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1 ## Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2004, |
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2 ## 2005, 2006, 2007 John W. Eaton |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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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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27 |
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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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31 |
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32 function p = polyreduce (p) |
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33 |
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34 if (nargin != 1) |
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35 print_usage (); |
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36 endif |
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37 |
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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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41 |
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42 if (! isempty (p)) |
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43 |
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44 index = find (p != 0); |
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45 |
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46 if (isempty (index)) |
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47 |
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48 p = 0; |
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49 |
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50 else |
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51 |
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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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55 |
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56 endif |
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57 |
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58 endfunction |
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59 |
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60 %!assert(all (all (polyreduce ([0, 0, 1, 2, 3]) == [1, 2, 3]))); |
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61 |
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62 %!assert(all (all (polyreduce ([1, 2, 3, 0, 0]) == [1, 2, 3, 0, 0]))); |
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63 |
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64 %!assert(all (all (polyreduce ([1, 0, 3]) == [1, 0, 3]))); |
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65 |
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66 %!assert(isempty (polyreduce ([]))); |
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67 |
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68 %!error polyreduce ([1, 2; 3, 4]); |
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69 |
