shotnoise_process

         return a Standard Shot Noise model evenly time series
            s(t) = SUM_{i} h(t-t(i)) where h(t) = exp(-t/tau)*U(t)
            with U(t) = {0 for t let than 0,h0 for t great equal 0}

         timing tools

         shotnoise_process,time,rate,relaxation=relaxation,shotn=shotn

         time : time array of evenly binned lightcurve

         none

         relaxation : parameter value of the Shot Noise  process ;
                      relaxation time of the shot in bins
         shotn      : maximal number of shots in the light curve
         shoth      : mean shot height (if not set, equal 1.0)
         schlittgen : if set, return theoretical spectrum in
                      Schlittgen normalization (Schlittgen, H.J.,
                      Streitberg, B., 1995, Zeitreihenanalyse, R. Oldenbourg)
         leahy      : if set, return theoretical spectrum in Leahy
                      normalization (Leahy et al. 1983, Ap.J. 266, 160)
         miyamoto   : if set, return theoretical spectrum in Miyamoto
                      normalization (Miyamoto et al. 1992, Ap.J. 391, L21)

         rate       : count rate array of the Shot Noise lightcurve

         freq       : fourier frequency sample (in Hz)
         spectrun   : theoretical density spectrum to each frequency
         var        : theoretical variance of the process
         acf        : theoretical autocorrelation values to each time lag
         lag        : time-lag sample

         none

         none

         none

         uses the idl-randomn function

         shotnoise_process,time,rate,relaxation=50.,shotn=10

         Version 1.0, 1999.01.12, Sara Benlloch (IAAT)
                                 (benlloch@astro.uni-tuebingen.de)

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