ndarray-fft

ndarray-fft ===========

A fast Fourier transform implementation for ndarrays. You can use this to do image processing operations on big, higher dimensional typed arrays in JavaScript.

Example

```javascript var zeros = require("zeros") var ops = require("ndarray-ops") var fft = require("ndarray-fft") var x = ops.random(zeros(256, 256)) , y = ops.random(zeros(256, 256)) //Forward transform x/y fft(1, x, y) //Invert transform fft(-1, x, y) ```

Install

Via npm:

npm install ndarray-fft

require("ndarray-fft")(dir, x, y)

Executes a fast Fourier transform on the complex valued array x/y.

• dir - Either +/- 1. Determines whether to use a forward or inverse FFT

• x the real part of the signal, encoded as an ndarray

• y the imaginary part of the signal, encoded as an ndarray

x and y are transformed in place. Note This code is fastest when the components of the shapes arrays are all powers of two. For non-power of two shapes, Bluestein's fft is used which is somewhat slower. Note2 The inverse FFT is scaled by 1/N, forward FFT is unnormalized. (c) 2013 Mikola Lysenko. MIT License. Radix 2 FFT based on code by Paul Bourke.