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MathGroup Archive 2001

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subscripted variables in Modules

  • To: mathgroup at smc.vnet.net
  • Subject: [mg30106] subscripted variables in Modules
  • From: "Arny" <someone at somewhere.sometime>
  • Date: Sat, 28 Jul 2001 01:51:06 -0400 (EDT)
  • Organization: University of California, Riverside
  • Sender: owner-wri-mathgroup at wolfram.com

Hello All,

(After some effort) I have gotten a proggy with subscripted variables to do
what I want and have come to appreciate the utility of Mathematica's
decision to not declare subscripted variables as variables but as
expressions, i.e.

In: FullForm[X_i]
Out: SubScript[X,i]

The value being that one can create formulas with subscripted variables,
then apply replacement rules that automatically handle the iterators, i.e.:

In: Sum[X_i , {i,n} ] /. {n->Length[data], X_i -> data[[i]]}
Out:data[[1]] + data[[2]] + data[[3]] + ... etc ...+ data[[Length[data]]]

Ok, no problem.  However when I do my algorithm inside of a Module[] I am
not able to declare X_i as a local variable because it isn't a variable, it
is an expression.  So long as I am not using X_i's elsewheres this is no
problem, but of course I would like to protect everything and would like to
do so.

Any suggestions????

B
--
Bernard Gress
Department of Economics
University of California, Riverside
1150 University Ave.
Riverside, CA 92521-0247
Fax: (909) 787-5685
Phone: (909) 778 9813
BGRESS at MAIL.UCR.EDU
http://csep.ucr.edu/staff/bernard/index.htm




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