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# dist_sph

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

### Function Synopsis

    d = dist_sph(vec,sensloc)

### Help Text

    DIST_SPH - FMINS distance function used to minimize the fit to a sphere
     function d = dist_sph(vec,sensloc)
     Given center and list of sensor points
      find the average distance from the center to these points

### Cross-Reference Information

This function calls

    norlig                             C:\BrainStorm_2001\Toolbox\norlig.m
    vec                                C:\BrainStorm_2001\Toolbox\vec.m

This function is called by

    bestfitsph                         C:\BrainStorm_2001\Toolbox\bestfitsph.m
    bst_headmodeler                    C:\BrainStorm_2001\Toolbox\bst_headmodeler.m
    carto_sph                          C:\BrainStorm_2001\Toolbox\carto_sph.m
    headmodeler_gui                    C:\BrainStorm_2001\Toolbox\headmodeler_gui.m

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

    function d = dist_sph(vec,sensloc)
    %DIST_SPH - FMINS distance function used to minimize the fit to a sphere
    % function d = dist_sph(vec,sensloc)
    % Given center and list of sensor points
    %  find the average distance from the center to these points

    %<autobegin> ---------------------- 26-May-2004 11:30:10 -----------------------
    % --------- Automatically Generated Comments Block Using AUTO_COMMENTS ---------
    %
    % CATEGORY: Utility - Numeric
    %
    % Alphabetical list of external functions (non-Matlab):
    %   toolbox\norlig.m
    %
    % At Check-in: $Author: Mosher $  $Revision: 14 $  $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 11:30:10 -----------------------

    % History -----------------------------------------
    % JCM mid-1990s  creation
    % SB late 90s  update
    % JCM 08-Sep-2003  comments
    % -------------------------------------------------

    R = vec(end);
    center = vec(1:end-1);
    nmes = size(sensloc,1);
    d = mean(abs(norlig(sensloc - ones(nmes,1)*center) - R)); % Average distance between the center if mass and the electrodes

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