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Re: [Q] symbolic SVD?

  • To: mathgroup at
  • Subject: [mg26840] Re: [Q] symbolic SVD?
  • From: "Paul Lutus" <nospam at>
  • Date: Thu, 25 Jan 2001 01:13:19 -0500 (EST)
  • References: <94m9jq$>
  • Sender: owner-wri-mathgroup at

"James" <research at> wrote in message
news:94m9jq$3o7 at
> 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?

The values in the matrix must not be undefined variables, or variables with
infinite precision.


m = {{1.,2.},


"SingularValues[m] gives the singular value decomposition for a numerical
matrix m. "

Note the word "numerical."

Paul Lutus

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