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  • License MIT

Quadratic function coeffs by different ways.

Package Exports

  • get-parabola

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (get-parabola) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

get-parabola

This module was created for have ability to receive quadratic fit coeffs for the condition like a*x^2 + bx + c by different ways.

Install

$ yarn add get-parabola

Usage

import Coeffs from 'get-parabola';

// Or any separate method of the class if necessary:
import { by2Points } from 'get-parabola';

So, you can use methods below

by2Points

const coeffs = Coeffs.by2Points([
  { x: 1, y: 1 },
  { x: 2, y: 2 }
]);

console.log(coeffs);
// { k: 1,
//   b: 0 }

getLineBy2Points

const lineFn = Coeffs.getLineBy2Points([
  { x: 1, y: 1 },
  { x: 2, y: 2 },
]);

console.log(lineFn(5));
// 5

by3Points

// CASE 1:
const coeffs = Coeffs.by3Points({
  x1: 1, y1: 1,
  x2: 2, y2: 4,
  x3: 3, y3: 9,
});

// CASE 2: And argument could be an Array like [{ x, y }] (but 3 points!)
const coeffs2 = Coeffs.by3Points([
  { x: 1, y: 1 },
  { x: 2, y: 4 },
  { x: 3, y: 9 },
]);

console.log(coeffs);
console.log(coeffs2);
// { a: 1,
//   b: 0,
//   c: 0,
//   error: null }
// But error could be string as explanation, check !error before use result.

getLineBy3Points

const lineFn = Coeffs.getLineBy3Points([
  { x: 1, y: 1 },
  { x: 2, y: 4 },
  { x: 3, y: 9 },
]);

console.log(lineFn(5));
// 25

byLeastSquaresApproximation

const coeffs = Coeffs.byLeastSquaresApproximation([
  { x: 4, y: 4 },
  { x: 5, y: 5 },
  { x: 6, y: 6 },
  { x: 10, y: 7 },
  { x: 12, y: 8 },
  { x: 15, y: 9 },
]);

console.log(coeffs);
// { a: -0.015889095754389806,
//   b: 0.7155842733545066,
//   c: 1.744177344577082 }

getLineByLeastSquaresApproximation

const lineFn = Coeffs.getLineByLeastSquaresApproximation([
  { x: 4, y: 4 },
  { x: 5, y: 5 },
  { x: 6, y: 6 },
  { x: 10, y: 7 },
  { x: 12, y: 8 },
  { x: 15, y: 9 },
]);

console.log(lineFn(5));
// 4.92487131748987

getBrokenLineByPoints

const lineFn = Coeffs.getBrokenLineByPoints([
  { x: 4, y: 4 },
  { x: 5, y: 5 },
  { x: 6, y: 6 },
  { x: 10, y: 7 },
  { x: 12, y: 8 },
  { x: 15, y: 9 },
]);

console.log(lineFn(24));
// 12
// This function gives result in lines between your points or interpolate in
// external cases

Commands

  • npm run clean - Remove lib/ directory
  • npm test - Run tests with linting and coverage results.
  • npm test:only - Run tests without linting or coverage.
  • npm test:watch - You can even re-run tests on file changes!
  • npm test:prod - Run tests with minified code.
  • npm run test:examples - Test written examples on pure JS for better understanding module usage.
  • npm run lint - Run ESlint with airbnb-config
  • npm run cover - Get coverage report for your code.
  • npm run build - Babel will transpile ES6 => ES5 and minify the code.
  • npm run prepublish - Hook for npm. Do all the checks before publishing your module.

License

MIT © Den Pol