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Re: wrong answer or no answer?

• To: mathgroup at smc.vnet.net
• Subject: [mg82724] Re: [mg82710] wrong answer or no answer?
• From: Daniel Lichtblau <danl at wolfram.com>
• Date: Tue, 30 Oct 2007 03:20:26 -0500 (EST)
• References: <200710291054.FAA06915@smc.vnet.net>

Roger Bagula wrote:
> M = {{-1, I}, {I, 1}}
> MatrixPower[M, 1/2]
> gives
> {{0, 0}, {0, 0}}
> [...]
> 
> All this leaves me really puzzled.
> Usually Mathematica takes away my doubts,
> but here it isn't any help at all.
> Maybe it is a paradox?
> Roger Bagula

The MatrixPower result is a bug, which we will investigate.

Daniel Lichtblau
Wolfram Research

• References:
  • wrong answer or no answer?
    • From: Roger Bagula <rlbagula@sbcglobal.net>