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: TF.m
    path of file: ./repos/d2d/arFramework3/ThirdParty/strike-goldd/STRIKE-GOLDD/MEIGO64/MEIGO/examples
    
    the code of the file until where you have to start completion: classdef TF
% TESTFUNCTION Different toy test functions.
%
% There exist ample other test functions widely used to test optimization
% algorithms in problem
    
function [fval] = f_hyperellipse(x)
        % typical domain: [-66,66]
        % global minimum: [0] at [0,...,0]
            dim = length(x);
            
            fval = 0;
            for j = 1:dim
                fval = fval + j*x(j)^2;
            end