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MathGroup Archive 2006

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Re: product formula in mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68753] Re: product formula in mathematica
  • From: "Norbert Marxer" <marxer at mec.li>
  • Date: Fri, 18 Aug 2006 03:11:56 -0400 (EDT)
  • References: <ec19d4$oie$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hello

The iterator (i.e. the second argument of Product) has to be a standard
iterator. Therefore your input will not work.

But you can write your own product function, which does what you want.
If you define

   myProduct[f_, arr_] := Apply[Times, Thread[f[arr]]]

Then

   myProduct[Sin, {1, 3, 4, 9, 12}]

will give

   Sin[1] Sin[3] Sin[4] Sin[9] Sin[12]

Best Regards
Norbert Marxer
www.mec.li


frou wrote:
> Hi I am interested in doing a product over a set of indices that are
> not continuous
> Product [ f(x_i) , { x_i, 1,3,4,9}]     Is this possible it appears
> that the iterator wouldonly take sequences such as 1...10 etc.
> 
> Thanks


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