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# get_channel

## (Toolbox/get_channel.m in BrainStorm 2.0 (Alpha))

### Function Synopsis

    [Channel,varargout] = get_channel(dataFileName);

### Help Text

    GET_CHANNEL - Get the Channel information associated with a particular data file
     function [Channel,varargout] = get_channel(dataFileName);
     function Channel = get_channel(dataFileName);
     function [Channel,ChannelFile] = get_channel(dataFileName);
     ChannelFile is the name of the channel...file
     If dataFileName is not given, retrieve it from the static taskbar

### Cross-Reference Information

This function calls

    bst_message_window                 C:\BrainStorm_2001\Toolbox\bst_message_window.m
    bst_static_taskbar                 C:\BrainStorm_2001\Toolbox\bst_static_taskbar.m
    get_user_directory                 C:\BrainStorm_2001\Toolbox\get_user_directory.m
    makeuswait                         C:\BrainStorm_2001\Toolbox\makeuswait.m

This function is called by

    bst_headmodeler                    C:\BrainStorm_2001\Toolbox\bst_headmodeler.m
    bst_sourceimaging                  C:\BrainStorm_2001\Toolbox\bst_sourceimaging.m
    data_manager                       C:\BrainStorm_2001\Toolbox\data_manager.m
    dataplot_cb                        C:\BrainStorm_2001\Toolbox\dataplot_cb.m
    extract_channels                   C:\BrainStorm_2001\Toolbox\extract_channels.m
    headmodeler_gui                    C:\BrainStorm_2001\Toolbox\headmodeler_gui.m

### Listing of function C:\BrainStorm_2001\Toolbox\get_channel.m

    function [Channel,varargout] = get_channel(dataFileName);
    %GET_CHANNEL - Get the Channel information associated with a particular data file
    % function [Channel,varargout] = get_channel(dataFileName);
    % function Channel = get_channel(dataFileName);
    % function [Channel,ChannelFile] = get_channel(dataFileName);
    % ChannelFile is the name of the channel...file
    % If dataFileName is not given, retrieve it from the static taskbar

    %<autobegin> ---------------------- 26-May-2004 11:30:19 -----------------------
    % --------- Automatically Generated Comments Block Using AUTO_COMMENTS ---------
    %
    % CATEGORY: Utility - General
    %
    % Alphabetical list of external functions (non-Matlab):
    %   toolbox\bst_message_window.m
    %   toolbox\bst_static_taskbar.m
    %   toolbox\makeuswait.m
    %
    % At Check-in: $Author: Mosher $  $Revision: 12 $  $Date: 5/26/04 9:59a $
    %
    % This software is part of BrainStorm Toolbox Version 2.0 (Alpha) 24-May-2004
    %
    % Principal Investigators and Developers:
    % ** Richard M. Leahy, PhD, Signal & Image Processing Institute,
    %    University of Southern California, Los Angeles, CA
    % ** John C. Mosher, PhD, Biophysics Group,
    %    Los Alamos National Laboratory, Los Alamos, NM
    % ** Sylvain Baillet, PhD, Cognitive Neuroscience & Brain Imaging Laboratory,
    %    CNRS, Hopital de la Salpetriere, Paris, France
    %
    % See BrainStorm website at http://neuroimage.usc.edu for further information.
    %
    % Copyright (c) 2004 BrainStorm by the University of Southern California
    % This software distributed  under the terms of the GNU General Public License
    % as published by the Free Software Foundation. Further details on the GPL
    % license can be found at http://www.gnu.org/copyleft/gpl.html .
    %
    % FOR RESEARCH PURPOSES ONLY. THE SOFTWARE IS PROVIDED "AS IS," AND THE
    % UNIVERSITY OF SOUTHERN CALIFORNIA AND ITS COLLABORATORS DO NOT MAKE ANY
    % WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
    % MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, NOR DO THEY ASSUME ANY
    % LIABILITY OR RESPONSIBILITY FOR THE USE OF THIS SOFTWARE.
    %<autoend> ------------------------ 26-May-2004 11:30:19 -----------------------

    if ~exist('dataFileName','var') | isempty(dataFileName),
        dataFileName = bst_static_taskbar('GET','DATA');
        dataFileName = dataFileName{1}; % only the first one used for reference
    end

    if iscell(dataFileName),
        dataFileName = dataFileName{1}; % only first cell element
    end

    if 0, % 29-Mar-2004, deprecated code - SB. Need to have this function stand alone and callable outside of BrainStorm
        % the database directories
        User = get_user_directory;

        if ~strncmp(lower(User.STUDIES),lower(dataFileName),length(User.STUDIES)),
            % referential name, make full
            dataFileName = fullfile(User.STUDIES,dataFileName);
        end
    end

    % the directory to the data file
    dirPath = fileparts(dataFileName);

    Pwd = pwd; % where are we now

    if ~isempty(dirPath)
        cd(dirPath)
    end

    channelFileNames = dir('*channel*.mat'); % all channel filenames

    channelFileNames = {channelFileNames.name}; % just the name

    if length(channelFileNames) > 1,
       bst_message_window({...
               ' ',...
               sprintf('NOTE: Multiple channel files in %s',dirPath),...
               ' '});
       errordlg({...
               ' ',...
               sprintf('Multiple channel files in %s',dirPath),...
               'Please alter this folder''s content so that it contains a single channel file.',...
               ' '},'Database needs cleaning !'...
           )
       makeuswait('stop')
       return

    end

    channelFileNames = channelFileNames{1}; % only the first

    if nargout > 1
        varargout{1} = channelFileNames;
    end

    load(channelFileNames); % loads "Channel" into the local area and returns it

    cd(Pwd); % back to where we were

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