MATLAB: I have an input which saves previous answers that have been given, how can i set initial values that only apply once

Question

This is my code (for this part)

% To be inputted by user
prompt = {'Mass:','Angle of Slope:','Car Wheelbase:','Car Width:','Car Length:','Car Height:'};
title = 'Input';
dims = [1 35];
definput = {Mass,Degrees,Wheelbase,Width,Length,Height};
Answer = inputdlg(prompt,title,dims,definput);
Mass = Answer{1};
Degrees = Answer{2};
Wheelbase = Answer{3};
Width = Answer{4};
Length = Answer{5};
Height = Answer{6};

I've tried using isempty and exist but both return errors (Might be doing it wrong)

Any help is much appreciated 🙂

Answer 1

if exist('Mass','var') == 1
        Mass = Mass;
else
        Mass = char(1);
end

This seems to do the trick