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annotate scripts/polynomial/unmkpp.m @ 14383:07c55bceca23 stable

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Fix guarded_eval() subfunction in fminunc (bug #35534). * fminunc.m: Fix guarded_eval() subfunction in fminunc (bug #35534).
author Olaf Till <olaf.till@uni-jena.de>
date Wed, 15 Feb 2012 14:44:37 +0100
parents 72c96de7a403
children d63878346099
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2000-2012 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 piecewise polynomial structure @var{pp}.
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23 ## The components are:
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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 ##
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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 coefficients for
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34 ## the r-th polynomial defined on interval @var{i}.
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35 ##
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36 ## @item @var{n}
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37 ## Number of polynomial pieces.
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38 ##
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39 ## @item @var{k}
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40 ## Order of the polynomial plus 1.
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41 ##
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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, pchip}
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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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51 if (nargin != 1)
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52 print_usage ();
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53 endif
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54 if (! (isstruct (pp) && isfield (pp, "form") && strcmp (pp.form, "pp")))
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55 error ("unmkpp: PP must be a piecewise polynomial structure");
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56 endif
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57 x = pp.breaks;
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58 P = pp.coefs;
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59 n = pp.pieces;
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60 k = pp.order;
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61 d = pp.dim;
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62
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63 endfunction
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66 %!test
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67 %! b = 1:3;
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68 %! c = 1:24;
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69 %! pp = mkpp (b,c);
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70 %! [x, P, n, k, d] = unmkpp (pp);
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71 %! assert (x, b);
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72 %! assert (P, reshape (c, [2 12]));
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73 %! assert (n, 2);
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74 %! assert (k, 12);
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75 %! assert (d, 1);
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76
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77 %% Test input validation
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78 %!error unmkpp ()
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79 %!error unmkpp (1,2)
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80 %!error <piecewise polynomial structure> unmkpp (1)
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81 %!error <piecewise polynomial structure> unmkpp (struct ("field1", "pp"))
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82 %!error <piecewise polynomial structure> unmkpp (struct ("form", "not_a_pp"))
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83