Re: Feature Request: Left (and Right) inverse of the Cross Product

Robert Kern via NumPy-Discussion <[email protected]>
Newsgroups gmane.comp.python.numeric.general
Message-ID <CAF6FJitTqmoD314g4ESJH-JRqBz+upoBiDZJrJsKBqvfCaRfqA@mail.gmail.com> 
On Mon, Jun 2, 2025 at 1:09 PM Oscar Benjamin via NumPy-Discussion <
[email protected]> wrote:

> In vectors the minimum norm solution for b in a x b = c is just bhat =
> (c x a) / |a|^2 so the cross product computes its own "inverse":
>
> In [135]: np.cross(c, a) / (a**2).sum()
> Out[135]: array([-0.93244529,  0.74775365,  1.09117371])
>

Delightful!

-- 
Robert Kern

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