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annotate scripts/control/system/__tfl__.m @ 4779:f105000ab25c

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[project @ 2004-02-17 02:34:33 by jwe]
author jwe
date Tue, 17 Feb 2004 02:34:33 +0000
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children 4c8a2e4e0717
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1 ## Copyright (C) 1996 Auburn University. All rights reserved.
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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 the
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7 ## Free Software Foundation; either version 2, or (at your option) any
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8 ## later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but WITHOUT
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11 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 ## 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 02111 USA.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} __tfl__ (@var{vec})
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21 ## used internally in tf.
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22 ## strip leading zero coefficients to get the true polynomial length
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23 ## @end deftypefn
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24
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25 function vec = __tfl__ (vec)
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26
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27 while (length (vec) > 1 && vec(1) == 0)
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28 vec = vec (2:end);
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29 endwhile
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30
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31 if (vec(1) == 0)
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32 warning ("tf: polynomial has no nonzero coefficients!")
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33 endif
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34
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35 endfunction