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improve Matlab compatibility & performance of ppval/mkpp and some associated funcs
author Jaroslav Hajek <highegg@gmail.com>
date Mon, 02 Nov 2009 14:04:06 +0100
parents 16f53d29049f
children 693e22af08ae
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16f53d29049f update copyright notices
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2000, 2006, 2007, 2008, 2009 Paul Kienzle
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {[@var{x}, @var{p}, @var{n}, @var{k}, @var{d}] =} unmkpp (@var{pp})
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21 ##
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22 ## Extract the components of a piece-wise polynomial structure @var{pp}.
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23 ## These are as follows:
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24 ##
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25 ## @table @asis
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26 ## @item @var{x}
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27 ## Sample points.
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28 ## @item @var{p}
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29 ## Polynomial coefficients for points in sample interval. @code{@var{p}
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30 ## (@var{i}, :)} contains the coefficients for the polynomial over
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31 ## interval @var{i} ordered from highest to lowest. If @code{@var{d} >
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32 ## 1}, @code{@var{p} (@var{r}, @var{i}, :)} contains the coefficients for
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33 ## the r-th polynomial defined on interval @var{i}.
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34 ## @item @var{n}
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35 ## Number of polynomial pieces.
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36 ## @item @var{k}
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37 ## Order of the polynomial plus 1.
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38 ## @item @var{d}
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39 ## Number of polynomials defined for each interval.
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40 ## @end table
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41 ##
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42 ## @seealso{mkpp, ppval, spline}
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43 ## @end deftypefn
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44
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45 function [x, P, n, k, d] = unmkpp (pp)
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46 if (nargin == 0)
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47 print_usage ();
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48 endif
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49 if (! isstruct (pp))
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50 error ("unmkpp: expecting piecewise polynomial structure");
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51 endif
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52 x = pp.x;
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53 P = pp.P;
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Jaroslav Hajek <highegg@gmail.com>
parents: 9245
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54 n = size (P, 2);
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55 k = size (P, 3);
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56 d = pp.d;
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57 if (d == 1)
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58 P = reshape (P, n, k);
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59 endif
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60 endfunction