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diff --git a/octave_packages/nnet-0.1.13/min_max.m b/octave_packages/nnet-0.1.13/min_max.m
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+## 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{Pr} = min_max (@var{Pp})
+## @code{min_max} returns variable Pr with range of matrix rows
+##
+## @example
+## PR - R x 2 matrix of min and max values for R input elements
+## @end example
+##
+## @example
+## Pp = [1 2 3; -1 -0.5 -3]
+## pr = min_max(Pp);
+## pr = [1 3; -0.5 -3];
+## @end example
+## @end deftypefn
+
+## Author: Michel D. Schmid
+
+function Pr = min_max(Pp)
+
+  ## check number of input args
+  error(nargchk(1,1,nargin))
+
+  Pr = []; # returns an empty matrix
+  #if ismatrix(Pp)
+  if (!(size(Pp,1)==1) && !(size(Pp,2)==1)) # ismatrix(1) will return 1!!!
+    if isreal(Pp) # be sure, this is no complex matrix
+      Pr = [min(Pp,[],2) max(Pp,[],2)];
+    else
+      error("Argument has illegal type.")
+    endif
+  else
+    error("Argument must be a matrix.")
+  endif
+
+endfunction
+
+%!shared
+%! disp("testing min_max")
+%!test fail("min_max(1)","Argument must be a matrix.")
+%!test fail("min_max('testString')","Argument must be a matrix.")
+%!test fail("min_max(cellA{1}=1)","Argument must be a matrix.")
+%!test fail("min_max([1+1i, 2+2i])","Argument must be a matrix.")
+%!test fail("min_max([1+1i, 2+2i; 3+1i, 4+2i])","Argument has illegal type.")
+
+