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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} {} zpout (@var{zer}, @var{pol}, @var{k}, @var{x}) |
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22 ## print formatted zero-pole form 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 zpout (zer, pol, k, x) |
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32 |
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33 if (nargin < 3 ) | (nargin > 4) | (nargout != 0 ) |
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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(zer) | isempty(zer)) | !(isvector(pol) | isempty(pol)) ) |
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38 error("zer, pol must be vectors or empty"); |
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39 endif |
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40 |
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41 if(!isscalar(k)) |
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42 error("zpout: argument k must be a scalar.") |
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43 endif |
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44 |
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45 if (nargin == 3) |
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46 x = "s"; |
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47 elseif( ! ischar(x) ) |
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48 error("zpout: third argument must be a string"); |
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49 endif |
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50 |
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51 numstring = num2str(k); |
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52 |
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53 if(length(zer)) |
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54 ## find roots at z,s = 0 |
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55 nzr = sum(zer == 0); |
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56 if(nzr) |
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57 if(nzr > 1) |
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58 numstring = [numstring,sprintf(" %s^%d",x,nzr)]; |
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59 else |
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60 numstring = [numstring,sprintf(" %s",x)]; |
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61 endif |
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62 endif |
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63 zer = sortcom(-zer); |
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64 for ii=1:length(zer) |
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65 if(zer(ii) != 0) |
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66 numstring = [numstring,sprintf(" (%s %s)",x,com2str(zer(ii),1) ) ]; |
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67 endif |
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68 endfor |
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69 endif |
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70 |
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71 if(length(pol)) |
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72 ## find roots at z,s = 0 |
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73 nzr = sum(pol == 0); |
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74 if(nzr) |
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75 if(nzr > 1) |
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76 denomstring = [sprintf("%s^%d",x,nzr)]; |
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77 else |
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78 denomstring = [sprintf("%s",x)]; |
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79 endif |
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80 else |
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81 denomstring = " "; |
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82 endif |
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83 pol = sortcom(-pol); |
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84 for ii=1:length(pol) |
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85 if(pol(ii) != 0) |
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86 denomstring = [denomstring,sprintf(" (%s %s)",x,com2str(pol(ii),1))]; |
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87 endif |
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88 endfor |
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89 endif |
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90 |
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91 len = max(length(numstring),length(denomstring)); |
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92 if(len > 0) |
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93 y = strrep(blanks(len)," ","-"); |
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94 disp(numstring) |
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95 if(length(denomstring)) |
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96 disp(y) |
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97 disp(denomstring) |
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98 endif |
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99 else |
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100 error ("zpout: empty transfer function") |
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101 end |
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102 |
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103 endfunction |
