%ROBOT Constructor function for robot object.%   R = ROBOT%   Creates a new robot object with default values.%%   R = ROBOT(R)%   Copies and returns the robot object R.%%   R = ROBOT(TYPESTR,NAME,FORMTYPE,T)%   Creates a new robot object with values%    TYPESTR : type string%       NAME : name string%   FORMTYPE : form type identifier according to DRAWROBOT%          T : discrete time index or timestamp%%   The robot class is a child class of the base class ENTITY%   and in turn base class for all robot classes.%%   Example:%      r = robot('differential drive robot',1,'Piggy',4,now);%%   See also ENTITY, ROBOTDD, DRAWROBOT.% Copyright (c) 2004, CAS-KTH. See licence file for more info.% v.1.0, Nov. 2003, Kai Arrasfunction r = robot(varargin);switch nargin,  case 0,    % if no input arguments, create a default object    r.name = '';    r.formtype = 0;    r.t = 0;    e = entity('robot',0);    r = class(r,'robot',e);  case 1,    % if single argument of class robot, return it    if (isa(varargin{1},'robot'))      r = varargin{1};     else      error('robot: Input argument not a robot object')    end  case 4,    % create object using specified values    r.name = varargin{2};    r.formtype = varargin{3};    r.t = varargin{4};    e = entity(varargin{1},0);  % robots have id = 0 per default    r = class(r,'robot',e);  otherwise    error('robot: Wrong number of input arguments')end