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annotate scripts/polynomial/polyreduce.m @ 3368:a4cd1e9d9962

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[project @ 1999-11-20 17:22:48 by jwe]
author jwe
date Sat, 20 Nov 1999 17:23:01 +0000
parents 44d82b369c78
children f8dde1807dee
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1 ## Copyright (C) 1996, 1997 John W. Eaton
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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, 59 Temple Place - Suite 330, Boston, MA
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18 ## 02111-1307, USA.
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} polyreduce (@var{c})
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22 ## Reduces a polynomial coefficient vector to a minimum number of terms by
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23 ## stripping off any leading zeros.
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24 ## @end deftypefn
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26 ## SEE ALSO: poly, roots, conv, deconv, residue, filter, polyval, polyvalm,
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27 ## polyderiv, polyinteg
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29 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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30 ## Created: June 1994
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31 ## Adapted-By: jwe
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33 function p = polyreduce (p)
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35 if (nargin != 1)
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36 usage ("polyreduce (p)");
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37 endif
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39 if (! (is_vector (p) || isempty (p)))
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40 error ("polyreduce: argument must be a vector");
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41 endif
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43 if (! isempty (p))
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45 index = find (p == 0);
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47 if (length (index) != 0)
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49 index = find (index == 1:length (index));
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51 if (length (index) != 0)
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53 if (length (p) > 1)
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54 p = p (index (length (index))+1:length (p));
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55 endif
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57 if (length (p) == 0)
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58 p = 0;
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59 endif
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60
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61 endif
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62
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63 endif
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65 endif
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67 endfunction