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MathGroup Archive 2005

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Re: Why does Inverse[M] hesitate?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54620] Re: Why does Inverse[M] hesitate?
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 24 Feb 2005 03:21:23 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <cv6t0c$6re$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

remove the MatrixForm[], it is just a wrapper for display, and
not to indicate that you have a matrix.
If you would like to see a list of lists as matrix switch the
default ouptut format to TraditionalForm[]

Regards
  Jens

"Skirmantas" <skirmantas.janusonis at yale.edu> schrieb im Newsbeitrag 
news:cv6t0c$6re$1 at smc.vnet.net...
> The Inverse function sometimes calculates the inverse of a matrix
> immediately, sometimes it does not. Try this example in Mathematica
> 5.1:
>
> A={{(1-g)-1,1},{-w P(1-g)/C,-1}}//MatrixForm
> B={{0},{-P(w+1)}}//MatrixForm
>
> I get
> Out: Inverse[(expanded A)].(expanded B)
>
> If I do just
> A={{a,b},{c,d}}
> B={{e},{f}}
> Inverse[A].B
>
> I get the final correct result.
> 



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