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Re: how to determine the center or foci of an ellipse from a slope

• To: mathgroup at smc.vnet.net
• Subject: [mg88972] Re: how to determine the center or foci of an ellipse from a slope
• From: Szabolcs <szhorvat at gmail.com>
• Date: Thu, 22 May 2008 02:39:59 -0400 (EDT)
• References: <g11r0s$a87$1@smc.vnet.net>

On May 21, 8:52 pm, John Kellerham <johnkeller... at yahoo.com> wrote:
> Hi guys,
> I have a slope field (2d-array), which is defined
> by ellipses (can be arbitrarily tilted), which all have the
> same foci and center but different major and minor half axes.
> In fact, I obtained the tangent at each point by measurements.
>
> Does somebody have an idea on how to approach the problem
> of finding the center or the foci of the ellipses? I think
> there is no exact solution to the problem?
>

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