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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} {} zpout (@var{zer}, @var{pol}, @var{k}, @var{x}) |
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21 ## print formatted zero-pole form to the screen. |
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22 ## @var{x} defaults to the string @code{"s"} |
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23 ## @end deftypefn |
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24 ## @seealso{polyval, polyvalm, poly, roots, conv, deconv, residue, |
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25 ## filter, polyderiv, polyinteg, and polyout} |
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26 |
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27 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu> |
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28 ## Created: June 1995 |
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29 |
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30 function zpout (zer, pol, k, x) |
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31 |
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32 save_empty = empty_list_elements_ok; |
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33 empty_list_elements_ok = 1; |
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34 |
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35 if (nargin < 3 ) | (nargin > 4) | (nargout != 0 ) |
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36 usage("zpout(zer,pol,k[,x])"); |
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37 endif |
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38 |
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39 if( !(isvector(zer) | isempty(zer)) | !(isvector(pol) | isempty(pol)) ) |
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40 error("zer, pol must be vectors or empty"); |
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41 endif |
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42 |
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43 if(!isscalar(k)) |
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44 error("zpout: argument k must be a scalar.") |
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45 endif |
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46 |
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47 if (nargin == 3) |
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48 x = "s"; |
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49 elseif( ! isstr(x) ) |
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50 error("zpout: third argument must be a string"); |
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51 endif |
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52 |
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53 numstring = num2str(k); |
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54 |
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55 if(length(zer)) |
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56 ## find roots at z,s = 0 |
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57 nzr = sum(zer == 0); |
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58 if(nzr) |
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59 if(nzr > 1) |
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60 numstring = [numstring,sprintf(" %s^%d",x,nzr)]; |
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61 else |
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62 numstring = [numstring,sprintf(" %s",x)]; |
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63 endif |
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64 endif |
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65 zer = sortcom(-zer); |
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66 for ii=1:length(zer) |
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67 if(zer(ii) != 0) |
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68 numstring = [numstring,sprintf(" (%s %s)",x,com2str(zer(ii),1) ) ]; |
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69 endif |
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70 endfor |
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71 endif |
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72 |
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73 if(length(pol)) |
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74 ## find roots at z,s = 0 |
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75 nzr = sum(pol == 0); |
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76 if(nzr) |
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77 if(nzr > 1) |
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78 denomstring = [sprintf("%s^%d",x,nzr)]; |
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79 else |
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80 denomstring = [sprintf("%s",x)]; |
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81 endif |
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82 else |
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83 denomstring = " "; |
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84 endif |
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85 pol = sortcom(-pol); |
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86 for ii=1:length(pol) |
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87 if(pol(ii) != 0) |
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88 denomstring = [denomstring,sprintf(" (%s %s)",x,com2str(pol(ii),1))]; |
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89 endif |
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90 endfor |
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91 endif |
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92 |
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93 len = max(length(numstring),length(denomstring)); |
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94 if(len > 0) |
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95 y = strrep(blanks(len)," ","-"); |
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96 disp(numstring) |
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97 if(length(denomstring)) |
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98 disp(y) |
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99 disp(denomstring) |
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100 endif |
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101 else |
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102 error ("zpout: empty transfer function") |
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103 end |
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104 |
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105 empty_list_elements_ok = save_empty; |
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106 |
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107 endfunction |
