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Re: Strange phenomenon

• To: mathgroup at smc.vnet.net
• Subject: [mg32140] Re: Strange phenomenon
• From: "Steve Gray" <stevebg at adelphia.net>
• Date: Sat, 29 Dec 2001 03:57:29 -0500 (EST)
• References: <a0jlqg$31i$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

"Steve Gray" <stevebg at adelphia.net> wrote in message
news:a0jlqg$31i$1 at smc.vnet.net...
>     I do a calculation involving the product of four 5x5 matrices
containing
> a bunch of E^(2PiI/5) type terms, and get an answer containing
> stuff like the following (I did Copy As > Plain Text)
>
> \!\(\(\(\(\(\(+2\)\ zr\^4 - \((\(-1\))\)\^\(3/5\)\ \((1 +
>               List - \((5 + List)\)\ zr +
>               7\ zr\^2 + \((\(-6\) + List)\)\ zr\^3 +
>               zr\^4)\) + \((\(-1\))\)\^\(1/5\)\ \((\(-2\) +
>               List\ \((1 + zr + 2\ zr\^2)\) -
>               zr\ \((\(-3\) +
>                     zr\ \((7 + \((\(-4\) +
>                                 zr)\)\ zr)\))\))\) +
\((\(-1\))\)\^\(2/5\)\
> \
>
>     It looks like Mathematica thinks "List" is a variable.

    I just found that this is what happens when you have an error
in the list relative address, specifically when you do mylist[[0]] by
mistake.
    This is not a good method of notification of that error.