natural

Natural ordering of the points of this digital net

Specification

• Alias: None

• Arguments: None

Description

Returns the points in natural order.

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 32
    sample_type
      low_discrepancy
        digital_net
          generating_matrices inline
            1 2 4 8 16
            # this encodes the generating matrix
            # 1 0 0 0 0
            # 0 1 0 0 0
            # 0 0 1 0 0
            # 0 0 0 1 0
            # 0 0 0 0 1
            1 3 5 15 17
            # this encodes the generating matrix
            # 1 1 1 1 1
            # 0 1 0 1 0
            # 0 0 1 1 0
            # 0 0 0 1 0
            # 0 0 0 0 1
          m_max 5
          t_max 5
          no_scrambling
          no_digital_shift
          ordering natural # this is fine since we generate 2^5 = 32 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