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    Re: Location Center of Responses thus Far
    From: Bill Murdoch
    Date: 2001 Jul 23, 7:45 PM

    In a message dated 7/23/01 9:05:58 PM Eastern Daylight Time,
    glendonJLM@BIGPOND.COM writes:
    > Its an optimisation problem isn't it?
    > Let x be the unknown location centre
    > Let D(i) be the great circle distance between the i th member and x
    > Then we want to choose x such as to:
    > minimise{sum of [ D(i); i=1-n]}
    > or, minimise{sumof[ square of D(i): i=1-n]}
    > subject to x lying between lat and lon of 0-360
    > hmmm, shipping or airline companies must have tackled this one??
    Sounds military to me.  Where should I park my guided missile submarine so
    that the average time of flight to my targets is a minimum ?
    Bill Murdoch

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