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MathGroup Archive 2009

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How to remove all cycles

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98269] How to remove all cycles
  • From: buts <manger31 at yahoo.com>
  • Date: Sun, 5 Apr 2009 06:32:16 -0400 (EDT)

Hello, 
I want to write the following code using functional
programming, i.e. to remove all Do's.
There are two arrays: 

A[[i]], i=1,...,2^(n+1)
B[[j,k]], j=1,2;  k=1,...,2^n.

I need to assign B to A setting the first bit of the index i
to be the index j. Explicitly

Do[Do[A[[ j + BitShiftLeft[k-1,1] ]]= B[[j,k]],
{j,1,2}],{k,1,2^n}]

I need to do it for multi-dimensional large arrays.
Is it possible to write it without Do's ?

Thanks.


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