### Power spectrum of inter-event intervals

`spikespec [-F# -## -w# -i -o` outfile`-l# -x# -c# -V# -h]` file(s)

> `-F` maximal frequency (2*l / total time)
> `-#` number of frequencies (F* total time /2)
> `-w` frequency resolution (0)
> `-i` expect intervals rather than times
> `-l` number of values to be read (all)
> `-x` number of values to be skipped (0)
> `-c` column to be read (1 or file,#)
> `-o` output file name, just `-o` means file`_sp`
> `-V` verbosity level (0 = only fatal errors)
> `-h` show this message

Computes a power spectrum assuming that the data are the times of singular events, e.g. heart beats. With the flag `-i` set, the data is taken to be inter-event intervals rather than event times. If the event times are t(n), n=1,...,l, the spectrum is defined by

                l                    2
             | --- 	                |
             | \     -i 2 pi f t(n) |
      S(f) = |  |  e	        |
       	 | /   	                |
             | --- 	                |
               n=1

that is, the signal is taken to be a sum of delta functions at the t(n). S(f) is computed for `#` frequencies between 0 and `-F` . The result is binned down to a frequency resolution `-w` . Output file file_ss (frequency, spectrum).

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