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

MathGroup Archive 2010

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

Search the Archive

Sphere formula

  • To: mathgroup at smc.vnet.net
  • Subject: [mg109432] Sphere formula
  • From: "S. B. Gray" <stevebg at ROADRUNNER.COM>
  • Date: Tue, 27 Apr 2010 04:05:16 -0400 (EDT)
  • Reply-to: stevebg at ROADRUNNER.COM

1. The center of a sphere through 4 points has a very nice determinant 
form. (http://mathworld.wolfram.com/Sphere.html) What I want is a nice 
formula for the center of a sphere through 3 points, where the center is 
in the plane of the three points. I have a formula but it's a horrible 
mess of hundreds of lines, even after FullSimplify.

2. (Unlikely) Is there a way to get Mathematica to put a long formula into a 
matrix/determinant form if there is a nice one?

Any tips will be appreciated.

Steve Gray


  • Prev by Date: Matrix questions
  • Next by Date: 3D visulaisation of 3D matrix for a 3D CA
  • Previous by thread: Re: Matrix questions
  • Next by thread: Re: Sphere formula