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annotate scripts/polynomial/polyreduce.m @ 5642:2618a0750ae6

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[project @ 2006-03-06 21:26:48 by jwe]
author jwe
date Mon, 06 Mar 2006 21:26:54 +0000
parents 4c8a2e4e0717
children 34f96dd5441b
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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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18 ## 02110-1301, 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 ## @seealso{poly, roots, conv, deconv, residue, filter, polyval,
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25 ## polyvalm, polyderiv, polyinteg}
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26 ## @end deftypefn
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28 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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29 ## Created: June 1994
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30 ## Adapted-By: jwe
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32 function p = polyreduce (p)
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34 if (nargin != 1)
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35 usage ("polyreduce (p)");
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36 endif
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38 if (! (isvector (p) || isempty (p)))
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39 error ("polyreduce: argument must be a vector");
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40 endif
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42 if (! isempty (p) )
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44 index = find (p != 0);
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46 if (isempty (index))
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48 p = 0;
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50 else
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52 p = p (index (1):length (p));
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53
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54 endif
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56 endif
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57
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58 endfunction