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MathGroup Archive 2005

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Re: Re: Why does Inverse[M] hesitate?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54437] Re: [mg54373] Re: Why does Inverse[M] hesitate?
  • From: Chris Chiasson <chris.chiasson at gmail.com>
  • Date: Sun, 20 Feb 2005 00:10:11 -0500 (EST)
  • References: <2yubw11qremo@legacy> <200502190732.CAA06130@smc.vnet.net>
  • Reply-to: Chris Chiasson <chris.chiasson at gmail.com>
  • Sender: owner-wri-mathgroup at wolfram.com

The reason for the "unevaluated" commands is that, in the first case,
you have not actually supplied a nested list to the Inverse function.
I know the description for MatrixForm says it does not affect
evaluation... It does not affect evaluation of whatever is inside of
it. It does affect the evaluation of things outside of it.

Essentially, your command is like saying:

Inverse[RANDOMFUNCTIONNAME[{{a,b,c},{d,e,f},{h,i,j}}]]

An easy way to get around this is to make sure A is not set to MatrixForm[blah].

Try

(A=blah)//MatrixForm

Regards,


On Sat, 19 Feb 2005 02:32:37 -0500 (EST), highegg <highegg at centrum.cz> wrote:
> On 18 Feb 05 11:38:34 -0500 (EST), Skirmantas wrote:
> >I'm puzzled by the following in Mathematica 5.0 and 5.1:
> >If I define a symbolic matrix A and a symbolic matrix B and ask to
> >calculate Inverse[A].B, the output is the same input operation with
> >the A and B expanded. I have re-input this output, I finally get the
> >result.
> 
> I'm not quite sure that I understood the problem well.
> Can you post the code, please?
> 
> regards,
> Jaroslav
> 
> 


-- 
Chris Chiasson
Kettering University
Mechanical Engineering
Graduate Student
1 810 265 3161


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