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Re: how to build pattern for a square matrix of reals?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98484] Re: how to build pattern for a square matrix of reals?
  • From: Raffy <raffy at mac.com>
  • Date: Fri, 10 Apr 2009 04:58:52 -0400 (EDT)
  • References: <grhp95$mj7$1@smc.vnet.net>

On Apr 8, 2:03 am, sagra... at gmail.com wrote:
> As in subject: how to build a pattern that will specify that given
> argument of a function has to be square matrix of reals?  Tried with
> following for "square matrix" part:
>   f[x_?MatrixQ[#] && Dimensions[#][[1]] == Dimensions[#][[2]]
> &] := ...
> but it doesn't seem to be working...
>
> Thanks.

squareRealMatrixQ[___] = False;
squareRealMatrixQ[m_?MatrixQ] := SameQ @@ Dimensions[m] && VectorQ[m,
Element[#, Reals] &];


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