Dakota Reference Manual  Version 6.4
Large-Scale Engineering Optimization and Uncertainty Analysis
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step_vector


Size of step for each variable

Specification

Alias: none

Argument(s): REALLIST

Description

The step_vector keyword specifies how much each variable will be incremented in a single step.

step_vector works in conjunction with num_steps, which determines the number of steps taken during the vector_parameter_study. If instead of step_vector, final_point is specified with num_steps, Dakota will infer the step sizes.

Entries in the step_vector are the actual amounts by which continuous and range variables are incremented. For set variables, step_vector entries are interpreted as indexes into the underlying set.

Default Behavior

The user is required to specify either final_point or step_vector. There is no default definition for the vector.

Examples

variables
  continuous_design 1
    initial_point 1.0
    descriptors 'x1'
  discrete_design_set
    string 1
     elements 'bar' 'baz' 'foo' 'fuzz'
     initial_point 'bar'
     descriptors 's1'

method
  vector_parameter_study
    num_steps = 3
    # Add 2.0 to x1 and increment s1 by 1 element in each step
    step_vector =    2.0      1