muratakcs / clj-cayley-dickson

A Cayley-Dickson construction for hypercomplex algebras in Clojure

clj-cayley-dickson

Cayley-Dickson construction for generating hypercomplex algebras in Clojure.

https://en.wikipedia.org/wiki/Cayley%E2%80%93Dickson_construction

Usage

Here's an example of using clj-cayley-dickson to demonstrate that the quaternions are associative for some fixed values:

(is
  (= (times
       (quaternion {:a 1 :b 2 :c 3 :d 4})
       (times (quaternion {:a 8 :b 7 :c 6 :d 5})
              (quaternion {:a 9 :b 10 :c 11 :d 12})))
     (times
       (times
         (quaternion {:a 1 :b 2 :c 3 :d 4})
         (quaternion {:a 8 :b 7 :c 6 :d 5}))
       (quaternion {:a 9 :b 10 :c 11 :d 12}))))

In addition to times there is also plus, minus, neg, and c (conjugate).

Or, you can use operations on the algebras like scale, norm, inv, or mag like so:

(is 
  (= (quaternion {:a 1.5 :b 1.5 :c 1.5 :d 1.5})
     (scale 
       (quaternion {:a 1 :b 1 :c 1 :d 1})
       1.5)))

In addition to quaternion, this library also provides built-in support to construct complex, octonion, and sedenion algebras, with easy extensibility for higher order algebras.

Tests

lein test

License

Credits to:

• https://github.com/hamiltron/py-cayleydickson (MIT License)
• https://nakkaya.com/2009/09/29/fractals-in-clojure-mandelbrot-fractal/
• https://github.com/clojure-numerics/image-matrix/blob/master/src/main/clojure/mikera/image_matrix/colours.clj (EPL License)

Copyright © 2018 FIXME

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.