Mercurial > octave-nkf
view scripts/general/__splinen__.m @ 6967:65a28e9de0a5
[project @ 2007-10-06 12:47:11 by jwe]
author | jwe |
---|---|
date | Sat, 06 Oct 2007 12:49:25 +0000 |
parents | 6bbf56a9718a |
children | 93c65f2a5668 |
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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. ## Undocumented internal function. ## -*- texinfo -*- ## @deftypefn {Function File} {@var{yi} = } __splinen__ (@var{x}, @var{y}, @var{xi}) ## Internal support function for multi-dimensional splines. ## @end deftypefn ## FIXME: Allow arbitrary grids.. function yi = __splinen__ (x, y, xi, extrapval, f) if (nargin != 5) error ("Incorrect number of arguments"); endif isvec = @(x) numel (x) == length (x); # ND isvector function if (!iscell (x) || length(x) < ndims(y) || any (! cellfun (isvec, x)) || !iscell (xi) || length(xi) < ndims(y) || any (! cellfun (isvec, xi))) error ("%s: non gridded data or dimensions inconsistent", f); endif yi = y; for i = length(x):-1:1 yi = permute (spline (x{i}, yi, xi{i}), [length(x),1:length(x)-1]); endfor [xi{:}] = ndgrid (xi{:}); idx = zeros (size(xi{1})); for i = 1 : length(x) idx |= xi{i} < min (x{i}(:)) | xi{i} > max (x{i}(:)); endfor yi(idx) = extrapval; endfunction