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: uncvar.m
    path of file: ./repos/YALMIP/extras
    
    the code of the file until where you have to start completion: function sys = uncvar(varargin)
%UNCVAR Create symbolic uncertain variable 
%   
%   UNCVAR works exactly as SDPVAR, [FIX...]
%
%   See also SDPVAR

all_variable_names = 1;

    
function sys = uncvar(varargin)
%UNCVAR Create symbolic uncertain variable 
%   
%   UNCVAR works exactly as SDPVAR, [FIX...]
%
%   See also SDPVAR

all_variable_names = 1;
i = 1;
while all_variable_names & i<=nargin
    all_variable_names = all_variable_names & isvarname(varargin{i});
    i = i + 1;
end