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: isPeriodicTech.m
    path of file: ./repos/chebfun/@chebfun2v
    
    the code of the file until where you have to start completion: function out = isPeriodicTech(f)
%ISPERIODICTECH   Test if a CHEBFUN2V object is built upon a TECH of 
%periodic functions.

    
function out = isPeriodicTech(f)
%ISPERIODICTECH   Test if a CHEBFUN2V object is built upon a TECH of 
%periodic functions.
%   out = ISPERIODICTECH(F) returns logical true if the columns and rows of
%   F are made of a TECH of periodic functions and false otherwise.

% Copyright 2017 by The University of Oxford and The Chebfun Developers.
% See http://www.chebfun.org/ for Chebfun information.

for j = 1:f.nComponents
    out(j) = isPeriodicTech(f.components{j});
end