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annotate scripts/polynomial/polyreduce.m @ 20830:b65888ec820e draft default tip gccjit

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dmalcom gcc jit import
author Stefan Mahr <dac922@gmx.de>
date Fri, 27 Feb 2015 16:59:36 +0100
parents 4197fc428c7d
children
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4197fc428c7d maint: Update copyright notices for 2015.
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1 ## Copyright (C) 1994-2015 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 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} {} polyreduce (@var{c})
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21 ## Reduce a polynomial coefficient vector to a minimum number of terms by
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22 ## stripping off any leading zeros.
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23 ## @seealso{polyout}
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24 ## @end deftypefn
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26 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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27 ## Created: June 1994
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28 ## Adapted-By: jwe
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30 function p = polyreduce (c)
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32 if (nargin != 1)
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33 print_usage ();
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34 elseif (! isvector (c) || isempty (c))
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35 error ("polyreduce: C must be a non-empty vector");
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36 endif
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38 idx = find (c != 0, 1);
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40 if (isempty (idx))
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41 p = 0;
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42 else
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43 p = c(idx:end);
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44 endif
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45
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46 endfunction
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49 %!assert (polyreduce ([0, 0, 1, 2, 3]), [1, 2, 3])
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50 %!assert (polyreduce ([1, 2, 3, 0, 0]), [1, 2, 3, 0, 0])
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51 %!assert (polyreduce ([1, 0, 3]), [1, 0, 3])
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52 %!assert (polyreduce ([0, 0, 0]), 0)
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54 %!error polyreduce ()
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55 %!error polyreduce (1, 2)
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56 %!error <C must be a non-empty vector> polyreduce ([1, 2; 3, 4])
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57 %!error <C must be a non-empty vector> polyreduce ([])
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