StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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52 lines
1.5 KiB
52 lines
1.5 KiB
4 years ago
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robust-in-sphere
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================
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Exact arithmetic test to check if (n+2) points are cospherical.
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(Very) loosely inspired by [Jonathan Shewchuk's work on robust predicates](http://www.cs.cmu.edu/~quake/robust.html). Currently not as fast, but pull requests are welcome.
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[](https://ci.testling.com/mikolalysenko/robust-in-sphere)
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[](http://travis-ci.org/mikolalysenko/robust-in-sphere)
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# Example
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```javascript
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var inSphere = require("robust-in-sphere")
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console.log(inSphere(
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[0, 1],
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[1, 0],
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[-1, 0],
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[0, -1]))
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```
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# Install
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```
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npm install robust-in-sphere
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```
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# API
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```javascript
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var inSphere = require("robust-in-sphere")
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```
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### `inSphere(a,b,c,...)`
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Tests if a collection of `n+2` points in `n`-dimensional space are cospherical or if the last point is contained in the sphere or not.
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* `a,b,c,...` is a list of points
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**Returns** A signed integer that gives the orientation of the points
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* `<0` if the last point is contained in the oriented sphere defined by the previous two points
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* `>0` if the last point is outside the sphere
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* `0` is the points are cospherical
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**Notes** Up to 6 points it is possible to get a specialized version of `inSphere` that avoids an extra dispatch using the syntax:
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```javascript
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inSphere[4](a,b,c,d) === inSphere(a,b,c,d)
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```
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## Credits
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(c) 2014 Mikola Lysenko. MIT License
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