title: data points transformation to be used by DFT
body: <p>rather simple question for those who deeply understand Fourier Transform:
  so suppose that I have a data series of values [5,2,4,1,0,6,3,7]
  and I want to calculate Discrete Fourier Transform (DFT) for given set of data points.
  According to wiki DFT uses as input complex numbers and outputs also complex numbers, so question is how to convert / transform data points -&gt; input for DFT ?</p>