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#' Griewank test function generator.
#'
#' The definition used is
#'
#' \deqn{f(x) = \displaystyle \sum_{i=1}^n \frac{x_i^2}{4000} - \prod_{i=1}^n \cos \left(\frac{x_i}{\sqrt{i}}\right) + 1}
#'
#' @param dimensions [\code{integer(1)}] Size of parameter space.
#' @return A \code{soo_function}.
#'
#' @references A. O. Griewank. Generalized descent for global optimization.
#' Journal of Optimization Theory and Applications 34:11-39, 1981.
#'
#' @export
#' @useDynLib soobench do_f_griewank
generate_griewank_function <- function(dimensions)
soo_function(name="Griewank",
id=sprintf("griewank-%id", dimensions),
fun=function(x, ...) .Call(do_f_griewank, x),
dimensions=dimensions,
lower_bounds=rep(-600, dimensions),
upper_bounds=rep(600, dimensions),
best_par=rep(0, dimensions),
best_value=0)
## Set attributes for soo_function_generator class.
class(generate_griewank_function) <- c("soo_function_generator", "function")
attr(generate_griewank_function, "id") <- "griewank"
attr(generate_griewank_function, "name") <- "Griewank test function"
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