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MathGroup Archive 2009

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Re: Length of a held expression

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96564] Re: Length of a held expression
  • From: Raffy <raffy at mac.com>
  • Date: Mon, 16 Feb 2009 06:59:43 -0500 (EST)
  • References: <gn8jdj$7qa$1@smc.vnet.net>

Remember, Hold[{b,3}] is really just Hold[List[b,3]].

And what you're looking for is something like: Length[Hold[b,3]].

So replace head List with Hold, and head Hold with Length.

Length @@ Hold @@@ Hold[{b,3}]


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