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: s2m.m
    path of file: ./repos/iso2mesh
    
    the code of the file until where you have to start completion: function [node,elem,face]=s2m(v,f,keepratio,maxvol,method,regions,holes,varargin)
%
% [node,elem,face]=s2m(v,f,keepratio,maxvol,method)
% [node,elem,face]=s2m(v,f,keepratio,maxvol,'tetgen',regions,holes)
%
% volumetric mesh generation from a closed surface, shortcut for surf2mesh
%
% author: Qianqian Fang (q.fang at neu.edu)
%
% inputs and outputs are similar to those defined in surf2mesh
%
% if method='cgalpoly', s2m will call cgals2m and keepratio should be a 
% structure (as the 'opt' input in cgals2m)
%
% input default values:

    
function [node,elem,face]=s2m(v,f,keepratio,maxvol,method,regions,holes,varargin)
%
% [node,elem,face]=s2m(v,f,keepratio,maxvol,method)
% [node,elem,face]=s2m(v,f,keepratio,maxvol,'tetgen',regions,holes)
%
% volumetric mesh generation from a closed surface, shortcut for surf2mesh
%
% author: Qianqian Fang (q.fang at neu.edu)
%
% inputs and outputs are similar to those defined in surf2mesh
%
% if method='cgalpoly', s2m will call cgals2m and keepratio should be a 
% structure (as the 'opt' input in cgals2m)
%
% input default values:
%       method: if ignored, iso2mesh uses surf2mesh ('tetgen') to do the
%               tetrahedral mesh generation
%       regions,holes: if ignored, iso2mesh assumes both are empty
%
% -- this function is part of iso2mesh toolbox (http://iso2mesh.sf.net)
%

if(nargin>=5 && strcmp(method,'cgalpoly'))
    [node,elem,face]=cgals2m(v,f,keepratio,maxvol);
    return;
end