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: polygonLength.m
    path of file: ./repos/matGeom/matGeom/polygons2d
    
    the code of the file until where you have to start completion: function len = polygonLength(poly, varargin)
%POLYGONLENGTH Perimeter of a polygon.
%
%   L = polygonLength(POLYGON);
%   Computes the boundary length of a polygon. POLYGON is given by a N-by-2
%   array of vertices. 
%
%   Example
%     % Perimeter of a circle approximation
%     poly = circleToPolygon([0 0 1], 200);
%     polygonLength(poly)
%     ans =
%         6.2829
%
%   See also 
%   polygons2d, polygonCentroid, polygonArea, drawPolygon, polylineLength
%


    
function len = polygonLength(poly, varargin)
%POLYGONLENGTH Perimeter of a polygon.
%
%   L = polygonLength(POLYGON);
%   Computes the boundary length of a polygon. POLYGON is given by a N-by-2
%   array of vertices. 
%
%   Example
%     % Perimeter of a circle approximation
%     poly = circleToPolygon([0 0 1], 200);
%     polygonLength(poly)
%     ans =
%         6.2829
%
%   See also 
%   polygons2d, polygonCentroid, polygonArea, drawPolygon, polylineLength
%

% ------
% Author: David Legland 
% E-mail: david.legland@inrae.fr
% Created: 2005-05-11
% Copyright 2005-2023 INRA - TPV URPOI - BIA IMASTE

% If first argument is a cell array, this is a multi-polygon, and we simply
% add the lengths of individual polygons
if iscell(poly)
    len = 0;
    for i = 1:length(poly)
        len = len + polygonLength(poly{i});
    end