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# fronorm

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

### Function Synopsis

    Fn = fronorm(A);

### Help Text

    FRONORM - Fast calculation of the Frobenius Norm of a Matrix
     function Fn = fronorm(A);
     At 1/3 the time and 1/2 the flops over norm(A,'fro'), calculate the
      Frobenius norm of A, Fn = sqrt(sum(A(:).^2));

### Cross-Reference Information

This function is called by

    least_squares_fit                  C:\BrainStorm_2001\Toolbox\least_squares_fit.m
    results_time_series                C:\BrainStorm_2001\Toolbox\results_time_series.m
    results_update                     C:\BrainStorm_2001\Toolbox\results_update.m

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

    function Fn = fronorm(A);
    %FRONORM - Fast calculation of the Frobenius Norm of a Matrix
    % function Fn = fronorm(A);
    % At 1/3 the time and 1/2 the flops over norm(A,'fro'), calculate the
    %  Frobenius norm of A, Fn = sqrt(sum(A(:).^2));

    %<autobegin> ---------------------- 26-May-2004 11:30:18 -----------------------
    % --------- Automatically Generated Comments Block Using AUTO_COMMENTS ---------
    %
    % CATEGORY: Utility - Numeric
    %
    % At Check-in: $Author: Mosher $  $Revision: 15 $  $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 11:30:18 -----------------------

    % ----------------------------- Script History ---------------------------------
    % 1994 John C. Mosher
    % March 11, 1994 Author
    % 08-Sep-2003 Commenting
    % 19-May-2004 JCM Comments Cleaning
    % ----------------------------- Script History ---------------------------------

    Fn = sqrt(A(:)'*A(:));

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