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summation optimization

  • To: mathgroup at
  • Subject: [mg15326] summation optimization
  • From: "Arturas Acus" <acus at>
  • Date: Fri, 8 Jan 1999 04:15:16 -0500
  • Sender: owner-wri-mathgroup at


Suppose I wish to do multiple sums explicitly. Which one method is
preferable and how much time it can save?  What about memory usage?

Method 1:


Method 2:


Generally, how much grouping of similar indices  can be effective? 
                                      Arturas Acus
Institute of Theoretical
Physics and Astronomy
Gostauto 12, 2600,Vilnius

E-mail: acus at
   Fax: 370-2-225361
   Tel: 370-2-612906

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