defining step size for levenberg-marquardt optimisation

I am trying to define a starting step size for levenberg-marquardt optimisation as following. However, matlab throws an error when it executes this line. Please suggest what am I doing wrong. Best Wishes.

    options = optimoptions(@lsqcurvefit,'Algorithm',{'levenberg-marquardt',0.001},...
                           'Display','iter','Diagnostics','on','FunValCheck','on',...
                           'ScaleProblem','Jacobian','MaxIter',1e22,'TolFun',1e-22,...                                                                                            
                           'TolX',1e-22,'MaxFunEvals',1e22);

    Error using optimoptions (line 114)
    Too many outputs requested.  Most likely cause is missing [] around left hand side that has  a comma separated list expansion.

Answer 1

[Alan Weiss]

You have hit a bug in optimoptions. Currently, optimoptions does not handle the cell array form of the Algorithm option. This bug will be fixed in a future release.

Meanwhile, I suggest that you do the following:

• Use optimset for creating your options
• Use sensible tolerances: set TolFun to 1e-10 or so, the same with TolX

Sorry you got bit by a bug.

Alan Weiss

MATLAB mathematical toolbox documentation

[Anuj Anand]

many thanks for your reply.