Matlab中的屏障函数

Question

Where can I find the implementation of barrier function in Matlab? I am trying to see how the algorithm interior-point is implemented, and this is what I found in the end of fmincon.m

elseif strcmpi(OUTPUT.algorithm,interiorPoint)
    defaultopt.MaxIter = 1000; defaultopt.MaxFunEvals = 3000; defaultopt.TolX = 1e-10;
    defaultopt.Hessian = 'bfgs';
    mEq = lin_eq + sizes.mNonlinEq + nnz(xIndices.fixed); % number of equalities
    % Interior-point-specific options. Default values for lbfgs memory is 10, and 
    % ldl pivot threshold is 0.01
    options = getIpOptions(options,sizes.nVar,mEq,flags.constr,defaultopt,10,0.01); 

    [X,FVAL,EXITFLAG,OUTPUT,LAMBDA,GRAD,HESSIAN] = barrier(funfcn,X,A,B,Aeq,Beq,l,u,confcn,options.HessFcn, ...
        initVals.f,initVals.g,initVals.ncineq,initVals.nceq,initVals.gnc,initVals.gnceq,HESSIAN, ...
        xIndices,options,optionFeedback,finDiffFlags,varargin{:});

So I want to see what's in barrier but failed.

edit barrier.m

I got:

Answer 1

The barrier function is defined in a p-file (precisely located in MATLABROOT/toolbox/optim/optim/barrier.p ).

Unfortunately the point of p-files is exactly that they are obfuscated, ie you cannot read the source code. This is a recurent questio on SO, see this thread for instance.

I'm afraid you cannot read what's inside barrier . Maybe if you ask the Mathworks kindly they can give you some information on the content.

Best