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MathGroup Archive 2000

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RE: Subscripted local variables in Module

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24028] RE: [mg24003] Subscripted local variables in Module
  • From: "David Park" <djmp at earthlink.net>
  • Date: Tue, 20 Jun 2000 03:07:40 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com


> -----Original Message-----
> From: skker [mailto:skker at skker.com]
To: mathgroup at smc.vnet.net

> Why can't I use subscripted local variables in a Module?
>
> Module[{x[1], x[2]},
>    x[1] = 1;
>    x[2] = 2;
>    x[1] + x[2]
>    ]
> doesn't work. I could fix this code by replacing x[1] by x and x[2] by
> y. But there is a more serious problem when I want a non-fixed number of
>
> local variables.
>

The first argument in a Module must be a list of symbols; x[1] is not a
symbol but an expression. It is easy enough:

Module[{x},
   x[1] = 1;
   x[2] = 2;
   x[1] + x[2]
   ]
3

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/



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