error using writetable. txt is a unrecognized file extension. use the FileType parameters to specify the file type

Hi everyone,

When I'm running an experiment, I save all my results in a table named "Data" for each trial. After finishing the whole experiment, I want to save this Data table under the name of the experiment and subject number (for example, MTST-099) and save it as a text document.

First, I put a function named WriteData as shown in below

function WriteData(ExpInfo,SubInfo,Data)

writetable(Data,SubInfo.fileName,'Delimiter','tab');

end

In this function, there is a built-in function named writetable which I have problems with.

function writetable(a,filename,varargin)
%   Copyright 2012-2014 The MathWorks, Inc.

if nargin < 2
    tablename = inputname(1);
    if isempty(tablename)
        tablename = 'table';
    end
    filename = [tablename '.txt'];
end
write(a,filename,varargin{:})

When I tried to run this function(WriteData) to save the results, it returned something like

.Txt is a unrecognized file extension. use the FileType parameters to specify the file type ( as shown in picture).

The computer I used does not install Excel, is this the problem? Or the version is too odl-fashion?

Please help, I really have not idea what to do.

Thanks!