objective function for the optimization, and e1_consOptimal(x) is the constraint conditions which x need to satisfy.
The e1_funcOptimal(x) function is shown as below:
tol = 1.0E-13;
options = optimset( ...
'Display', 'off', ...
'GradObj', 'on', ...
'GradConstr', 'on', ...
'DerivativeCheck', 'off', ...
'FinDiffType', 'central', ...
'TolFun', tol, ...
'TolX', tol, ...
'TolCon', tol, ...
'algorithm', 'active-set', ...
'MaxFunEvals', inf, ...
'MaxIter', 5000);
function obj = e1_funcOptimal(x)
obj = -x(1,10);
% or obj = -x(10)
% end
It means that I choose the negative value of one of the inputs as objective function.
The error messsage is that
Error using e1_funcOptimal
Too many output arguments.
Error in @(x)e1_funcOptimal(x)
Error in fmincon (line 561)
[initVals.f,initVals.g] = feval(funfcn{3},X,varargin{:});
Caused by:
Failure in initial objective function evaluation. FMINCON cannot continue.
How could I fix the problem. Thanks for reading.
  4 个评论
显示 2更早的评论
Walter Roberson
Walter Roberson 2019-6-18
Please show your options.
I predict that you configured in a way that requires a Jacobian to be output as the second output of your objective function.
sxj
sxj 2019-6-18
hey, Walter, I have just upload the options. Do you mean I choose 'on' for the option "GradObj'' and 'GradConstr' and need to switch them to 'off'?

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采纳的回答

Matt J
Matt J 2019-6-18
编辑：Matt J 2019-6-18
Do you mean I choose 'on' for the option "GradObj'' and 'GradConstr' and need to switch them to 'off'?
Either switch them off or provide the gradients, e.g.,
function [obj,grad] = e1_funcOptimal(x)
obj = -x(1,10);
if nargout>1
grad=zeros(size(x));
grad(1,10)=-1;
end
end

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