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