Package Exports
- horner
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Readme
horner
Evaluates polynomials using Horner's rule.
Use
First install via npm:
npm install hornerThen you can use it as follows:
var horner = require("horner")
//Example: Evaluate the polynomial 1 + 2 * x^2 at x = 2
console.log(horner([1, 0, 2], 2.0))
//Prints: 9
//Example: Evaluate a complex polynomial
//
// 2 - 3i * x + (4 + 5i)*x^2
//
// At x = 1+2i
console.log(horner([[2, 0, 4] //Real coefficients
, [0, -3, 5]] //Imaginary coefficients
, [1, 2]))
//Prints: [-24,-2]require("horner")(poly, z)
Evaluates the polynomial at the point z
polyis the coefficients of the polynomial arranged in increasing degree. If complex, is a pair of arrays, the first representing the real coefficients and the second representing the imaginary coefficients.zis the point to evaluate the polynomial at. Either a scalar for a real valued function or a pair for a complex number.
Returns: A scalar for real results, a pair for complex results
Time Complexity: O(poly.length)
Credits
(c) 2013 Mikola Lysenko. MIT License