--- /dev/null
+## Copyright (C) 2005 Michel D. Schmid <michaelschmid@users.sourceforge.net>
+##
+##
+## This program is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2, or (at your option)
+## any later version.
+##
+## This program is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; see the file COPYING. If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {}@var{perf} = __mse (@var{E})
+## @code{__mse} returns the Mean-Square-Error of a vector E
+##
+## @example
+##
+## This function is used to calculate the network performance
+## @end example
+##
+## @end deftypefn
+
+## @seealso{__mae}
+
+## Author: Michel D. Schmid
+
+function perf = __mse(E)
+
+ ## check number of inputs
+ error(nargchk(1,1,nargin));
+
+ if iscell(E)
+ perf = 0;
+ elements = 0;
+ for i=1:size(E,1)
+ for j=1:size(E,2)
+ perf = perf + sum(sum(E{i,j}.^2));
+ elements = elements + prod(size(E{i,j}));
+ endfor
+ endfor
+ perf = perf / elements;
+ else
+ error("Error vector should be a cell array!")
+ endif
+
+
+endfunction
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