Re: Mathematica bug??
- To: mathgroup at smc.vnet.net
- Subject: [mg100565] Re: Mathematica bug??
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Mon, 8 Jun 2009 02:06:29 -0400 (EDT)
On 6/7/09 at 5:02 AM, oshaughn at gravity.psu.edu (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?
Here, I get:
In[4]:= {{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
Out[4]= {{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}}
In[5]:= $Version
Out[5]= 7.0 for Mac OS X x86 (64-bit) (February 19, 2009)
Perhaps there is a version or platform issue.