From 825a80b7efe9d40c7b9da61b8a508e89f47da856 Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fl.fischer@fau.de>
Date: Wed, 13 May 2020 22:43:17 +0200
Subject: My simple particle swarm optimization

---
 problems.h | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 problems.h

(limited to 'problems.h')

diff --git a/problems.h b/problems.h
new file mode 100644
index 0000000..d612f8a
--- /dev/null
+++ b/problems.h
@@ -0,0 +1,82 @@
+#pragma once
+
+#include "pso.h"
+
+typedef struct problem {
+	char* name;
+	interval_t interval;
+	double(*func)(particle_t*);
+} problem_t;
+
+static const interval_t sphere_interval = {-500, 500};
+static double sphere_func(particle_t* particle) {
+	size_t size = particle->x->size;
+	double sum = 0;
+
+	for (size_t i = 0; i < size; ++i) {
+		double x = particle->x->elements[i];
+		if (x < sphere_interval.start || x > sphere_interval.end)
+			return INFINITY;
+
+		sum += pow(x, 2);
+	}
+	return sum;
+}
+static const problem_t sphere = {"sphere", sphere_interval, sphere_func};
+
+
+static const interval_t rosenbrock_interval = {-30, 30};
+static double rosenbrock_func(particle_t* particle) {
+	size_t size = particle->x->size;
+	double sum = 0;
+
+	for (size_t i = 0; i < size - 1; ++i) {
+		double x = particle->x->elements[i];
+		double next_x = particle->x->elements[i + 1];
+
+		if (x < rosenbrock_interval.start || x > rosenbrock_interval.end
+		        || next_x < rosenbrock_interval.start || next_x > rosenbrock_interval.end)
+			return INFINITY;
+
+		sum += 100 * pow(next_x - pow(x, 2), 2) + pow((1 - x), 2);
+	}
+	return sum;
+}
+static const problem_t rosenbrock = {"rosenbrock", rosenbrock_interval, rosenbrock_func};
+
+static const interval_t rastrigin_interval = {-5.12, 5.12};
+static double rastrigin_func(particle_t* particle) {
+	size_t size = particle->x->size;
+	double sum = 0;
+
+	for (size_t i = 0; i < size; ++i) {
+		double x = particle->x->elements[i];
+
+		if (x < rastrigin_interval.start || x > rastrigin_interval.end)
+			return INFINITY;
+
+		sum += pow(x, 2) - 10 * cos(2 * M_PI * x);
+	}
+	return 10 * size + sum;
+}
+static const problem_t rastrigin = {"rastrigin", rastrigin_interval, rastrigin_func};
+
+static const interval_t schwefel_interval = {-500, 500};
+static double schwefel_func(particle_t* particle) {
+	size_t size = particle->x->size;
+	double sum = 0;
+
+	for (size_t i = 0; i < size; ++i) {
+		double x = particle->x->elements[i];
+
+		if (x < schwefel_interval.start || x > schwefel_interval.end)
+			return INFINITY;
+
+		sum += -1 * x * sin(sqrt(fabs(x)));
+	}
+	return sum;
+}
+static const problem_t schwefel = {"schwefel", schwefel_interval, schwefel_func};
+
+#define NUM_PROBLEMS 4
+static problem_t problems[NUM_PROBLEMS] = {sphere, rosenbrock, rastrigin, schwefel};
-- 
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