C#•17mo ago

I really need to complete the simulated annealing method for the traveling salesman problem

Deadlines are running out, there is a program that should work, but it has errors that I cannot fix due to poor knowledge of the code, please help. I don't even know what part of the code is wrong

10 Replies

FongE👑OP•17mo ago

When I enter all the values I only get 1 error(screenshot) I understand there is an error somewhere here

 public double CalculateEnergy(int[] permutation)
        {
            double energy = 0;
            for (int i = 0; i < permutation.Length - 1; i++)
            {
                energy += EuclideanPath.CalculateDistance(permutation[i], permutation[i + 1]);
            }
            energy += EuclideanPath.CalculateDistance(permutation.Last(), permutation.First());
            return energy;
        }
public class EuclideanPath : IEuclideanPath
    {
        private List<Point> cities;

        public EuclideanPath(List<Point> cities)
        {
            this.cities = cities;
        }

        public double CalculateDistance(int city1, int city2)
        {
            Point p1 = cities[city1];
            Point p2 = cities[city2];
            return Math.Sqrt(Math.Pow(p2.X - p1.X, 2) + Math.Pow(p2.Y - p1.Y, 2));
        }
    }

 public double CalculateEnergy(int[] permutation)
        {
            double energy = 0;
            for (int i = 0; i < permutation.Length - 1; i++)
            {
                energy += EuclideanPath.CalculateDistance(permutation[i], permutation[i + 1]);
            }
            energy += EuclideanPath.CalculateDistance(permutation.Last(), permutation.First());
            return energy;
        }
public class EuclideanPath : IEuclideanPath
    {
        private List<Point> cities;

        public EuclideanPath(List<Point> cities)
        {
            this.cities = cities;
        }

        public double CalculateDistance(int city1, int city2)
        {
            Point p1 = cities[city1];
            Point p2 = cities[city2];
            return Math.Sqrt(Math.Pow(p2.X - p1.X, 2) + Math.Pow(p2.Y - p1.Y, 2));
        }
    }

MiKom•17mo ago

Do you create a new instance of the EuclideanPath class anywhere? The error is weird though because it seems like you're calling a non-static method on a class name. That shouldn't even compile.

FongE👑OP•17mo ago

Now I have created an EuclideanPath class object in the CalculateEnergy function. The class object looks like this: EuclideanPath euclideanPath = new EuclideanPath(cities); But it says that the name сities does not exist in the current context

MiKom•17mo ago

Well, EuclideanPath constructor takes cities as a parameter, it has to come from somewhere. I presume that cities should be an input to the program? So you probably have to construct the liset of the cities by reading some data from somewhere.

FongE👑OP•17mo ago

Cities are created through this function

private List<Point> GenerateCities(int numCities)
        {
            List<Point> cities = new List<Point>();
            for (int i = 0; i < numCities; i++)
            {
                int x = random.Next(picDrawing.Width - 10);
                int y = random.Next(picDrawing.Height - 10);
                cities.Add(new Point(x, y));
            }
            return cities;
        }

private List<Point> GenerateCities(int numCities)
        {
            List<Point> cities = new List<Point>();
            for (int i = 0; i < numCities; i++)
            {
                int x = random.Next(picDrawing.Width - 10);
                int y = random.Next(picDrawing.Height - 10);
                cities.Add(new Point(x, y));
            }
            return cities;
        }

MiKom•17mo ago

ok, then:

var cities = GenerateCities(20); //or whatever number you want
EuclideanPath euclideanPath = new(cities);

var cities = GenerateCities(20); //or whatever number you want
EuclideanPath euclideanPath = new(cities);

should work

FongE👑OP•17mo ago

I don’t quite understand where to write this part of the code, does it replace my GenerateCities method?

MiKom•17mo ago

probably in the "CalculateEnergy" method also, I updated the code above it was wrong and then replace EuclideanPath with euclideanPath. Class with an instance

FongE👑OP•17mo ago

The problem is that the number of cities is taken from the textbox

if (int.TryParse(txtCitiesCountTextBox.Text, out numCities) && numCities > 0)
            {
                cities = GenerateCities(numCities);
                DrawCities();
            }

if (int.TryParse(txtCitiesCountTextBox.Text, out numCities) && numCities > 0)
            {
                cities = GenerateCities(numCities);
                DrawCities();
            }

MiKom•17mo ago

Do you have a debugger available?

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I really need to complete the simulated annealing method for the traveling salesman problem

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