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1 ## Copyright (C) 1996 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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19 |
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20 ## usage: polyreduce(c) |
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21 ## |
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22 ## Reduces a polynomial coefficient vector to a minimum number of terms, |
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23 ## i.e. it strips off any leading zeros. |
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24 ## |
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25 ## SEE ALSO: poly, roots, conv, deconv, residue, filter, polyval, polyvalm, |
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26 ## polyderiv, polyinteg |
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27 |
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28 ## Author: Tony Richardson <amr@mpl.ucsd.edu> |
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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 index = find (p == 0); |
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35 |
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36 if (length (index) != 0) |
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37 |
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38 index = find (index == 1:length (index)); |
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39 |
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40 if (length (index) != 0) |
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41 |
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42 if (length (p) > 1) |
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43 p = p (index (length (index))+1:length (p)); |
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44 endif |
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45 |
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46 if (length (p) == 0) |
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47 p = 0; |
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48 endif |
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49 |
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50 endif |
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51 |
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52 endif |
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53 |
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54 endfunction |
