Mercurial > hg > octave-lyh
annotate scripts/deprecated/polyderiv.m @ 17535:c12c688a35ed default tip lyh
Fix warnings
| author | LYH <lyh.kernel@gmail.com> |
|---|---|
| date | Fri, 27 Sep 2013 17:43:27 +0800 |
| parents | 1c89599167a6 |
| children |
| rev | line source |
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maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1994-2012 John W. Eaton |
| 2313 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
| 8 ## your option) any later version. | |
| 2313 | 9 ## |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 7016 | 16 ## along with Octave; see the file COPYING. If not, see |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 904 | 18 |
| 3368 | 19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} polyderiv (@var{p}) |
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21 ## @deftypefnx {Function File} {[@var{k}] =} polyderiv (@var{a}, @var{b}) |
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22 ## @deftypefnx {Function File} {[@var{q}, @var{d}] =} polyderiv (@var{b}, @var{a}) |
| 3368 | 23 ## Return the coefficients of the derivative of the polynomial whose |
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parents:
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24 ## coefficients are given by the vector @var{p}. If a pair of polynomials |
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Rik <octave@nomad.inbox5.com>
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25 ## is given, return the derivative of the product @math{@var{a}*@var{b}}. |
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26 ## If two inputs and two outputs are given, return the derivative of the |
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27 ## polynomial quotient @math{@var{b}/@var{a}}. The quotient numerator is |
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28 ## in @var{q} and the denominator in @var{d}. |
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29 ## @seealso{poly, polyint, polyreduce, roots, conv, deconv, residue, |
| 5642 | 30 ## filter, polygcd, polyval, polyvalm} |
| 3368 | 31 ## @end deftypefn |
| 1025 | 32 |
| 3202 | 33 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
| 2312 | 34 ## Created: June 1994 |
| 35 ## Adapted-By: jwe | |
| 561 | 36 |
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37 function [q, d] = polyderiv (p, a) |
| 5216 | 38 |
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39 persistent warned = false; |
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40 if (! warned) |
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41 warned = true; |
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42 warning ("Octave:deprecated-function", |
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43 "polyderiv is obsolete and will be removed from a future version of Octave; please use polyder instead"); |
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parents:
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44 endif |
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Rik <octave@nomad.inbox5.com>
parents:
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45 |
| 5217 | 46 if (nargin == 1 || nargin == 2) |
| 47 if (! isvector (p)) | |
| 5216 | 48 error ("polyderiv: argument must be a vector"); |
| 49 endif | |
| 5217 | 50 if (nargin == 2) |
| 51 if (! isvector (a)) | |
| 10549 | 52 error ("polyderiv: argument must be a vector"); |
| 5217 | 53 endif |
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all script files: untabify and strip trailing whitespace
John W. Eaton <jwe@octave.org>
parents:
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diff
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54 if (nargout == 1) |
| 10549 | 55 ## derivative of p*a returns a single polynomial |
| 56 q = polyderiv (conv (p, a)); | |
| 5217 | 57 else |
| 10549 | 58 ## derivative of p/a returns numerator and denominator |
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parents:
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59 d = conv (a, a); |
| 10549 | 60 if (numel (p) == 1) |
| 61 q = -p * polyderiv (a); | |
| 62 elseif (numel (a) == 1) | |
| 63 q = a * polyderiv (p); | |
| 64 else | |
| 65 q = conv (polyderiv (p), a) - conv (p, polyderiv (a)); | |
| 66 q = polyreduce (q); | |
| 67 endif | |
| 5217 | 68 |
| 10549 | 69 ## remove common factors from numerator and denominator |
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parents:
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70 x = polygcd (q, d); |
| 10549 | 71 if (length(x) != 1) |
| 72 q = deconv (q, x); | |
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Rik <octave@nomad.inbox5.com>
parents:
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73 d = deconv (d, x); |
| 10549 | 74 endif |
| 5217 | 75 |
| 10549 | 76 ## move all the gain into the numerator |
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Rik <octave@nomad.inbox5.com>
parents:
10687
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77 q = q/d(1); |
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Rik <octave@nomad.inbox5.com>
parents:
10687
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changeset
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78 d = d/d(1); |
| 5217 | 79 endif |
| 5216 | 80 else |
| 5217 | 81 lp = numel (p); |
| 82 if (lp == 1) | |
| 10549 | 83 q = 0; |
| 84 return; | |
| 5217 | 85 elseif (lp == 0) |
| 10549 | 86 q = []; |
| 87 return; | |
| 5216 | 88 endif |
| 561 | 89 |
| 5217 | 90 ## Force P to be a row vector. |
| 91 p = p(:).'; | |
| 5135 | 92 |
| 5217 | 93 q = p(1:(lp-1)) .* [(lp-1):-1:1]; |
| 5216 | 94 endif |
| 95 else | |
| 6046 | 96 print_usage (); |
| 5216 | 97 endif |
| 561 | 98 |
| 7411 | 99 endfunction |
| 5217 | 100 |
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101 |
| 7411 | 102 %!assert(all (all (polyderiv ([1, 2, 3]) == [2, 2]))); |
| 103 | |
| 104 %!assert(polyderiv (13) == 0); | |
| 105 | |
| 106 %!error polyderiv ([]); | |
| 107 | |
| 108 %!error polyderiv ([1, 2; 3, 4]); | |
| 109 |