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MathGroup Archive 2004

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Re: a bug in Det of complex matrix - Mathematica 5

  • To: mathgroup at smc.vnet.net
  • Subject: [mg45906] Re: [mg45879] a bug in Det of complex matrix - Mathematica 5
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Thu, 29 Jan 2004 05:34:59 -0500 (EST)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200401281019.FAA18522@smc.vnet.net>
  • Reply-to: murray at math.umass.edu
  • Sender: owner-wri-mathgroup at wolfram.com

In Mathematica 5.0.1 it's OK:

   mat = {{-1., 1. - 1. I}, {-1., -1. I}};
   Det[mat]

1. + 0.*I

Petr Kujan wrote:

> 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
> 
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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