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/usr/share/matlab2tikz/private/versionString.m is in matlab2tikz 1.1.0-4.

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The actual contents of the file can be viewed below.

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function str = versionString(arr)
% Converts a version array to string
  if ischar(arr)
      str = arr;
  elseif isnumeric(arr)
      str = sprintf('%d.', arr);
      str = str(1:end-1); % remove final period
  end
end