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Re: Sphere through 4 points

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  • Subject: [mg85419] Re: Sphere through 4 points
  • From: Ray Koopman <koopman at>
  • Date: Sun, 10 Feb 2008 05:12:08 -0500 (EST)
  • References: <fojrcq$gme$>

On Feb 9, 1:22 am, Steve Gray <stev... at> 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

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