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########################################################################
##
## Copyright (C) 2016-2025 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## 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
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{fcn} =} check_default_input (@var{fcn}, @var{trange}, @var{solver}, @var{y0}, @var{yp0})
## Undocumented internal function.
## @end deftypefn
function fcn = check_default_input (fcn, trange, solver, y0, yp0)
if (nargin < 4)
print_usage ();
endif
## Check fcn
validateattributes (fcn, {"function_handle", "char"}, {}, solver, "fcn");
if (! (nargin (fcn) == nargin - 2))
error ("Octave:invalid-input-arg",
[solver ": invalid value assigned to field 'fcn'"]);
endif
if (ischar (fcn))
if (! exist (fcn))
error ("Octave:invalid-input-arg",
[solver ": function '" fcn "' not found"]);
endif
fcn = str2func (fcn);
endif
if (! is_function_handle (fcn))
error ("Octave:invalid-input-arg",
[solver ": invalid value assigned to field '" fcn "'"]);
endif
## Check trange
validateattributes (trange, {"float"}, {"vector", "real"}, solver, "trange");
if (numel (trange) < 2)
error ("Octave:invalid-input-arg",
[solver ": invalid value assigned to field 'trange'"]);
elseif (! ((all (diff (trange) > 0)) || all (diff (-trange) > 0)))
error ("Octave:invalid-input-arg",
[solver ": invalid value assigned to field 'trange'"]);
endif
## Check y0 and yp0
if (! isnumeric (y0) || ! isvector (y0))
error ("Octave:invalid-input-arg",
[solver ": Y0 must be a numeric vector"]);
endif
y0 = y0(:);
if (nargin == 5)
if (! isnumeric (yp0) || ! isvector (yp0))
error ("Octave:invalid-input-arg",
[solver ": YP0 must be a numeric vector"]);
endif
yp0 = yp0(:);
n = numel (feval (fcn, trange(1), y0, yp0));
validateattributes (yp0, {"float"}, {"numel", n}, solver, "yp0");
else
n = numel (feval (fcn, trange(1), y0));
endif
validateattributes (y0, {"float"}, {"numel", n}, solver, "y0");
endfunction
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