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1 ## Copyright (C) 2000 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 2, or (at your option) |
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8 ## 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, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {[@var{x}, @var{p}, @var{n}, @var{k}, @var{d}] =} unmkpp (@var{pp}) |
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22 ## |
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23 ## Extract the components of a piece-wise polynomial structure @var{pp}. |
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24 ## These are as follows: |
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25 ## |
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26 ## @table @asis |
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27 ## @item @var{x} |
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28 ## Samples points. |
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29 ## @item @var{p} |
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30 ## Polynomial coefficients for points in sample interval. @code{@var{p} |
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31 ## (@var{i}, :)} contains the coefficients for the polynomial over |
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32 ## interval @var{i} ordered from highest to lowest. If @code{@var{d} > |
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33 ## 1}, @code{@var{p} (@var{r}, @var{i}, :)} contains the coeffients for |
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34 ## the r-th polynomial defined on interval @var{i}. However, this is |
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35 ## stored as a 2-D array such that @code{@var{c} = reshape (@var{p} (:, |
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36 ## @var{j}), @var{n}, @var{d})} gives @code{@var{c} (@var{i}, @var{r})} |
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37 ## is the j-th coefficient of the r-th polynomial over the i-th interval. |
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38 ## @item @var{n} |
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39 ## Number of polynomial pieces. |
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40 ## @item @var{k} |
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41 ## Order of the polynomial plus 1. |
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42 ## @item @var{d} |
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43 ## Number of polynomials defined for each interval. |
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44 ## @end table |
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45 ## |
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46 ## @seealso{mkpp, ppval, spline} |
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47 ## @end deftypefn |
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48 |
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49 function [x, P, n, k, d] = unmkpp (pp) |
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50 if (nargin == 0) |
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51 print_usage (); |
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52 endif |
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53 if (! isstruct (pp)) |
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54 error ("unmkpp: expecting piecewise polynomial structure"); |
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55 endif |
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56 x = pp.x; |
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57 P = pp.P; |
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58 n = pp.n; |
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59 k = pp.k; |
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60 d = pp.d; |
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61 endfunction |
