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MathGroup Archive 2001

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Re: [Q] symbolic SVD?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg26819] Re: [mg26809] [Q] symbolic SVD?
  • From: Jean-Marie THOMAS <jmt at agat.net>
  • Date: Thu, 25 Jan 2001 01:13:03 -0500 (EST)
  • References: <200101240918.EAA03610@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

The HelpBrowser specifies, for SingularValues, that this function applies 
ONLY on numerical matrices.

If you want to get singular values for a symbolic matrix, you will have to 
implement your own algorithm, e.g. compute the det of m-lamba identity and 
find the roots of the resulting polynomial.

On Wednesday 24 January 2001 10:18, James wrote:
Sorry about reposting.
I've not received any reply yet,
and I tried several ways, but I couldn't get a clue, either.
So if anyone can help, that would be appreciated.

-------------------------------------------------------------

I've used 'symbolic' calculation in mathematica in many ways,
but this time,
I wonder if mathematica can solve symbolic matrix operation.
Specifically,

   m = {{a, b},
        {c, d},
        {e, f}}

   SingluarValues[m]

returns

  SingularValues::"svdf": "SingularValues has received a matrix
          with infinite precision."

(a,b,c,d,e,f are all symbolics.)
I need to do several symbolic matrix operations such as SingularValues.
Is there any way to do that?
Thank you.


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