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1 ## Copyright (C) 1996, 2000, 2002, 2003, 2004, 2005, 2006, 2007 |
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2 ## Auburn University. All rights reserved. |
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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} {} tfout (@var{num}, @var{denom}, @var{x}) |
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22 ## Print formatted transfer function @math{n(s)/d(s)} to the screen. |
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23 ## @var{x} defaults to the string @code{"s"} |
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24 ## @seealso{polyval, polyvalm, poly, roots, conv, deconv, residue, |
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25 ## filter, polyderiv, polyinteg, polyout} |
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26 ## @end deftypefn |
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27 |
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28 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu> |
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29 ## Created: June 1995 |
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30 |
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31 function tfout (num, denom, x) |
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32 |
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33 if (nargin < 2 || nargin > 3) |
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34 print_usage (); |
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35 endif |
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36 |
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37 if (! isvector (num) || ! isvector (denom)) |
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38 error ("tfout: first two argument must be vectors"); |
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39 endif |
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40 |
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41 if (nargin == 2) |
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42 x = "s"; |
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43 elseif (! ischar (x)) |
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44 error ("tfout: third argument must be a string"); |
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45 endif |
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46 |
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47 numstring = polyout (num, x); |
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48 denomstring = polyout (denom, x); |
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49 len = max (length (numstring), length (denomstring)); |
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50 if (len > 0) |
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51 y = strrep (blanks (len), " ", "-"); |
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52 disp (numstring) |
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53 disp (y) |
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54 disp (denomstring) |
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55 else |
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56 error ("tfout: empty transfer function") |
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57 endif |
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58 |
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59 endfunction |
