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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) |
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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)) |
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38 || ! (isvector (pol) || isempty(pol))) |
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39 error ("zer, pol must be vectors or empty"); |
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40 endif |
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41 |
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42 if (! isscalar(k)) |
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43 error("zpout: argument k must be a scalar.") |
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44 endif |
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45 |
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46 if (nargin == 3) |
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47 x = "s"; |
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48 elseif (! ischar (x)) |
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49 error ("zpout: third argument must be a string"); |
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50 endif |
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51 |
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52 numstring = num2str (k); |
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53 |
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54 if (length (zer)) |
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55 ## find roots at z,s = 0 |
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56 nzr = sum (zer == 0); |
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57 if (nzr) |
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58 if (nzr > 1) |
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59 numstring = sprintf ("%s %s^%d", numstring, x, nzr); |
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60 else |
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61 numstring = strcat (numstring, x); |
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62 endif |
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63 endif |
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64 zer = sortcom (-zer); |
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65 for ii = 1:length(zer) |
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66 if (zer(ii) != 0) |
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67 numstring = sprintf ("%s (%s %s)", numstring, x, com2str (zer(ii), 1)); |
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68 endif |
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69 endfor |
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70 endif |
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71 |
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72 if (length (pol)) |
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73 ## find roots at z,s = 0 |
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74 nzr = sum (pol == 0); |
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75 if (nzr) |
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76 if (nzr > 1) |
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77 denomstring = sprintf("%s^%d", x, nzr); |
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78 else |
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79 denomstring = sprintf ("%s", x); |
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80 endif |
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81 else |
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82 denomstring = " "; |
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83 endif |
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84 pol = sortcom (-pol); |
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85 for ii = 1:length(pol) |
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86 if (pol(ii) != 0) |
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87 denomstring = sprintf ("%s (%s %s)", denomstring, x, |
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88 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 endif |
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104 |
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105 endfunction |
