RosettaCodeData/Task/Fast-Fourier-transform/J/fast-fourier-transform-2.j

   (**+)&.+. (,: fft) 1 o. 2p1*3r16 * i.16
0 0.92388 0.707107 0.382683 1 0.382683 0.707107 0.92388 0 0.92388 0.707107 0.382683 1 0.382683 0.707107 0.92388
0       0        0      0j8 0        0        0       0 0       0        0        0 0      0j8        0       0