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annotate scripts/general/private/__splinen__.m @ 29359:7854d5752dd2

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maint: merge stable to default.
author John W. Eaton <jwe@octave.org>
date Wed, 10 Feb 2021 10:10:40 -0500
parents 512591ccb174 0a5b15007766
children 796f54d4ddbf
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 2007-2021 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {@var{yi} =} __splinen__ (@var{x}, @var{y}, @var{xi}, @var{extrapval}, @var{f})
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28 ## Undocumented internal function.
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29 ## @end deftypefn
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30
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31 ## FIXME: Allow arbitrary grids.
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32
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33 function yi = __splinen__ (x, y, xi, extrapval, f)
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34
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35 ## ND function to check whether any object in cell array is *not* a vector.
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36 isnotvec = @(x) cellfun ("numel", x) != cellfun ("length", x);
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37 if (! iscell (x) || length (x) < ndims (y) || any (isnotvec (x))
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38 || ! iscell (xi) || length (xi) < ndims (y) || any (isnotvec (xi)))
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39 error ("__splinen__: %s: non-gridded data or dimensions inconsistent", f);
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40 endif
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41
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42 yi = y;
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43 for i = length (x):-1:1
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44 yi = permute (spline (x{i}, yi, xi{i}(:)), [length(x),1:length(x)-1]);
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45 endfor
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46
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47 if (! isempty (extrapval))
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48 [xi{:}] = ndgrid (cellfun (@(x) x(:), xi, "uniformoutput", false){:});
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49 idx = false (size (xi{1}));
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50 for i = 1 : length (x)
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51 idx |= xi{i} < min (x{i}(:)) | xi{i} > max (x{i}(:));
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52 endfor
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53 yi(idx) = extrapval;
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54 endif
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55
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56 endfunction