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: binomialprob.m
    path of file: ./repos/fieldtrip/private
    
    the code of the file until where you have to start completion: function [bp, x] = binomialprob(pobs, alpha, subjratio)

% BINOMIALPROB computes the probability of observing a significant effect
% in multiple tests. It allows you to test questions like "How likely
% is it that there is a significant effect at this time-frequency point
% for 8 out of 10 subjects, given that the probability of observing a
% significant effect in a given subject is 5%"

    
function [bp, x] = binomialprob(pobs, alpha, subjratio)

% BINOMIALPROB computes the probability of observing a significant effect
% in multiple tests. It allows you to test questions like "How likely
% is it that there is a significant effect at this time-frequency point
% for 8 out of 10 subjects, given that the probability of observing a
% significant effect in a given subject is 5%"
% 
% Use as
%    [bprob] = binomialprob(prob, alpha)
% where
%   prob   is a Nvoxel X Nsubject matrix with the single-subject probability
%   alpha  is the probability of observing a significant voxel
%
% The function also has more advanced functionality, please read the code 
% if you are interested.
%
% See also BINOPDF, BINOCDF

% Copyright (C) 2005, Robert Oostenveld
%
% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org
% for the documentation and details.
%
%    FieldTrip is free software: you can redistribute it and/or modify
%    it under the terms of the GNU General Public License as published by
%    the Free Software Foundation, either version 3 of the License, or
%    (at your option) any later version.
%
%    FieldTrip is distributed in the hope that it will be useful,
%    but WITHOUT ANY WARRANTY; without even the implied warranty of
%    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%    GNU General Public License for more details.
%
%    You should have received a copy of the GNU General Public License
%    along with FieldTrip. If not, see <http://www.gnu.org/licenses/>.
%
% $Id$

% determine the number of subjects
[M, N] = size(pobs);

if nargin<2
  alpha = [];
end