VARARGIN VARARGIN Variable Input Arguments

Usage

FreeMat functions can take a variable number of input arguments
by setting the last argument in the argument list to varargin.
This special keyword indicates that all arguments to the
function (beyond the last non-varargin keyword) are assigned
to a cell array named varargin available to the function.
Variable argument functions are usually used when writing 
driver functions, i.e., functions that need to pass arguments
to another function.  The general syntax for a function that
takes a variable number of arguments is

  function [out_1,...,out_M] = fname(in_1,..,in_M,varargin)

Inside the function body, varargin collects the arguments 
to fname that are not assigned to the in_k.