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MathGroup Archive 2010

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discussions on the language: For and Which

  • To: mathgroup at smc.vnet.net
  • Subject: [mg111561] discussions on the language: For and Which
  • From: Li Zhengji <zhengji.li at gmail.com>
  • Date: Thu, 5 Aug 2010 07:00:23 -0400 (EDT)

Hi all,

1. Attributes of For are {HoldAll, Protected}.

But I think HoldRest is just OK for For, because the first argument
"start" is evaluated once in every For.

2. Which takes even number of arguments

If we want a "default" branch in Which, we need to set the last 2
argument to "True, XXX".

Obviously, Which can be extended this without any problem: allow odd
number of arguments, and the last argument is treated as the "default"
branch.

-- 
Best Regards,
Li Zhengji


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