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: test_vertcat.m
    path of file: ./repos/chebfun/tests/diskfun
    
    the code of the file until where you have to start completion: function pass = test_vertcat( )
% test diskfun vertcat() command

    
function pass = test_vertcat( )
% test diskfun vertcat() command

f = diskfun( @(x,y) cos(x) );
F = [ f ; f ];   % check that this works
pass(1) = iszero(F(1) - f);

% Note that this does not work:
f = diskfun( @(x,y) cos(x) );
try
    F = [ f ; f; f ];
    pass(2) = 0;
catch
    pass(2) = 1;
end