bbiwarg-original/bbiwarg/DataSource/VectorExtender.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using MathNet.Numerics.LinearAlgebra.Single;

namespace bbiwarg.DataSource
{
    public static class VectorExtender
    {
        public static Vector Cross(this Vector v, Vector other)
        {
            if ((v.Count != 3 || other.Count != 3))
            {
                string message = "Vectors must have a length of 3.";
                throw new Exception(message);
            }
            Vector result = new DenseVector(3);
            result[0] = v[1] * other[2] - v[2] * other[1];
            result[1] = -v[0] * other[2] + v[2] * other[0];
            result[2] = v[0] * other[1] - v[1] * other[0];

            return result;
        }
        
        public static float x(this Vector v)
        {
            return v[0];
        }

        public static float y(this Vector v)
        {
            return v[1];
        }

        public static float z(this Vector v)
        {
            return v[2];
        }
    }
}