title: computing fft of damped waves
body: <p>I have a time series which is a linear combination of damped waves. The data is real.</p>
  
  <p>Y(t) =SUM_w exp(- gamma t) sin(omega t)</p>
  
  <p>There is no analytic form but this is a closest guess. I want to fourier analyze (FFT) such data and get the real frequencies and damping rates.</p>
  
  <p>I am using matlab but any tool would be fine
  Thanks!</p>