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Re: a dangerous feature of Module[]?

• To: mathgroup at smc.vnet.net
• Subject: [mg57507] Re: a dangerous feature of Module[]?
• From: Scott Hemphill <hemphill at hemphills.net>
• Date: Tue, 31 May 2005 04:58:58 -0400 (EDT)
• References: <d76ol2$7si$1@smc.vnet.net> <d7dp1d$qag$1@smc.vnet.net>
• Reply-to: hemphill at alumni.caltech.edu
• Sender: owner-wri-mathgroup at wolfram.com

Gennady Stupakov <stupakov at yahoo.com> writes:

> Thanks to everybody who replied to my post.
> 
> Experts are aware of this feature of Module, and I was referred to a 
> recent discussion of a related issue in
> http://forums.wolfram.com/mathgroup/archive/2005/May/msg00112.html
> 
> I checked the description of scoping in Mathematica book (section 2.6) to 
> find out that most examples there use Set, rather then them SetDelayed, to 
> illustrate the mechanism of local variables in Module. The book totally 
> ignores all the subtleties of the scoping issues. That is frustrating -- 
> after more then 10 years programming in Mathematica I realised that many of my 
> codes might have serious bugs.

Note that Block[] behaves differently from Module[].

Scott
-- 
Scott Hemphill	hemphill at alumni.caltech.edu
"This isn't flying.  This is falling, with style."  -- Buzz Lightyear