From: ruby-core@...
Date: 2014-10-29T02:52:51+00:00
Subject: [ruby-core:65969] [ruby-trunk - Feature #10074] [PATCH] generalize	Vector#cross_product

Issue #10074 has been updated by Marc-Andre Lafortune.


I committed this change, with a couple of changes.

In particular, the sign was wrong for even dimensions. I changed it so we now have, for any `n`:

    first, *middle, last = Matrix.identity(n).column_vectors
    first.cross(*middle) == last

Thanks for this feature request!

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Feature #10074: [PATCH] generalize Vector#cross_product
https://bugs.ruby-lang.org/issues/10074#change-49704

* Author: gogo tanaka
* Status: Assigned
* Priority: Normal
* Assignee: Marc-Andre Lafortune
* Category: lib
* Target version: current: 2.2.0
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Usually We use cross_product in only 3 dimensions.

Sometimes we want to handle cross_product in n-dimensions.

But I recognize Ruby should be not for mathematician but rubyist.

Ruby doesn't need too academic method.

So If you think it is too academic you can ignore my patches.

---Files--------------------------------
generalize_Vector#cross_product.patch (1.71 KB)


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