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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301 USA. |
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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 ## @end deftypefn |
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25 ## |
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26 ## @seealso{polyval, polyvalm, poly, roots, conv, deconv, residue, |
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27 ## filter, polyderiv, polyinteg, and polyout} |
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28 |
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29 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu> |
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30 ## Created: June 1995 |
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31 |
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32 function tfout (num, denom, x) |
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33 |
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34 save_warn_empty_list_elements = warn_empty_list_elements; |
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35 unwind_protect |
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36 warn_empty_list_elements = 0; |
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37 |
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38 if (nargin < 2 ) | (nargin > 3) | (nargout != 0 ) |
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39 usage("tfout(num,denom[,x])"); |
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40 endif |
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41 |
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42 if ( (!isvector(num)) | (!isvector(denom)) ) |
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43 error("tfout: first two argument must be vectors"); |
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44 endif |
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45 |
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46 if (nargin == 2) |
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47 x = "s"; |
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48 elseif( ! ischar(x) ) |
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49 error("tfout: third argument must be a string"); |
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50 endif |
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51 |
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52 numstring = polyout(num,x); |
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53 denomstring = polyout(denom,x); |
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54 len = max(length(numstring),length(denomstring)); |
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55 if(len > 0) |
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56 y = strrep(blanks(len)," ","-"); |
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57 disp(numstring) |
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58 disp(y) |
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59 disp(denomstring) |
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60 else |
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61 error ("tfout: empty transfer function") |
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62 end |
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63 unwind_protect_cleanup |
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64 warn_empty_list_elements = save_warn_empty_list_elements; |
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65 end_unwind_protect |
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66 |
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67 endfunction |
