DFT[1, 2, 3], DFT[1, 2, 3, 0], DFT[1, 2, 3, 1], DFT[1, 2, 3, 1, 2, 3, 1, 2]

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.