STK_EXAMPLE_DOE01  Examples of two-dimensional designs

 All designs are constructed on the hyper-rectangle BOX = [0; 2] x [0; 4].

 Examples of the following designs are shown:
  a) Regular grid                         --> stk_sampling_regulargrid,
  b) "Maximin" latin hypercube sample     --> stk_sampling_maximinlhs,
  c) RR2-scrambled Halton sequence        --> stk_sampling_halton_rr2,
  d) Uniformly distributed random sample  --> stk_sampling_randunif.