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Re: Mathematica's nesting.

• To: mathgroup at smc.vnet.net
• Subject: [mg12670] Re: Mathematica's nesting.
• From: "Allan Hayes" <hay at haystack.demon.cc.uk>
• Date: Mon, 1 Jun 1998 23:16:44 -0400
• References: <6kpvhd$sjb@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Luis Fernando Medina wrote in message <6kpvhd$sjb at smc.vnet.net>...
>
>This is a small but VERY annoying problem I'm having in an otherwise
>extremely simple program in Mathematica for Students. My program
>contains two nested Do[] clauses and ordinarily runs smoothly without
>any complain. But, recently I've been trying to write an auxilary
>program based on this. Turns out that absolutely innocuous changes
>inside the Do clauses in the program are enough for it to stop running.
>At the beginning I thought I was being careless with the syntax and so
>began trying each time dumber instructions. In my last attempt, I just
>typed within one of the Do clauses Print["p"];, that is, just another
>instruction more in the already long string of instructions it
>ordinarily performs without any complaint. I've been careful enough to
>write down the semicolons in their right place (after all, there aren't
>many mistakes you can do with such an instruction). Much to my
>surprise, this minute change is enough for Mathematica to say that my
>program is missing a closing ] in the Do clause. Of course, this is
>accompanied by the "oh-so-helpful!" error message where ALL the program
>is underlined in red (as if this could hint you of the possible error
>in a program several scrolls long). To make things worse, the problem
>persists AFTER I erase the new instruction down to the last character.
>Once this happens, not even closing the window and opening it again
>will work. As far as Mathematica is concerned, the program has been
>tainted by the "original sin" and no amount of repentance can redeem
>it. Can somebody explain me what on earth is going on here? As usual,
>to avoid overload of the Internet, just answer to my email:
>lmedina at leland.stanford.edu
>
>Thanks a lot!
>
>
>Luis Fernando Medina
>lmedina at leland.stanford.edu
>
>


Luis,

Please post the example.

Meanwhile:

> the problem persists AFTER I erase the new instruction down to the last
> character.

Clear["`*"]

will clear your own definitions.

Menu > Kernel > Quit Kernel > Local

will do a more thorough job.

------------------------------------------------------------- 
Allan Hayes
Training and Consulting
Leicester UK
http://www.haystack.demon.co.uk
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