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: MultiArgIn.m
    path of file: ./repos/Image-Harmonization-Dataset-iHarmony4/Xue et al/dependency/optprop/optutil
    
    the code of the file until where you have to start completion: function [err, argout, inshape, varargout] = MultiArgIn(dims, varargin)
%MULTIARGIN Normalize multidimensional input down to an array with two dimensions.
%   All input parameters up to the first string parameter are concatenated up to the last
%   plus one dimension of the highest order parameter. The dimensions of the less dimensional
%   parameters must be equal from the start of higher dimensional parameters.
%
% See also MULTIARGOUT

% The output can have a different layout as the input: e.g. LAB=XYZ2LAB(X,Y,Z), which will
% return LAB as a ND matrix with SIZE(LAB) == [SIZE(X) 3]. As a special case, if the all the
% dimensions between the first and last in LAB is one, the ND-array is reduced to a 2D array.

% Part of the OptProp toolbox, $Version: 2.1 $
% Author:  Jerker Wågberg, More Research & DPC, Sweden

    
function [err, argout, inshape, varargout] = MultiArgIn(dims, varargin)
%MULTIARGIN Normalize multidimensional input down to an array with two dimensions.
%   All input parameters up to the first string parameter are concatenated up to the last
%   plus one dimension of the highest order parameter. The dimensions of the less dimensional
%   parameters must be equal from the start of higher dimensional parameters.
%
% See also MULTIARGOUT

% The output can have a different layout as the input: e.g. LAB=XYZ2LAB(X,Y,Z), which will
% return LAB as a ND matrix with SIZE(LAB) == [SIZE(X) 3]. As a special case, if the all the
% dimensions between the first and last in LAB is one, the ND-array is reduced to a 2D array.

% Part of the OptProp toolbox, $Version: 2.1 $
% Author:  Jerker Wågberg, More Research & DPC, Sweden
% Email: ['jerker.wagberg' char(64) 'more.se']

% $Id: MultiArgIn.m 23 2007-01-28 22:55:34Z jerkerw $

	err=[];
	argout=[];
	inshape=[];
	if nargout >=4; varargout=repmat({{}},1,nargout-3); end