MathGroup Archive 1997

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  • Subject: [mg8642] two-way lists
  • From: sch at (Stu Schaffner)
  • Date: Fri, 12 Sep 1997 04:10:55 -0400
  • Organization: The MITRE Corp.
  • Sender: owner-wri-mathgroup at

While working with wavelets and signal processing algorithms, I have often
had to consider sequences where the index set is all of the integers, not
just the positive integers.  Sometimes these sequences are symmetric or
antisymmetric, sometimes not.  Sometimes the support is a small range of
indices, sometimes the support is scattered. Other cases will
arise, I am certain, in the future.

In order to avoid building too many specific implementation forms into
programs that use these sequences, I built a package to support "centered
sequences" as an abstract data type.  This package just grew over the past
year or two as I added features I needed.  Now it is big enough to warrant
a second look. I could just let it continue to grow as needed, without
spending much time on it.  Alternatively, if anybody has a better package or
even a better approach to the problem, perhaps I should replace mine with

Does anybody have a better alternative?  If not, would anybody be interested
in having me clean it up and post it to MathSource?

Stu Schaffner,
not doing any of this for The MITRE Corp.
stusch at

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