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MathGroup Archive 1998

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RE: Variables names

  • To: mathgroup at smc.vnet.net
  • Subject: [mg15038] RE: [mg15002] Variables names
  • From: "Greg Arnold" <garnold at mbvlab.wpafb.af.mil>
  • Date: Wed, 9 Dec 1998 04:12:23 -0500
  • In-reply-to: <199812050630.BAA04464@smc.vnet.net.>
  • Sender: owner-wri-mathgroup at wolfram.com

ToExpression[ "x" <> ToString[i] ]

-----Original Message-----
From: Kim Allemand [mailto:kim.allemand at epfl.ch] To:
mathgroup at smc.vnet.net
Subject: [mg15038] [mg15002] Variables names


Hi,
I have a square matrix Q of dimension N and would like to generate the
quadratic function $\sum_{i,j}q_{ij}x_i x_j$. The problem is how to say
to Mathamatica that the variables names are x1, x2, etc. Is it possible
to generate variables names in an automatic way? A possibility would be
to generate manually a vector NN={x1, x2, x3, ....} of dimension N and
then to pick NN[[i]] for the ith variable name, but imagine when
N=1000... !!
Thanks, Kim



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