Why cannot I obtain Levenberg-Marquardt as the default Algorithm for 'fit'?

According to https://www.mathworks.com/help/curvefit/fit.html?lang=en%C2%A0

"Input Arguments > Name-Value Pair Arguments > Nonlinear Least-Squares Options > Algoritm" 

the default is 'Levenberg-Marquardt'. 

However 'Trust-Region' is displayed by 'fitoptions' instead. 

Why is this happening ('Levenberg-Marquardt' is being changed to 'Trust-Region')? 

>> ft = fittype('10^(a*x+b)'); 

ans = fit(X,Y,ft,'StartPoint',[p(1),p(2)]); 

>> fitoptions(ft) 

Normalize: 'off' 

Exclude: [] 

Weights: [] 

Method: 'NonlinearLeastSquares' 

Robust: 'Off' 

StartPoint: [1x0 double] 

Lower: [1x0 double] 

Upper: [1x0 double] 

Algorithm: 'Trust-Region' 

DiffMinChange: 1.0000e-08 

DiffMaxChange: 0.1000 

Display: 'Notify' 

MaxFunEvals: 600 

MaxIter: 400 

TolFun: 1.0000e-06 

TolX: 1.0000e-06 

Answer 1

[MathWorks Support Team]

This is a documentation bug.

The default algorithm for 'fit' is 'Trust-Region' since 2002.