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# read_gain

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

### Function Synopsis

    G = read_gain(FILENAME,chanID,srcID);

### Help Text

    READ_GAIN - Extract parts or a compete gain matrix from .bin binay gain file
    function G = read_gain(FILENAME,chanID,srcID);
     Extract parts or a compete gain matrix from .bin binay gain file
     The gain matrix file must be in the BrainStorm binary file format.

     INPUTS
            FILENAME: a character string describing the name of the file containing the matrix
            chanID  : Optional vector of indices linked to the ROWS of the matrix (ie channels) to be extracted
                      If chanID is LEFT EMPTY, the matrix is extracted for all channels
            srcID   : Optional vector of indices linked to the COLUMNS of the matrix to be extracted
                      If srcID is LEFT EMPTY, matrix is extracted for all sources
     OUTPUT
            G       : an array containing the forward fields of the gain (sub)matrix.

     See also GET_GAIN, LOAD_RAW, SAVE_RAW

### Cross-Reference Information

This function calls

    get_gain                           C:\BrainStorm_2001\Toolbox\get_gain.m
    get_user_directory                 C:\BrainStorm_2001\Toolbox\get_user_directory.m

This function is called by

    bst_sourceimaging                  C:\BrainStorm_2001\Toolbox\bst_sourceimaging.m
    lcmvbf                             C:\BrainStorm_2001\Toolbox\lcmvbf.m
    minnorm                            C:\BrainStorm_2001\Toolbox\minnorm.m
    sourceimaging                      C:\BrainStorm_2001\Toolbox\sourceimaging.m

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

    function G = read_gain(FILENAME,chanID,srcID);
    %READ_GAIN - Extract parts or a compete gain matrix from .bin binay gain file
    %function G = read_gain(FILENAME,chanID,srcID);
    % Extract parts or a compete gain matrix from .bin binay gain file
    % The gain matrix file must be in the BrainStorm binary file format.
    %
    % INPUTS
    %        FILENAME: a character string describing the name of the file containing the matrix
    %        chanID  : Optional vector of indices linked to the ROWS of the matrix (ie channels) to be extracted
    %                  If chanID is LEFT EMPTY, the matrix is extracted for all channels
    %        srcID   : Optional vector of indices linked to the COLUMNS of the matrix to be extracted
    %                  If srcID is LEFT EMPTY, matrix is extracted for all sources
    % OUTPUT
    %        G       : an array containing the forward fields of the gain (sub)matrix.
    %
    % See also GET_GAIN, LOAD_RAW, SAVE_RAW

    %<autobegin> ---------------------- 08-Jun-2004 15:12:54 -----------------------
    % --------- Automatically Generated Comments Block Using AUTO_COMMENTS ---------
    %
    % CATEGORY: Forward Modeling
    %
    % Alphabetical list of external functions (non-Matlab):
    %   toolbox\get_gain.m
    %   toolbox\get_user_directory.m
    %
    % At Check-in: $Author: Mosher $  $Revision: 18 $  $Date: 6/08/04 1:39p $
    %
    % This software is part of BrainStorm Toolbox Version 2.0 (Alpha) 28-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> ------------------------ 08-Jun-2004 15:12:54 -----------------------

    % \------------------------------------------------------/
    % | *** Sylvain Baillet, Ph.D.                           |
    % | Cognitive Neuroscience & Brain Imaging Laboratory    |
    % | CNRS UPR640 - LENA                                   |
    % | Hopital de la Salpetriere, Paris, France             |
    % | sylvain.baillet@chups.jussieu.fr                     |
    % \------------------------------------------------------/
    %
    % Date of creation: October 2002
    % Script History -----------------------------------------------------------------------------------
    % JCM 27-May-2004  Comments updating
    %---------------------------------------------------------------------------------------------------

    % Open the file
    fid = fopen(FILENAME ,'r','ieee-be');
    if fid < 0
        Users = get_user_directory;
        cd(Users.STUDIES)
        fid = fopen(FILENAME ,'r','ieee-be');
    end

    if fid < 0
       errordlg([FILENAME,' is not in current directory or in the Matlab search path.'],'HeadModel file was not found.');
       return
    end

    if nargin == 1
       G = get_gain(fid);
    elseif nargin == 2
       G = get_gain(fid,srcID);
    elseif nargin == 3
       if isempty(srcID) % ChanID is defined but srcID is left blank
          G = get_gain(fid);
       else
          G = get_gain(fid,srcID);
       end
       if ~isempty(chanID)
           G = G(chanID,:); % Keep only channels of interest
       end
    end

    fclose(fid);

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