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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{wsys} =} 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 H2/H_infinity design procedure. |
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24 ## These function are part of thye augmented plant P (see hinfdemo |
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25 ## for an applicattion example). |
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26 ## |
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27 ## vl = Gain @@ low frequencies |
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28 ## |
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29 ## vh = Gain @@ high frequencies |
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30 ## |
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31 ## fc = Corner frequency (in Hz, *not* in rad/sec) |
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32 ## @end deftypefn |
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33 |
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34 function wsys = wgt1o(vl, vh, fc) |
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35 ## Written by Kai P. Mueller September 30, 1997 |
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36 |
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37 if (nargin != 3) |
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38 usage("wsys = wgt1o(vl, vh, fc)"); |
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39 endif |
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40 |
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41 if(nargout > 1) |
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42 usage("wsys = wgt1o(vl, vh, fc)"); |
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43 endif |
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44 |
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45 if (vl == vh) |
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46 a = []; |
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47 b = []; |
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48 c = []; |
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49 else |
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50 a = [-2*pi*fc]; |
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51 b = [-2*pi*fc]; |
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52 c = [vh-vl]; |
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53 endif |
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54 d=[vh]; |
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55 |
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56 wsys = ss2sys(a,b,c,d); |
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57 endfunction |
