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1 ## Copyright (C) 1998 Kai P. Mueller |
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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} {@var{W} =} wgt1o (@var{vl}, @var{vh}, @var{fc}) |
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21 ## State space description of a first order weighting function. |
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22 ## |
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23 ## Weighting function are needed by the |
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24 ## @iftex |
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25 ## @tex |
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26 ## $ { \cal H }_2 / { \cal H }_\infty $ |
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27 ## @end tex |
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28 ## @end iftex |
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29 ## @ifinfo |
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30 ## H-2/H-infinity |
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31 ## @end ifinfo |
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32 ## design procedure. |
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33 ## These function are part of the augmented plant @var{P} |
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34 ## (see @command{hinfdemo} for an application example). |
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35 ## |
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36 ## @strong{Inputs} |
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37 ## @table @var |
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38 ## @item vl |
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39 ## Gain at low frequencies. |
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40 ## @item vh |
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41 ## Gain at high frequencies. |
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42 ## @item fc |
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43 ## Corner frequency (in Hz, @strong{not} in rad/sec) |
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44 ## @end table |
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45 ## |
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46 ## @strong{Output} |
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47 ## @table @var |
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48 ## @item W |
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49 ## Weighting function, given in form of a system data structure. |
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50 ## @end table |
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51 ## @end deftypefn |
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52 |
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53 ## Author: Kai P. Mueller <mueller@ifr.ing.tu-bs.de> |
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54 ## Created: September 30, 1997 |
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55 |
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56 function wsys = wgt1o (vl, vh, fc) |
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57 |
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58 if (nargin != 3) |
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59 usage("wsys = wgt1o(vl, vh, fc)"); |
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60 endif |
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61 |
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62 if(nargout > 1) |
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63 usage("wsys = wgt1o(vl, vh, fc)"); |
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64 endif |
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65 |
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66 if (vl == vh) |
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67 a = []; |
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68 b = []; |
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69 c = []; |
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70 else |
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71 a = [-2*pi*fc]; |
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72 b = [-2*pi*fc]; |
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73 c = [vh-vl]; |
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74 endif |
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75 d=[vh]; |
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76 |
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77 wsys = ss(a,b,c,d); |
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78 endfunction |
