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: isequal.m
    path of file: ./repos/chebfun/@ballfunv
    
    the code of the file until where you have to start completion: function b=isequal(f, g)
%ISEQUAL Equality test for BALLFUNV.  
%   ISEQUAL(F, G) returns 1 then F and G are the same
%   BALLFUNV and 0 otherwise.

    
function b=isequal(f, g)
%ISEQUAL Equality test for BALLFUNV.  
%   ISEQUAL(F, G) returns 1 then F and G are the same
%   BALLFUNV and 0 otherwise.
%
%   See also ISZERO.

% Copyright 2019 by The University of Oxford and The Chebfun Developers.
% See http://www.chebfun.org/ for Chebfun information.

b = iszero(f-g);
end