title: FFT on EEG signal in Android understanding the code
body: <p>I've been attempting to find a library that would enable to perform FFT (Fast Fourier Transform) on some EEG signals in Android. </p>
  
  <p>with help of Geobits, I've finally found the <a href="https://stackoverflow.com/questions/9272232/fft-library-in-android-sdk">code</a> that might help me do FFT on an EEG signal. But I am having a hard time figuring out how does the code actually work. I want to know what float array x and y are for and maybe an example that might help me a little more.</p>