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: celes_solver.m
    path of file: ./repos/celes/src/classes
    
    the code of the file until where you have to start completion: %  Copyright (c) 2017, Amos Egel (KIT), Lorenzo Pattelli (LENS)
%                      Giacomo Mazzamuto (LENS)
%  All rights reserved.
%
%  Redistribution and use in source and binary forms, with or without
%  modification, are permitted provided that the following conditions are met:
%
%  * Redistributions of source code must retain the above copyright notice, this
%    list of conditions and the following disclaimer.
%
%  * Redistributions in binary form must reproduce the above copyright notice,
%    this list of conditions and the following disclaimer in the documentation
%    and/
    
function handle): master matrix multiply operator M*
        %> @param rhs (float array): right hand side of linear system
        %> @param Optional: y0 (float array): initial guess for solution vector
        %> @param Optional: verbose (logical): If true (default), display
        %>        detailed timing information
        %> @return y = M\rhs, an approximation to the solution of the linear system
        % ======================================================================
        function [value,convergenceHistory] = run(obj,mmm,rhs,varargin)
            if isempty(varargin)
                initial_guess = gather(rhs);
            else
                initial_guess = varargin{1};
            end