config_ihs {EmiR}

Configuration object for the Improved Harmony Search Algorithm

Description

Create a configuration object for the Improved Harmony Search Algorithm (IHS). At minimum the number of iterations (parameter iterations) and the number of solutions in the harmony memory (parameter population_size) have to be provided.

Usage

config_ihs(
  iterations,
  population_size,
  iterations_same_cost = NULL,
  absolute_tol = NULL,
  considering_rate = 0.5,
  min_adjusting_rate = 0.3,
  max_adjusting_rate = 0.99,
  min_distance_bandwidth = 1e-04,
  max_distance_bandwidth = 1
)

Arguments

iterations

maximum number of iterations.

population_size

number of solutions in the harmony memory.

iterations_same_cost

maximum number of consecutive iterations with the same (see the parameter absolute_tol) best cost before ending the minimization. If NULL the minimization continues for the number of iterations specified by the parameter iterations. Default is NULL.

absolute_tol

absolute tolerance when comparing best costs from consecutive iterations. If NULL the machine epsilon is used. Default is NULL.

considering_rate

probability for each component of a newly generated solution to be recalled from the harmony memory.

min_adjusting_rate

minimum value of the pitch adjustment probability.

max_adjusting_rate

maximum value of the pitch adjustment probability.

min_distance_bandwidth

minimum amplitude of the random pitch adjustment.

max_distance_bandwidth

maximum amplitude of the random pitch adjustment.

Value

config_ihs returns an object of class IHSConfig.

References

Mahdavi M, Fesanghary M, Damangir E (2007). “An improved harmony search algorithm for solving optimization problems.” Applied Mathematics and Computation, 188(2), 1567–1579. doi:10.1016/j.amc.2006.11.033.

Examples

conf <- config_ihs(iterations = 100, population_size = 50, iterations_same_cost = NULL,
absolute_tol = NULL,considering_rate = 0.5, min_adjusting_rate = 0.3,
max_adjusting_rate = 0.99, min_distance_bandwidth = 0.0001, max_distance_bandwidth = 1)