1 ## Copyright (C) 2007-2012 David Bateman
3 ## This file is part of Octave.
5 ## Octave is free software; you can redistribute it and/or modify it
6 ## under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation; either version 3 of the License, or (at
8 ## your option) any later version.
10 ## Octave is distributed in the hope that it will be useful, but
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 ## General Public License for more details.
15 ## You should have received a copy of the GNU General Public License
16 ## along with Octave; see the file COPYING. If not, see
17 ## <http://www.gnu.org/licenses/>.
19 ## Undocumented internal function.
22 ## @deftypefn {Function File} {@var{yi} =} __splinen__ (@var{x}, @var{y}, @var{xi})
23 ## Undocumented internal function.
26 ## FIXME: Allow arbitrary grids..
28 function yi = __splinen__ (x, y, xi, extrapval, f)
30 error ("__splinen__: Incorrect number of arguments");
32 ## ND isvector function.
33 isvec = @(x) numel (x) == length (x);
34 if (!iscell (x) || length(x) < ndims(y) || any (! cellfun (isvec, x))
35 || !iscell (xi) || length(xi) < ndims(y) || any (! cellfun (isvec, xi)))
36 error ("__splinen__: %s: non gridded data or dimensions inconsistent", f);
39 for i = length(x):-1:1
40 yi = permute (spline (x{i}, yi, xi{i}(:)), [length(x),1:length(x)-1]);
43 [xi{:}] = ndgrid (cellfun (@(x) x(:), xi, "uniformoutput", false){:});
44 idx = zeros (size(xi{1}));
46 idx |= xi{i} < min (x{i}(:)) | xi{i} > max (x{i}(:));