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: indchantype.m
    path of file: ./repos/spm/@meeg
    
    the code of the file until where you have to start completion: function ind = indchantype(this, types, flag)
% Method for getting channel indices based on labels and/or types
% FORMAT  ind = indchantype(this, types)
% this       - MEEG object
% channels   - string or cell array of strings may include
%             ('ALL', 'EEG', 'MEG', 'ECG', 'EOG' etc.)
% flag       - 'GOOD' or 'BAD' to include only good or bad channels
%              respectively (all are selected by default)
%              

    
function ind = indchantype(this, types, flag)
% Method for getting channel indices based on labels and/or types
% FORMAT  ind = indchantype(this, types)
% this       - MEEG object
% channels   - string or cell array of strings may include
%             ('ALL', 'EEG', 'MEG', 'ECG', 'EOG' etc.)
% flag       - 'GOOD' or 'BAD' to include only good or bad channels
%              respectively (all are selected by default)
%              
% ind        - vector of channel indices matching labels
%__________________________________________________________________________

% Vladimir Litvak
% Copyright (C) 2008-2022 Wellcome Centre for Human Neuroimaging


if ischar(types)    
    types = {types};
end