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MathGroup Archive 2000

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Limitation of ListCorrelate?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24811] Limitation of ListCorrelate?
  • From: "D. Orr" <nonlnr at yahoo.com>
  • Date: Sun, 13 Aug 2000 03:16:50 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Does anyone know how to get ListCorrelate to work with
a *variable* kernel?  It seems that ListCorrelate
would be a very efficient way to code finite
difference schemes for solving PDE's.  However, at the
edge of the computational domain, one would often like
to implement "dummy points" which effectively change
the stencil or kernel.  ListCorrelate does allow for
"arbitrary" overhangs at the edges of a list, but the
overhangs must be elements of the original kernel - so
they are not arbitrary at all.  In general, the finite
difference kernel at the edges will not be equal to
any of the elements of the interior kernel.  I hope
I'm missing something here, otherwise this would
appear to be a very severe limitation of
ListCorrelate.

Regards,

D. J.

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