Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2008

[Date Index] [Thread Index] [Author Index]

Search the Archive

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg88907] how to determine the center or foci of an ellipse from a slope
  • From: John Kellerham <johnkellerham at yahoo.com>
  • Date: Wed, 21 May 2008 14:48:32 -0400 (EDT)

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?

Best Regards,
Thomas


  • Prev by Date: Re: Problems with ListPlot
  • Next by Date: change a system of PDEs to ODEs via traveling wave
  • Previous by thread: Re: Re: Cannot NSolve a system of equations
  • Next by thread: Re: how to determine the center or foci of an ellipse from a slope