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 GetQuadraticFitCoefficients from 'get-parabola';

// Or any separate method of the class if necessary:
import { by3Points } from 'get-parabola';

So, you can use methods below

• by3Points
• byLeastSquaresApproximation
• Others in process...

by3Points

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

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

byLeastSquaresApproximation

const coeffs = GetQuadraticFitCoefficients.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,
// }

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