natural

Natural ordering of the points of this rank-1 lattice

Specification

• Alias: None

• Arguments: None

Description

Returns the points in natural order.

Usage Tips

When the natural ordering of the points is used, it is implicitly assumed that the user will only request a number of points that is a power of 2. Failing to do so will result in a set of points for which one or more dimensions are not uniformly covered, resulting in bad low-discrepancy properties, and ultimately bad performance of the method that uses these points. It is recommended to not use this option unless you know what you’re doing.

Examples

environment
  tabular_data
    tabular_data_file = 'samples.dat'
    freeform

method
  sampling
    samples 8
    sample_type
      low_discrepancy
        rank_1_lattice
          generating_vector inline 1 5 # this is a Fibonacci lattice
          m_max 3 # 8 points in total
          no_random_shift
          ordering natural # this is fine since we generate 2^3 = 8 samples

variables
  uniform_uncertain = 2
    lower_bounds 0.0 0.0
    upper_bounds 1.0 1.0

interface
  analysis_drivers = 'genz'
  analysis_components = 'cp1'
  direct

responses
  response_functions = 1
  no_gradients
  no_hessians