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Re: Defining function with indexed variables

  • To: mathgroup at smc.vnet.net
  • Subject: [mg99339] Re: [mg99300] Defining function with indexed variables
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sun, 3 May 2009 05:21:33 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

Clear[f, x]

f[x__] := Module[{xl = Flatten[{x}]}, xl.xl]

f[Superscript[x, #] & /@ Range[3]] 

Superscript[x, 1]^2 + Superscript[x, 2]^2 + 
   Superscript[x, 3]^2

f[Superscript[x, #] & /@ Range[100]] == 
 f[Sequence @@ (Superscript[x, #] & /@ Range[100])]

True


Bob Hanlon

---- Paul Smith <phhs80 at gmail.com> wrote: 

=============
Dear All,

How can one define the function

f(x1,x2,...,x100) := x1^2 + x2^2 + ... + x100^2

using superscripts?

Thanks in advance,

Paul



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