Unrecognized field name "FinDiffRelStep"

Hello everyone:

I am trying to replicate a paper from 2019, when running the fmincon optimization routine, I get the following error:

Unrecognized field name "FinDiffRelStep".

Error in finitedifferences

Error in nlconst (line 336)

finitedifferences(XOUT,funfcn{3},confcn{3},lb,ub,f, ...

Error in fmincon (line 759)

nlconst(funfcn,X,l,u,full(A),B,full(Aeq),Beq,confcn,options,defaultopt, ...

It referes to the following section of the gradient computation in the main loop:

% Compute finite difference gradients

if serialFinDiff % Call serial finite-differences code

if ~isFseminf

if DerivativeCheck || (~flags.grad && ~flags.gradconst) % No objective gradients,

% no constraint gradients

[gf,gnc(:,nonlIneqs_idx),gnc(:,nonlEqs_idx),numEvals] = ...

finitedifferences(XOUT,funfcn{3},confcn{3},lb,ub,f, ...

nc(nonlIneqs_idx),nc(nonlEqs_idx),1:numberOfVariables, ...

finDiffOpts,sizes,gf,gnc(:,nonlIneqs_idx), ...

gnc(:,nonlEqs_idx),finDiffFlags,[],varargin{:});

By setting options = optimset('Largescale','off','display','iter') in the main code "FinDiffRelStep" is generated but afterwards not recognized in nlconst. What can I do to run nlconst without FinDiffRelStep?

Thanks

Daniel

[Torsten]

The MATLAB version suitable for the code does not run on your machine ?

[Daniel]

Hello Torsten,

Yes it does, up to nlconst. In a different project we are working on we can run the fmincon optimization routine without a problem. I am using MATLABR2022a but the code was written in 2006. I am not sure if it is a version problem.

[Torsten]

What I wanted to say is: As the first option, I'd run a code for the MATLAB version it was written for instead of making modifications to the code. Usually, necessary modifications grow like a cascade.