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: eeg_leadfieldb.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8/external/fieldtrip/forward/private
    
    the code of the file until where you have to start completion: function [lf] = eeg_leadfieldb(pos, elc, vol)

% EEG_LEADFIELDB computes the electric leadfield for a dipole in a volume
% using the boundary element method
%
% [lf] = eeg_leadfieldb(pos, elc, vol)
%
% with the input arguments
%   pos     position dipole (1x3 or Nx3)
%   elc     position electrodes (optional, can be empty)
%   vol     volume conductor model
%
% the volume conductor model is a structure and should have the fields

    
function [lf] = eeg_leadfieldb(pos, elc, vol)

% EEG_LEADFIELDB computes the electric leadfield for a dipole in a volume
% using the boundary element method
%
% [lf] = eeg_leadfieldb(pos, elc, vol)
%
% with the input arguments
%   pos     position dipole (1x3 or Nx3)
%   elc     position electrodes (optional, can be empty)
%   vol     volume conductor model
%
% the volume conductor model is a structure and should have the fields
%   vol.bnd structure array with vertices and triangles of each boundary
%   vol.cond    conductivity of all compartments
%   vol.mat     system matrix, which can include the electrode interpolation
%
% the compartment boundaries are described by a structure array with
%   vol.bnd(i).pnt
%   vol.bnd(i).pnt

% Copyright (C) 2003, Robert Oostenveld
%
% This file is part of FieldTrip, see http://www.ru.nl/neuroimaging/fieldtrip
% 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: eeg_leadfieldb.m 7123 2012-12-06 21:21:38Z roboos $


% do some sanity checks
if ~isfield(vol, 'bnd')
  error('there are no compartment boundaries present');
end