Re: Length of a held expression
- To: mathgroup at smc.vnet.net
- Subject: [mg96528] Re: [mg96524] Length of a held expression
- From: "David Park" <djmpark at comcast.net>
- Date: Mon, 16 Feb 2009 06:53:05 -0500 (EST)
- References: <7436629.1234686646764.JavaMail.root@m02>
b = Sequence[1, 2];
Length[Unevaluated@{b, 3}]
2
David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/
From: Nikolaus Rath [mailto:Nikolaus at rath.org]
Hello,
How can I get the length of a list in a Hold[] expression? I.e. if
b = Sequence[1,2];
then I want the length of {b,3} given as 2. But
Length[{b,3}]
gives me the length after splicing in b (which is 4), while
Length[Hold[{b,3}]]
gives me the length of the hold expression (which is 1).
Anyone able to help?
Best,
-Nikolaus
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