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+## Copyright (C) 2007  David Bateman
+##
+## 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 2, 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, write to the Free
+## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+## 02110-1301, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Loadable Function} {@var{idx} =} dsearch (@var{x}, @var{y}, @var{tri}, @var{xi}, @var{yi})
+## @deftypefnx {Loadable Function} {@var{idx} =} dsearch (@var{x}, @var{y}, @var{tri}, @var{xi}, @var{yi}, @var{s})
+## Returns the index @var{idx} or the closest point in @code{@var{x}, @var{y})}
+## to the elements @code{[@var{xi}(:), @var{yi}(:)]}. The variable @var{s} is
+## accepted but ignored for compatibility.
+## @seealso{dsearchn, tsearch}
+## @end deftypefn
+
+function idx = dsearch (x, y, t, xi, yi, s)
+  if (nargin < 5 || nargin > 6)
+    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);