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MathGroup Archive 2005

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Re: Function to handle array with variable _number_ of dimensions?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58530] Re: [mg58509] Function to handle array with variable _number_ of dimensions?
  • From: Sseziwa Mukasa <mukasa at jeol.com>
  • Date: Wed, 6 Jul 2005 03:11:15 -0400 (EDT)
  • References: <200507050557.BAA29447@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On Jul 5, 2005, at 1:57 AM, Joe Christy wrote:

> I'd like to write a function that takes two integer arguments, P and Q
> say, and then returns a value calculated from the P x P x ... x P (Q
> factors) array, whose entries depend on both P and Q. My first impulse
> is to try and iterate over the array, but I don't see how to  
> generate a
>  non-fixed number of iteration variables.
>
> Does anyone have a suggestion of a good way to do this, short of  
> writing
> a a distinct variant function for each possible value of Q?

Your question is unclear, do you have a Q dimensional array that you  
are extracting elements from, or a 1 dimensional array that you are  
extracting the P^Qth element from?  Incidentally you probably should  
use lower case variables.

If it's the first case just use Table

arr[[Sequence@@Table[p,{q}]]]

will extract the element p,p,...p repeated q times of arr.

Regards,

Ssezi


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