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  • Committer: Bazaar Package Importer
  • Author(s): Torsten Werner
  • Date: 2002-03-21 16:57:43 UTC
  • Revision ID: james.westby@ubuntu.com-20020321165743-e9mv12c1tb1plztg
Tags: upstream-2.6
Import upstream version 2.6

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macros/robust/entropy.sci
 
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function [enx,X,Y,eny]=entropy(S,gama)
 
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//Computation of the entropy at gama of a linear system S
 
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//[enx,X,Y,eny]=entropy(S,gama)
 
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//!
 
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//
 
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// Copyright INRIA
 
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S1=S(1);
 
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if S1(1)=='r' then S=tf2ss(S);end
 
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[A,B,C,D]=S(2:5);
 
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g1=1/gama;
 
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H=[A,g1*B*B';-g1*C'*C,-A'];
 
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[X,zero]=ric_desc(H);             //zero=A'*X+X*A+g1*g1*X*B*B'*X+C'*C;
 
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enx=sum(diag(X*B*B'));
 
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J=[A',g1*C'*C;-g1*B*B',-A];
 
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[Y,zero]=ric_desc(J);            //zero=A*Y+Y*A'+g1*g1*Y*C'*C*Y+B*B'
 
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eny=sum(diag(Y*C'*C));
 
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