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: plus.m
    path of file: ./repos/mtex/PoleFigureAnalysis/@PoleFigure
    
    the code of the file until where you have to start completion: function pf = plus(pf1,pf2)
% implements pf1 + pf2
%

    
function pf = plus(pf1,pf2)
% implements pf1 + pf2
%
% overload the + operator, i.e. one can now write pf1 + pf2 in order to
% add two pole figures
%
% See also
% PoleFigure/PoleFigure PoleFigure/minus PoleFigure/mtimes


if isa(pf1,'PoleFigure')
  pf = pf1;
else
  pf = pf2;
  pf2 = pf1;
end