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# offset

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

### Function Synopsis

    [outmat,col_offset] = offset(inmat,col_offset);

### Help Text

    OFFSET - each column in inmat such that a plot(outmat) looks good.
     function [outmat,col_offset] = offset(inmat,col_offset);
     If col_offset is given, use it; otherwise, caculate a "good" col_offset.
     plot([outmat col_offset]) gives baselines as well

### Cross-Reference Information

This function is called by

    bst_headmodeler                    C:\BrainStorm_2001\Toolbox\bst_headmodeler.m
    ds2brainstorm                      C:\BrainStorm_2001\Toolbox\ds2brainstorm.m
    get_gain                           C:\BrainStorm_2001\Toolbox\get_gain.m
    meg4read                           C:\BrainStorm_2001\Toolbox\meg4read.m
    mri_read_tool                      C:\BrainStorm_2001\Toolbox\mri_read_tool.m
    mritool_cb                         C:\BrainStorm_2001\Toolbox\mritool_cb.m
    parametric_estimation              C:\BrainStorm_2001\Toolbox\parametric_estimation.m
    results_visualization              C:\BrainStorm_2001\Toolbox\results_visualization.m
    sourceimaging                      C:\BrainStorm_2001\Toolbox\sourceimaging.m

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

    function [outmat,col_offset] = offset(inmat,col_offset);
    %OFFSET - each column in inmat such that a plot(outmat) looks good.
    % function [outmat,col_offset] = offset(inmat,col_offset);
    % If col_offset is given, use it; otherwise, caculate a "good" col_offset.
    % plot([outmat col_offset]) gives baselines as well

    %<autobegin> ---------------------- 26-May-2004 11:31:14 -----------------------
    % --------- Automatically Generated Comments Block Using AUTO_COMMENTS ---------
    %
    % CATEGORY: Utility - General
    %
    % At Check-in: $Author: Mosher $  $Revision: 12 $  $Date: 5/26/04 10:00a $
    %
    % 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 11:31:14 -----------------------

    % Copyright (c) 1993-98 John C. Mosher, Ph.D.
    %  See Copyright.m file for information
    % 12/1/93 Author
    % $Revision: 12 $ $Date: 5/26/04 10:00a $

    [m,n] = size(inmat);

    if(exist('col_offset')~=1),        % user didn't give an col_offset
      sd = sort(abs(inmat(:)));        % sort all data
      if isempty(find(inmat(:)<0))
          col_offset = 1.2*sd(floor(m*n*.99));    % When data are all positive
      else
          col_offset = 2*sd(floor(m*n*.99));% otherwise
      end
    end
    col_offset = [0:(n-1)]*col_offset;
    col_offset = col_offset(ones(m,1),:); % matrix

    outmat = inmat + col_offset;    % each column now col_offset

    return

Produced by color_mat2html, a customized BrainStorm 2.0 (Alpha) version of mat2html on Tue Nov 2 16:17:59 2004
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