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MathGroup Archive 1997

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Re: Sequence is funny !

  • To: mathgroup at smc.vnet.net
  • Subject: [mg8918] Re: [mg8852] Sequence is funny !
  • From: seanross at worldnet.att.net
  • Date: Thu, 2 Oct 1997 22:57:14 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Gilles BARBIER wrote:
> 
>      For some people who like to understand the internal mechanism
>      of Mathematica, I give them this little problem a friend sent to me :
> 
>      Why Table[i,{i,Sequence[1,3]}] gives {1,2,3,4} instead of {1,2,3} !!
> 
>      That's not a bug, I even have an explanation,if you are interested.
> 
>      Hope it's fun,
> 
>      Gilles.

I have no explanation, but I will throw some more information into the
pot.

Table[i,{i,Sequence[1,n]}] returns {1,2,3...,n+1}
Table[i,{i,1,n}]           returns  {1,2,3,...n}
Table[i,{i,Sequence[0,n]}] returns {1,2,3,...n}
Table[i,{i,0,n}]           returns {0,1,2,3...n}

Since Sequence is advertised as:

"Sequence[expr1, expr2, ... ] represents a sequence of arguments to be
spliced automatically into any function."

The above behavior IS a bug in my opinion regardless of how you can
explain it with internal structure etc.  The command does not do as
advertised=> a bug.


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