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MathGroup Archive 2004

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a bug in Det of complex matrix - Mathematica 5

  • To: mathgroup at smc.vnet.net
  • Subject: [mg45879] a bug in Det of complex matrix - Mathematica 5
  • From: Petr Kujan <kujanp at fel.cvut.cz>
  • Date: Wed, 28 Jan 2004 05:19:25 -0500 (EST)
  • Reply-to: kujanp at fel.cvut.cz
  • Sender: owner-wri-mathgroup at wolfram.com

In Mathematica 5.0:

(* ERROR *)
mat = {{-1., 1.- 1. I}, {-1., -1. I}};
Det[mat]

(* Out[1]=   -1. + 1. I *)


(* CORRECT *)
rmat = Rationalize[mat];
Det[rmat]

(* Out[2]=   1 *)

-------
   Petr


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