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MathGroup Archive 1998

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Re: Vectors (other problem)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13931] Re: Vectors (other problem)
  • From: Harald Giese <giese at dkrz.de>
  • Date: Tue, 8 Sep 1998 02:52:30 -0400
  • Organization: Institut fuer Meereskunde, Universitaet Hamburg
  • References: <6ssun9$m7p@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Olivier Georg wrote:
> ...
> This time, I have a vector I name A, and I would like to name its
> components A_0 (i.e. {Subscript[A, 0]), A_1 and A_2:
> 
>       / A_0 \
>   A = | A_1 |
>       \ A_2 /
> 
> but I get:
> 
> $RecursionLimit::"reclim": "Recursion depth of \!\(256\) exceeded."
> ...


Oliver,

The Mathematica Help Browser would tell you, that "_ or Blank[ ] is a
pattern object that can stand for any Mathematica expression. ..." It
is not the sign for subscripts. 

Have a look at "Add-ons" -> "Extra Utilities" -> "Notation" (also in the
online help) instead. It should be possible to link the Expression
SubscriptBox["A", "0"] to A[[1]] an so on. Please note: A[[0]] is the
head of expression A (in this case "List").

-Harald

-- 
Harald Giese
Email: giese at dkrz.de
Phone: +49 (0)40 4123 5796; Fax: +49 (0)40 5605724 Institut fuer
Meereskunde der Universitaet Hamburg (Institute of Oceanography of the
University of Hamburg) Troplowitzstrasse 7, D-22529 Hamburg


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