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: mldivide.m
    path of file: ./repos/d2d/arFramework3/ThirdParty/StrucID/adimat/opt_derivclass/@adderiv
    
    the code of the file until where you have to start completion: function res= mldivide(s1, s2)
%ADDERIV/MLDIVIDE Solve an equation.
%
% Copyright 2001-2004 Andre Vehreschild, Institute for Scientific Computing   
%                     RWTH Aachen University

    
function res= mldivide(s1, s2)
%ADDERIV/MLDIVIDE Solve an equation.
%
% Copyright 2001-2004 Andre Vehreschild, Institute for Scientific Computing   
%                     RWTH Aachen University
% This code is under development! Use at your own risk! Duplication,
% modification and distribution FORBIDDEN!


if isa(s1, 'adderiv')
   % If the first argument is active, something wicked has happened.
   error('Never used!!! Bug found.');
else
   res= adderiv(s2);

   if res.dims==1
      tsolv= s1 \ [s2.deriv{:}];
      res.deriv = mat2cell(tsolv, size(tsolv, 1), repmat(size(s2.deriv{1}, 2),[res.ndd,1]));
   else
      for i= 1: res.ndd(1)
         tsolv= s1\ [s2.deriv{i,:}];
         p= size(s2.deriv{i,1}, 2);
         for c=0: res.ndd(2)-1
            res.deriv{i,c+1}= tsolv(:, (c*p+1): ((c+1)*p));
         end