config_hs {EmiR}

Configuration object for the Harmony Search Algorithm

Description

Create a configuration object for the Harmony Search Algorithm (HS). 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_hs(
  iterations,
  population_size,
  iterations_same_cost = NULL,
  absolute_tol = NULL,
  considering_rate = 0.5,
  adjusting_rate = 0.5,
  distance_bandwidth = 0.1
)

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.

adjusting_rate

probability of the pitch adjustment in case of a component recalled from the harmony memory.

distance_bandwidth

amplitude of the random pitch adjustment.

Value

config_hs returns an object of class HSConfig.

References

Lee KS, Geem ZW (2004). “A new structural optimization method based on the harmony search algorithm.” Computers & Structures, 82(9-10), 781–798. doi:10.1016/j.compstruc.2004.01.002.

Examples

conf <- config_hs(iterations = 100, population_size = 50, iterations_same_cost = NULL,
absolute_tol = NULL, considering_rate = 0.5, adjusting_rate = 0.5,
distance_bandwidth = 0.1)