Why each time algorithm "interior point" is shown in output even if I use different algorithm?

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Sadiq Akbar 2021-4-22

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https://ww2.mathworks.cn/matlabcentral/answers/809465-why-each-time-algorithm-interior-point-is-shown-in-output-even-if-i-use-different-algorithm

评论： Sadiq Akbar 2021-4-22

采纳的回答： Alan Weiss

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My fitness function is as below:

function out=myfitness(b)
  u = [1 2 3 4];
  out1 = u-b;             
  out = sum(out1.^2,2);
end

When I use the following code

clear all
clc
 FUN = @myfitness;
 %OPTIONS =optimoptions('fmincon','Algorithm','sqp'); % For SQP
 %OPTIONS =optimoptions('fmincon','Algorithm','sqp-legacy'); % For SQP-Legacy
 %OPTIONS =optimoptions('fmincon','Algorithm','trust-region-reflective'); % For Trust-region reflective
 OPTIONS =optimoptions('fmincon','Algorithm','active-set'); % For Active Set
 
 xo = [pi/2 pi/2 pi/2 pi/2];   % Starting point
%[x,fval] = patternsearch(ObjectiveFunction,x0); % For patternsearch
[x,fval,exitflag,output]= fmincon(FUN,xo);

It gives me my result. But when I check output variable "output", I see that each time "interior-point" is written in the algorithm inspite of the fact I use active-set or sqp or sqp-legacy i.e.,

output = 
  struct with fields:
         iterations: 2
          funcCount: 15
    constrviolation: 0
           stepsize: 2.9075
          algorithm: 'interior-point'
      firstorderopt: 3.9890e-08
       cgiterations: 0
            message: 'Local minimum found that satisfies the constra…'
            
            