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: planar3link.m
    path of file: ./repos/Robotics-Toolbox/rvctools/release10.3.1/robot/demos/planar3link/@planar3link
    
    the code of the file until where you have to start completion: classdef planar3link < SerialLink
 
	properties
	end
 
	methods
		function ro = planar3link()
			objdir = which('planar3link');
			idx = find(objdir == filesep,2,'last');
			objdir = objdir(1:idx(1));
			 
			
    
function ro = planar3link()
			objdir = which('planar3link');
			idx = find(objdir == filesep,2,'last');
			objdir = objdir(1:idx(1));
			 
			tmp = load(fullfile(objdir,'@planar3link','matplanar3link.mat'));
			 
			ro = ro@SerialLink(tmp.sr);
			 
			 
		end