ndarray-fft

FFT for ndarrays

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ndarray-fft =========== Build Status
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.
Credits
(c) 2013 Mikola Lysenko. MIT License. Radix 2 FFT based on code by Paul Bourke.