STK_EXAMPLE_DOE02  "Sequential Maximin" design

 In this example, a two-dimensional space-filling design is progressively
 enriched with new points using a "sequential maximin" approach. More
 precisely, the k-th point X(k, :) is selected to maximize the distance to the
 set of all previously selected points X(1, :), X(2, :), ..., X(k-1, :).

 NOTES:

  * The resulting design is NOT optimal with respect to the maximin criterion
    (separation distance).

  * This procedure is not truly a *sequential* design procedure, since the
    choice of the k-th point X(k, :) does NOT depend on the response at the
    previously selected locations X(i, :), i < k.

 REFERENCE

  [1] Emmanuel Vazquez and Julien Bect, "Sequential search based on kriging:
      convergence analysis of some algorithms", In: ISI - 58th World
      Statistics Congress of the International Statistical Institute (ISI'11),
      Dublin, Ireland, August 21-26, 2011.