Path: news.mathworks.com!not-for-mail
From: "Pascal Gahinet" <pascal@mathworks.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: a question about lmi
Date: Wed, 21 Jan 2009 20:39:52 -0500
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Hi Xiao

This is not an LMI if it depends on both X and inv(X). The L stands for 
"linear" (with respect to X). May be there is a way to rewrite it as a 
linear expression in X

HTH
- pascal

"Xiao Ma" <xma4@utk.edu> wrote in message 
news:gl62tu$mik$1@fred.mathworks.com...
>I have two Lmis to solve,and I use lmi toolbox.
>
> The question is:
> the first lmi I use a matrix variable X(s.t lmi(1,[4,1])).
> but in the second lmi,I have to use the inverse of the variable X.
> How can I represent the inverse of variable X in the second without define 
> a new variable?
>
> Thanks for help