README
poly-mult-fft
Multiplies two polynomials together using an FFT.
Example
Real polynomial
Compute (1 + 2*x) * (1 + x^2)
:
var mult = require("poly-mult-fft")
console.log(mult([1, 2], [1, 0, 1]))
Output
[1, 2, 1, 2]
Complex polynomial
Compute (i + (1+3i)*x) * (2 + 5i * x^2)
:
var mult = require("poly-mult-fft")
console.log(mult( [[0, 1], [1, 3]],
[[2, 0, 0], [0, 0, 5]] ))
Output
[[0, 2, 5, 15],
[2, 6, 0, 5]]
Install
Install using npm:
npm install poly-mult-fft
API
require("poly-mult-fft")(a, b)
Multiplies two polynomials together.
a
is the first polynomialb
is the second polynomial
Supports both real and complex valued polynomials. To handle complex data, you should pass in a pair of coefficients
Returns: The product of the two polynomials
Time Complexity: O((a.length + b.length) * log(a.length + b.length))
License
(c) 2013 Mikola Lysenko. MIT License