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: conf.m
    path of file: ./repos/SMBO_TeachingTool/McCormickDifferentRangeFn
    
    the code of the file until where you have to start completion: %==========================================================================
% A modular code for teaching Surrogate Modeling-Based Optimization
% Author: Yong Hoon Lee (ylee196@illinois.edu)
%===================================================
    
function pc = conf()
    pc.nvar = 2;                % Number of variables
    pc.lb = [-1.5,-3];          % Lower bounds
    pc.ub = [5.5,4];              % Upper bounds
    pc.fs_g = 0.8;              % Shrink factor for global sample range
    pc.xtrue = [-0.547197612064673,-1.547197544523366];
                                % True soltuion in x (for comparison)
    pc.ftrue = -1.913222954981030;
                                % True solution in f (for comparison)
end