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