maint: Remove obsolete ODE options from odeset/odeget/ode45. * odepkg_structure_check.m: Deleted file, replaced in code with ode_struct_value_check() * scripts/ode/module.mk: Remove odepkg_structure_check.m from build system. * ode45.m: Just print_usage(), rather than displaying help, if incorrect number of arguments supplied. Replace calls to odepkg_structure_check() with calls to ode_struct_value_check(). Use error ID "Octave:invalid-input-arg" rather than "OdePkg:InvalidArgument". Use local variables TimeStepNumber and TimeStepSize since these are no longer a default part of an ODE options structure. Remove options that are no longer a part of ODE options structure. * odeget.m: Remove unused options. Allow unknown options through, but display a warning. * odeset.m: Remove unused options. Allow unknown options through, but dispaly a warning. Use special for loop over structure to simplify code. Add BIST tests for custom user-defined options and for input validation. * ode_struct_value_check.m: Rewrite docstring. Return input ode_struct as output so that function can replace odepk_structure_check. Use meaningful input variable name ode_struct rather than arg. Use special for loop syntax over structure to simplify code. Remove checking for obsolete, non-Matlab options. Use error ID "Octave:invalid-input-arg" rather than "OdePkg:InvalidArgument". Preface all error and warning messages with the name of the calling function. * AbsRel_Norm.m, integrate_const.m, integrate_n_steps.m: Use error ID "Octave:invalid-input-arg" rather than "OdePkg:InvalidArgument". * odepkg_event_handle.m: Rephrase sentence in docstring.

## Copyright (C) 2014-15 Jacopo Corno <jacopo.corno@gmail.com>
## Copyright (C) 2013 Roberto Porcu' <roberto.porcu@polimi.it>
##
## This file is part of Octave.
##
## Octave 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 3 of the License, or (at
## your option) any later version.
##
## Octave 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 Octave; see the file COPYING.  If not, see
## <http://www.gnu.org/licenses/>.

function retval = AbsRel_Norm (x, x_old, AbsTol, RelTol, normcontrol, y)

  n = length (x);

  if (nargin == 5)
    y = zeros (size (x));
  endif

  if (length (x_old) != n || length (y) != n)
    error ("Octave:invalid-input-arg", "invalid dimensions of input arguments");
  endif
  
  if ((length (AbsTol) != 1 && length (AbsTol) != n)
      || (length (RelTol) != 1 && length (RelTol) != n))
    error ("Octave:invalid-input-arg", "invalid dimensions of input arguments");
  endif
  
  sc = AbsTol + max (abs (x), abs (x_old)) .* RelTol;
  if (normcontrol)
    retval = max (abs (x - y) ./ sc);
  else
    retval = sqrt ((1 / n) * sumsq ((x - y) ./ sc));
  endif

endfunction