Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2009

[Date Index] [Thread Index] [Author Index]

Search the Archive

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


  • Prev by Date: Re: Mathematica bug??
  • Next by Date: Re: Rasterize off by one pixel
  • Previous by thread: Mathematica bug??
  • Next by thread: Re: Mathematica bug??