Re: Mathematica bug??
- To: mathgroup at smc.vnet.net
- Subject: [mg100561] Re: Mathematica bug??
- From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
- Date: Mon, 8 Jun 2009 02:05:46 -0400 (EDT)
- References: <h0fvlb$rct$1@smc.vnet.net>
I get a different answer:
{{1/Sqrt[1 - 2/r], 0, 0, 0}, {0, Sqrt[1 - 2/r], 0, 0}, {0, 0, 1/r,
0}, {0, 0, 0, Csc[\[Theta]]/r}}
This is the correct answer. What version of Mathematica were you
using? Have you tried this on a fresh kernel?
Cheers -- Sjoerd
On Jun 7, 11:01 am, oshaughn <oshau... at gravity.psu.edu> wrote:
> {{Sqrt[1 - 2/r], 0, 0, 0}, {0, 1/Sqrt[1 - 2/r], 0, 0}, {0, 0, r,
> 0}, {0, 0, 0, r Sin[\[Theta]]}} // Inverse
>
> gives
>
> {{0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 1/r, 0}, {0, 0, 0, Csc[\[Theta]]/
> r}}
>
> with no warnings. This is a *diagonal* matrix that should be
> trivially invertible.
>
> Does anyone know why Inverse has catastrophically failed here?