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: DN_Fit_mle.m
    path of file: ./repos/hctsa/Operations
    
    the code of the file until where you have to start completion: function out = DN_Fit_mle(y,fitWhat)
% DN_Fit_mle    Maximum likelihood distribution fit to data.
%
% Fits either a Gaussian, Uniform, or Geometric distribution to the data using
% maximum likelihood estimation via the Matlab function mle

    
function out = DN_Fit_mle(y,fitWhat)
% DN_Fit_mle    Maximum likelihood distribution fit to data.
%
% Fits either a Gaussian, Uniform, or Geometric distribution to the data using
% maximum likelihood estimation via the Matlab function mle
% from the Statistics Toolbox.
%
%---INPUTS:
% y, the input data vector.
% fitWhat, the type of fit to do: 'gaussian', 'uniform', or 'geometric'.
%
%---OUTPUTS: parameters from the fit.

% ------------------------------------------------------------------------------
% Copyright (C) 2020, Ben D. Fulcher <ben.d.fulcher@gmail.com>,
% <http://www.benfulcher.com>
%
% If you use this code for your research, please cite the following two papers:
%
% (1) B.D. Fulcher and N.S. Jones, "hctsa: A Computational Framework for Automated
% Time-Series Phenotyping Using Massive Feature Extraction, Cell Systems 5: 527 (2017).
% DOI: 10.1016/j.cels.2017.10.001
%
% (2) B.D. Fulcher, M.A. Little, N.S. Jones, "Highly comparative time-series
% analysis: the empirical structure of time series and their methods",
% J. Roy. Soc. Interface 10(83) 20130048 (2013).
% DOI: 10.1098/rsif.2013.0048
%
% This function is free software: you can redistribute it and/or modify it under
% the terms of the GNU General Public License as published by the Free Software
% Foundation, either version 3 of the License, or (at your option) any later
% version.
%
% This program is distributed in the hope that it will be useful, but WITHOUT
% ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
% FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
% details.
%
% You should have received a copy of the GNU General Public License along with
% this program. If not, see <http://www.gnu.org/licenses/>.
% ------------------------------------------------------------------------------

%-------------------------------------------------------------------------------
% Check Inputs:
%-------------------------------------------------------------------------------
if nargin < 2
    fitWhat = 'gaussian'; % fit a Gaussian by default
end