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Re: Inverse of a Big Matrix

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

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

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

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 < at> 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

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