Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1998
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1998

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: nice Gotcha!

  • To: mathgroup at smc.vnet.net
  • Subject: [mg15050] Re: [mg15011] nice Gotcha!
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 9 Dec 1998 04:12:32 -0500
  • Organization: Universitaet Leipzig, Institut fuer Informatik
  • References: <199812050630.BAA04500@smc.vnet.net.>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Luc,

 as I can see Your test[] works as expected. Did You ever try


Clear[x];
test[] := Block[
      {x},

      ToExpression["x=3"];
      Print[x];
      ];
test[];
Print[x];


A

Block[{Active=False},
   ...
  ]

will help you also.

Regards
  Jens


"Barthelet, Luc" wrote:

> Code similar to the following gave me trouble today. I thought it would
> be fun to share:
>
> Clear[x];
> test[] := Module[
>       {x},
>
>       ToExpression["x=3"];
>       Print[x];
>       ];
> test[];
> Print[x];
>
> In my version. "x" was infact the variable "Active" which is an option
> to ButtonBox and created a ton of problems. Of course I could not
> change the name (user driven, and that's why I am running a
> ToExpression on it).
>
> The solution was to not declare Active in the Module and to
> Clear[Active] in the function.
>
> any other insight?
>
> Luc Barthelet
> GM the day, Mayor at night
> http://www.simcity.com



  • References:
  • Prev by Date: Re: Re: mathlink & MS Visual C++ 6.0
  • Next by Date: Re: Question on Nest[]
  • Previous by thread: Re: nice Gotcha!
  • Next by thread: Re: nice Gotcha!