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: printDescription.m
    path of file: ./repos/chebfun/@chebguiExporterPDE
    
    the code of the file until where you have to start completion: function printDescription(fid, expInfo)
%PRINTDESCRIPTION    Print problem description when problems are exported.
%
% Calling sequence:
%   PRINTDESCRIPTION(FID, EXPINFO)
% where
%   FID:        ID of a file-writing stream.
%   EXPINFO:    Struct containing information for printing the problem.

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

% Extract info from the expInfo struct
deInput = expInfo.deInput;
a = expInfo.a;
b = expInfo.b;
xName = expInfo.xName;
tName = expInfo.tName;
tt = expInfo.tt;
lbcInput = expInfo.lbcInput;
rbcInput = expInfo.rbcInput;
allVarString = expInfo.allVarString;
periodic = expInfo.periodic;


    
function printDescription(fid, expInfo)
%PRINTDESCRIPTION    Print problem description when problems are exported.
%
% Calling sequence:
%   PRINTDESCRIPTION(FID, EXPINFO)
% where
%   FID:        ID of a file-writing stream.
%   EXPINFO:    Struct containing information for printing the problem.

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

% Extract info from the expInfo struct
deInput = expInfo.deInput;
a = expInfo.a;
b = expInfo.b;
xName = expInfo.xName;
tName = expInfo.tName;
tt = expInfo.tt;
lbcInput = expInfo.lbcInput;
rbcInput = expInfo.rbcInput;
allVarString = expInfo.allVarString;
periodic = expInfo.periodic;

% Print the PDE
fprintf(fid, '%% Solving\n');
for k = 1:numel(deInput)
    fprintf(fid, '%%   %s,\n', deInput{k});
end

% Eval the TT string, so that we can find the initial and final times:
tmpt = eval(tt);
fprintf(fid, '%% for %s in [%s,%s] and %s in [%s,%s]', xName, a, b, tName, ...
    num2str(tmpt(1)), num2str(tmpt(end