1 ## Copyright (C) 2008-2012 Jaroslav Hajek
3 ## This file is part of Octave.
5 ## Octave is free software; you can redistribute it and/or modify it
6 ## under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation; either version 3 of the License, or (at
8 ## your option) any later version.
10 ## Octave is distributed in the hope that it will be useful, but
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 ## General Public License for more details.
15 ## You should have received a copy of the GNU General Public License
16 ## along with Octave; see the file COPYING. If not, see
17 ## <http://www.gnu.org/licenses/>.
20 ## @deftypefn {Function File} {} __fdjac__ (@var{fcn}, @var{x}, @var{fvec}, @var{err})
21 ## Undocumented internal function.
24 function fjac = __fdjac__ (fcn, x, fvec, typicalx, cdif, err = 0)
26 err = (max (eps, err)) ^ (1/3);
28 fjac = zeros (length (fvec), numel (x));
33 fjac(:,i) = (fcn (x1)(:) - fcn (x2)(:)) / (x1(i) - x2(i));
36 err = sqrt (max (eps, err));
38 fjac = zeros (length (fvec), numel (x));
42 fjac(:,i) = (fcn (x1)(:) - fvec) / (x1(i) - x(i));