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annotate scripts/polynomial/unmkpp.m @ 20614:10ec79b47808

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use new string_value method to handle value extraction errors * __voronoi__.cc, chol.cc, colamd.cc, fftw.cc: Use new string_value method.
author John W. Eaton <jwe@octave.org>
date Thu, 08 Oct 2015 18:15:56 -0400
parents aa36fb998a4d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ## Copyright (C) 2000-2015 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 ##
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24 ## The components are:
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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 ## Sample points.
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29 ##
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30 ## @item @var{p}
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31 ## Polynomial coefficients for points in sample interval.
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32 ## @code{@var{p} (@var{i}, :)} contains the coefficients for the polynomial
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33 ## over interval @var{i} ordered from highest to lowest. If
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34 ## @code{@var{d} > 1}, @code{@var{p} (@var{r}, @var{i}, :)} contains the
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35 ## coefficients for the r-th polynomial defined on interval @var{i}.
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36 ##
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37 ## @item @var{n}
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38 ## Number of polynomial pieces.
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39 ##
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40 ## @item @var{k}
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41 ## Order of the polynomial plus 1.
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42 ##
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43 ## @item @var{d}
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44 ## Number of polynomials defined for each interval.
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45 ## @end table
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46 ##
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47 ## @seealso{mkpp, ppval, spline, pchip}
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48 ## @end deftypefn
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49
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50 function [x, P, n, k, d] = unmkpp (pp)
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51
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52 if (nargin != 1)
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53 print_usage ();
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54 endif
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55 if (! (isstruct (pp) && isfield (pp, "form") && strcmp (pp.form, "pp")))
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56 error ("unmkpp: PP must be a piecewise polynomial structure");
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57 endif
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58 x = pp.breaks;
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59 P = pp.coefs;
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60 n = pp.pieces;
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61 k = pp.order;
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62 d = pp.dim;
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63
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64 endfunction
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67 %!test
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68 %! b = 1:3;
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69 %! c = 1:24;
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70 %! pp = mkpp (b,c);
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71 %! [x, P, n, k, d] = unmkpp (pp);
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72 %! assert (x, b);
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73 %! assert (P, reshape (c, [2 12]));
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74 %! assert (n, 2);
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75 %! assert (k, 12);
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76 %! assert (d, 1);
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77
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78 ## Test input validation
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79 %!error unmkpp ()
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80 %!error unmkpp (1,2)
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81 %!error <piecewise polynomial structure> unmkpp (1)
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82 %!error <piecewise polynomial structure> unmkpp (struct ("field1", "pp"))
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83 %!error <piecewise polynomial structure> unmkpp (struct ("form", "not_a_pp"))
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