/**
* @brief Allocates the basic Griewank-Rosenbrock problem.
*/
static coco_problem_t *f_griewank_rosenbrock_allocate(const size_t number_of_variables) {
coco_problem_t *problem = coco_problem_allocate_from_scalars("Griewank Rosenbrock function",
f_griewank_rosenbrock_evaluate, NULL, number_of_variables, -5.0, 5.0, 1);
coco_problem_set_id(problem, "%s_d%02lu", "griewank_rosenbrock", number_of_variables);
/* Compute best solution */
f_griewank_rosenbrock_evaluate(problem, problem->best_parameter, problem->best_value);
return problem;
}
static coco_problem_t *f_griewank_rosenbrock(const size_t number_of_variables) {
size_t i, problem_id_length;
coco_problem_t *problem = coco_problem_allocate(number_of_variables, 1, 0);
problem->problem_name = coco_strdup("griewank rosenbrock function");
/* Construct a meaningful problem id */
problem_id_length = (size_t) snprintf(NULL, 0, "%s_%02lu", "griewank rosenbrock",
(long) number_of_variables);
problem->problem_id = coco_allocate_memory(problem_id_length + 1);
snprintf(problem->problem_id, problem_id_length + 1, "%s_%02lu", "griewank rosenbrock",
(long) number_of_variables);
problem->number_of_variables = number_of_variables;
problem->number_of_objectives = 1;
problem->number_of_constraints = 0;
problem->evaluate_function = f_griewank_rosenbrock_evaluate;
for (i = 0; i < number_of_variables; ++i) {
problem->smallest_values_of_interest[i] = -5.0;
problem->largest_values_of_interest[i] = 5.0;
problem->best_parameter[i] = 1.0; /* z^opt = 1*/
}
/* Calculate best parameter value */
f_griewank_rosenbrock_evaluate(problem, problem->best_parameter, problem->best_value);
return problem;
}