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*From*: Ludwik Kowalski <KowalskiL@MAIL.MONTCLAIR.EDU>*Date*: Wed, 7 Feb 2001 00:27:46 -0500

I should have added, in the message about John's Excel

project, that the infinity (place where V is forced to be

zero) is too close. Suppose the disk diameter is 15 cells.

to simulate a disk in empty space the matrix should be

at least 300 by 300 cells, or more. Or 3000 by 3000

if the disk diameter is 150 cells. That would slow the

program a lot but who cares? Let the computer run for

hours, save the matrix and play with it later to get the

S(r) distribution. Right?

Ludwik Kowalski

Bob Sciamanda wrote:

I once used this averaging algorithm to solve a boundary value Laplace

problem with MATHCAD. It is tedious to set up (stick to a simple geometry)

and very tedious in lengthy computing time. But the advantage is that

MathCad immediately gives you very enlightening graphs of the results: x vs

y plots, contour maps, little E field arrows or even perspective drawings of

the potential.

Anyone interested (it needs MathCad 6 Plus or better) can get my code by

asking. It takes some slight "trickery" to get MathCad to iterate.

Bob

Bob Sciamanda (W3NLV)

Physics, Edinboro Univ of PA (em)

trebor@velocity.net

www.velocity.net/~trebor

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