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MathGroup Archive 2002

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Re: redefine Power[A_?MatrixQ,-1]

  • To: mathgroup at
  • Subject: [mg32629] Re: [mg32593] redefine Power[A_?MatrixQ,-1]
  • From: Mianlai Zhou <lailai at>
  • Date: Fri, 1 Feb 2002 02:02:31 -0500 (EST)
  • Sender: owner-wri-mathgroup at

Hi, it does not work because the internal attribute Listable of Power
takes the priority.

To make it work, just add the command

ClearAttributes[Power, Listable]

before your Power[A_?MatrixQ,-1] := Inverse[A] .

Good Luck!

Mianlai Zhou
Theory Group, NIKHEF
Amsterdam, The Netherlands

On Thu, 31 Jan 2002, Cyril Fischer wrote:

> Hi,
> How can I redefine Power[A_?MatrixQ,-1] := Inverse[A] ?
> Issuing
> Unprotect[Power];
> Power[A_?MatrixQ,-1] := Inverse[A]
> does not work.
> Thanks, Cyril

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