Re: Mathematica bug??
- To: mathgroup at smc.vnet.net
- Subject: [mg100570] Re: Mathematica bug??
- From: David Bailey <dave at removedbailey.co.uk>
- Date: Mon, 8 Jun 2009 02:07:25 -0400 (EDT)
- References: <h0fvlb$rct$1@smc.vnet.net>
oshaughn 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?
>
This gives the expected result with 7.0.1 on 64-bit Windows. What
version of Mathematica are you using?
David Bailey
http://www.dbaileyconsultancy.co.uk