title: Apple's Accelerate vDSP : How to get the argument of complex vector from FFT
body: <p>vDSP allows computing the result of the Discrete Fourier Transform as a complex vector.</p>
  
  <p>The function <code>vDSP_zvmags</code> provides the squared norm of the complex vector. How can I compute the argument (or should I do it myself by hand)?</p>