Re: Mathematica bug??
- To: mathgroup at smc.vnet.net
- Subject: [mg100554] Re: [mg100540] Mathematica bug??
- From: DrMajorBob <btreat1 at austin.rr.com>
- Date: Mon, 8 Jun 2009 02:04:28 -0400 (EDT)
- References: <200906070902.FAA28100@smc.vnet.net>
- Reply-to: drmajorbob at bigfoot.com
It works fine here:
{{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
{{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}}
$Version
"7.0 for Mac OS X x86 (64-bit) (February 19, 2009)"
Bobby
On Sun, 07 Jun 2009 04:02:16 -0500, oshaughn <oshaughn 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?
>
--
DrMajorBob at bigfoot.com
- References:
- Mathematica bug??
- From: oshaughn <oshaughn@gravity.psu.edu>
- Mathematica bug??