1######################################################################## 2## 3## Copyright (C) 2013-2021 The Octave Project Developers 4## 5## See the file COPYRIGHT.md in the top-level directory of this 6## distribution or <https://octave.org/copyright/>. 7## 8## This file is part of Octave. 9## 10## Octave is free software: you can redistribute it and/or modify it 11## under the terms of the GNU General Public License as published by 12## the Free Software Foundation, either version 3 of the License, or 13## (at your option) any later version. 14## 15## Octave is distributed in the hope that it will be useful, but 16## WITHOUT ANY WARRANTY; without even the implied warranty of 17## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18## GNU General Public License for more details. 19## 20## You should have received a copy of the GNU General Public License 21## along with Octave; see the file COPYING. If not, see 22## <https://www.gnu.org/licenses/>. 23## 24######################################################################## 25 26## -*- texinfo -*- 27## @deftypefn {} {retval =} AbsRel_norm (@var{x}, @var{x_old}, @var{AbsTol}, @var{RelTol}, @var{normcontrol}, @var{y}) 28## Undocumented internal function. 29## @end deftypefn 30 31function retval = AbsRel_norm (x, x_old, AbsTol, RelTol, normcontrol, y = zeros (size (x))) 32 33 if (normcontrol) 34 sc = max (AbsTol(:), RelTol * max (sqrt (sumsq (x)), sqrt (sumsq (x_old)))); 35 retval = sqrt (sumsq ((x - y))) / sc; 36 else 37 sc = max (AbsTol(:), RelTol .* max (abs (x), abs (x_old))); 38 retval = max (abs (x - y) ./ sc); 39 endif 40 41endfunction 42