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########################################################################
##
## Copyright (C) 2007-2025 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{idx} =} dsearch (@var{x}, @var{y}, @var{tri}, @var{xi}, @var{yi})
## @deftypefnx {} {@var{idx} =} dsearch (@var{x}, @var{y}, @var{tri}, @var{xi}, @var{yi}, @var{s})
##
## @code{dsearch} is deprecated and will be removed in Octave version 12. Use
## @code{dsearchn} instead.
##
## @code{dsearch (@dots{}) @equiv{} dsearchn ([@var{x}, @var{y}], @var{tri},
## [@var{xi}, @var{yi}])}
##
## Return the index @var{idx} of the closest point in @code{@var{x}, @var{y}}
## to the elements @code{[@var{xi}(:), @var{yi}(:)]}.
##
## The variables @var{s} and @var{tri} are accepted for compatibility, but they
## are not used in the calculation or checked for validity.
##
## @seealso{dsearchn, tsearchn}
## @end deftypefn
## FIXME: DEPRECATED: Remove in version 12.
function idx = dsearch (x, y, tri, xi, yi, s)
persistent warned = false;
if (! warned)
warned = true;
warning ("Octave:deprecated-function",
"dsearch is deprecated and will be removed from a future version of Octave, please use dsearchn instead\n");
endif
if (nargin < 5)
print_usage ();
endif
idx = __dsearchn__ ([x(:), y(:)], [xi(:), yi(:)]);
endfunction
%!shared x, y, tri
%! x = [-1;-1;1];
%! y = [-1;1;-1];
%! tri = [1,2,3];
%!assert (dsearch (x,y,tri,1,1/3), 3)
%!assert (dsearch (x,y,tri,1/3,1), 2)
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