Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2001
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2001

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: [Q] symbolic SVD?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg26840] Re: [Q] symbolic SVD?
  • From: "Paul Lutus" <nospam at nosite.com>
  • Date: Thu, 25 Jan 2001 01:13:19 -0500 (EST)
  • References: <94m9jq$3o7@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"James" <research at proton.csl.uiuc.edu> wrote in message
news:94m9jq$3o7 at smc.vnet.net...
>
>
> 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.

Try:

m = {{1.,2.},
     {3.,4.},
     {5.,6.}}

SingularValues[m]


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

Note the word "numerical."

--
Paul Lutus
www.arachnoid.com





  • Prev by Date: Re: [Q] symbolic SVD?
  • Next by Date: Re: triangles in circles
  • Previous by thread: Re: [Q] symbolic SVD?
  • Next by thread: RE: [Q] symbolic SVD?