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: createTranslation.m
    path of file: ./repos/matGeom/matGeom/geom2d
    
    the code of the file until where you have to start completion: function trans = createTranslation(varargin)

    
function trans = createTranslation(varargin)
%CREATETRANSLATION Create the 3*3 matrix of a translation.
%
%   TRANS = createTranslation(DX, DY);
%   Returns the translation corresponding to DX and DY.
%   The returned matrix has the form :
%   [1 0 TX]
%   [0 1 TY]
%   [0 0  1]
%
%   TRANS = createTranslation(VECTOR);
%   Returns the matrix corresponding to a translation by the vector [x y].
%
%
%   See also 
%   transforms2d, transformPoint, createRotation, createScaling

% ------
% Author: David Legland 
% E-mail: david.legland@inrae.fr
% Created: 2004-04-06
% Copyright 2004-2023 INRA - TPV URPOI - BIA IMASTE

% process input arguments
if isempty(varargin)
    tx = 0;
    ty = 0;
elseif length(varargin)==1
    var = varargin{1};
    tx = var(1);
    ty = var(2);
else
    tx = varargin{1};
    ty = varargin{2};
end