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Re: Sphere through 4 points

• To: mathgroup at smc.vnet.net
• Subject: [mg85419] Re: Sphere through 4 points
• From: Ray Koopman <koopman at sfu.ca>
• Date: Sun, 10 Feb 2008 05:12:08 -0500 (EST)
• References: <fojrcq$gme$1@smc.vnet.net>

On Feb 9, 1:22 am, Steve Gray <stev... at roadrunner.com> wrote:
>         Given 4 points in 3-space not lying in a plane, I want the
> center and radius of the incident sphere. I know about the elegant
> determinant solution (4 or 5 determinants, each 4x4, plus a few
> arithmetic operations) and I'm using that, but maybe someone has coded
> a faster version.
>         Thanks for any information.
>
> Steve Gray

See Dan Lichtblau's code at
http://forums.wolfram.com/mathgroup/archive/2003/Jan/msg00019.html