You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: convNlopt.m
    path of file: ./repos/OPTI/Utilities/opti
    
    the code of the file until where you have to start completion: function mprob = convNlopt(prob,opts)
%CONVNLOPT Convert OPTI problem to NLOPT Nonlinear problem
%
%   mprob = convNlopt(prob,opts)

%   Copyright (C) 2011 Jonathan Currie (Control Engineering)

%Ensure all args passed
    
function '...
                                  'but you have supplied one. Try using a derivative enabled algorithm instead '...
                                  '(check nloptSolver)'],upper(setOpts.algorithm));
end
% Check if unconstrained with not an unconstrained solver
if(~prob.iscon && ~uncon)
    if(prob.numdif.grad) %check if we are using numerical derivative information (bad? we will use deriv free opt with nlopt if estimated)
        alg = 'LN_PRAXIS'; %seems to work well - you are welcome to change the default!
    else
        alg = 'LD_LBFGS'; %also seems to work ok
    end    
    if(warn)
        optiwarn('opti_nlopt:uncon','Conv NLOPT - The currently selected NLOPT algorithm (%s) cannot solve unconstrained problems, using %s instead',...
                upper(nloptSolver(mprob.options.algorithm)),alg);
    end
    [~,ineq,eq,~,~,deriv] = nloptSolver(alg); %recheck
    mprob.algorithm = nloptSolver(alg);
end