The data points are from a single variable (usually 
x)
      starting from a random point on the attractor or in the chaotic
      sea so that you will get a different time series each time you run
      the program. For the continuous-time systems, 
h is the
      interval between data samples. The chaotic systems are from
      Appendix A of 
Chaos and Time-Series Analysis by J. C.
      Sprott (Oxford, 2003). See also my 
random number
        generator.