https://github.com/mikolalysenko/cooriented

Checks relative orientation of cells
https://github.com/mikolalysenko/cooriented

Last synced: about 2 months ago
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Checks relative orientation of cells

• Host: GitHub
• URL: https://github.com/mikolalysenko/cooriented
• Owner: mikolalysenko
• Created: 2013-03-20T00:37:39.000Z (almost 12 years ago)
• Default Branch: master
• Last Pushed: 2013-03-21T19:10:55.000Z (almost 12 years ago)
• Last Synced: 2024-04-29T11:05:41.282Z (8 months ago)
• Language: JavaScript
• Size: 105 KB
• Stars: 4
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
cooriented

==========

Checks relative parity of two sequences.  Can be used to evaluate the differential in simplicial homology.

Usage

=====

Via npm:

    npm install cooriented

    

```javascript

console.log(require("cooriented")([0,1,2], [0,1,2])) // prints +1

console.log(require("cooriented")([0,1,2], [1,0,2])) // prints -1

```

`require("cooriented")(a, b)`

-----------------------------

Computes the relative orientation of a vs b.  This is done by evaluating the Vandermonde polynomials of degree n for a and b, then taking their quotient mod 3.  If:

* a.length !== b.length

* OR the elements in a and b do not match

* OR either a or b contains any repeated elements

Then this returns 0.

Credits

=======

(c) 2013 Mikola Lysenko.