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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98403] Re: [mg98379] how to build pattern for a square matrix of reals?
  • From: "David Park" <djmpark at comcast.net>
  • Date: Thu, 9 Apr 2009 05:52:46 -0400 (EDT)
  • References: <21689449.1239182166287.JavaMail.root@n11>

f[m : {{_Real ..} ..} /; 
   Length[Dimensions[m]] == 2 \[And] 
    Equal @@ 
     Dimensions[m]] := "You have entered a real square matrix."

f[{{1, 2}, {3, 4}} // N]

f[{{1, 2}, {3, 4, 5}} // N]

f[{{1, 2}, {3, 4}}]


David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/  


From: sagrailo at gmail.com [mailto:sagrailo at gmail.com] 

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.




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