Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2009

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

Search the Archive

Re: Inverse of a Big Matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96851] Re: Inverse of a Big Matrix
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Thu, 26 Feb 2009 07:54:50 -0500 (EST)
  • References: <go31lo$fds$1@smc.vnet.net>

This has nothing to do with the size of your matrix.

Inverse[{{1., 1.}, {0.99999999999999, 1}}] also yields the same
error.

The warning is simply informing you that small changes in the input
can have a major impact on the result and that you should be very
cautious proceeding with it.

Cheers -- Sjoerd

On Feb 25, 11:06 am, Gregory Lypny <gregory.ly... at videotron.ca> wrote:
> Hello everyone,
>
> I'm computing the inverse of a big matrix, 500 x 500.  Well, maybe not 
> that big, but I'm getting the error message
>
>         "General::luc: Result for `1` of badly conditioned matrix `2` may  
> contain significant numerical errors. >>"
>
> and I'm wondering if anyone can suggest a workaround.  All I can say 
> is that the determinant is very small (-4.327475016428501*10^-1947),  
> and that I can compute the inverse of various submatrices of size 100  
> x100.
>
> Regards,
>
>         Gregory



  • Prev by Date: Re: Exporting data into a file, OpenWrite
  • Next by Date: Re: N00b help needed: Graphics
  • Previous by thread: Re: Inverse of a Big Matrix
  • Next by thread: Re: Inverse of a Big Matrix