Extreme Optimization > QuickStart Samples > Basic Vectors QuickStart Sample (C#)

Extreme Optimization QuickStart Samples

Basic Vectors QuickStart Sample (C#)

Illustrates the basic use of the Vector class (Extreme.Mathematics.LinearAlgebra namespace) for working with vectors in C#.

VB.NET code Back to QuickStart Samples

using System;

namespace Extreme.Mathematics.QuickStart.CSharp
{
    // The Vector class resides in the Extreme.Mathematics.LinearAlgebra
    // namespace.
    using Extreme.Mathematics.LinearAlgebra;

    /// <summary>
    /// Illustrates the use of the Vector class in the 
    /// Extreme.Mathematics.LinearAlgebra namespace.
    /// </summary>
    class BasicVectors
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            //
            // Constructing vectors
            //

            // Option #1: specify the number of elements. All
            // components are set to 0.
            Vector v1 = new GeneralVector(5);
            // Option #2: specify the components:
            Vector v2 = new GeneralVector(1, 2, 3, 4, 5);
            // Option #3: specify the components as a double array.
            // By default, the components are copied to a storage
            // area internal to the Vector.
            double[] components = new double[] {1, 2, 3, 4, 5};
            Vector v3 = new GeneralVector(components);
            // Option #4: same as above, but specify whether
            // to copy the components, or use the array as 
            // internal storage.
            Vector v4 = new GeneralVector(components, false);
            // Changing a value in the original vector changes
            // the resulting vector.
            Console.WriteLine("v4 = {0}", v4);
            components[3] = 1;
            Console.WriteLine("v4 = {0}", v4);
            // Option #5: same as #3, but specify the length of
            // the Vector. The remaining elements in the component
            // array will be ignored.
            Vector v5 = new GeneralVector(4, components);
            // Option #6: same as #5, but specify whether
            // to copy the components, or use the array as 
            // internal storage.
            Vector v6 = new GeneralVector(4, components, false);

            //
            // Vector properties
            //
            
            // The Length property gives the number of components
            // of a Vector:
            Console.WriteLine("v1.Length = {0}", v1.Length);
            // The GetComponents method returns a double array
            // that contains the components of the vector.
            // This is always a copy:
            components = v2.GetComponents();
            Console.WriteLine("Effect of shared storage:");
            Console.WriteLine("v2[2] = {0}", v2[2]);
            components[2] = 1;
            Console.WriteLine("v2[2] = {0}", v2[2]);

            //
            // Accessing vector elements
            //

            // The Vector class defines an indexer property that
            // takes a zero-based index.
            Console.WriteLine("Assigning with private storage:");
            Console.WriteLine("v1[2] = {0}", v1[2]);
            // You can assign to this property:
            v1[2] = 7;
            Console.WriteLine("v1[2] = {0}", v1[2]);
            // The vectors v4 and v6 had the copy parameter in the
            // constructor set to false. As a result, they share 
            // their component storage. Changing one vector also 
            // changes the other:
            Console.WriteLine("Assigning with shared storage:");
            Console.WriteLine("v4[1] = {0}", v4[1]);
            v6[1] = 7;
            Console.WriteLine("v4[1] = {0}", v4[1]);

            // The SetValue method sets all components of a vector
            // to the same value:
            v1.SetValue(1);
            Console.WriteLine("v1 = {0}", v1);
            // The Zero method sets all components to 0:
            v1.Zero();
            Console.WriteLine("v1 = {0}", v1);

            //
            // Copying and cloning vectors
            //

            // A shallow copy of a vector constructs a vector
            // that shares the component storage with the original.
            // This is done using the ShallowCopy method:
            Console.WriteLine("Shallow copy vs. clone:");
            Vector v7 = v2.ShallowCopy();
            // The clone method creates a full copy.
            Vector v8 = v2.Clone();
            // When we change v2, v7 changes, but v8 is left
            // unchanged.
            Console.WriteLine("v2[1] = {0}", v2[1]);
            v2[1] = -2;
            Console.WriteLine("v7[1] = {0}", v7[1]);
            Console.WriteLine("v8[1] = {0}", v8[1]);
            // We can give a vector its own component storage
            // by calling the CloneData method:
            Console.WriteLine("CloneData:");
            v7.CloneData();
            // Now, changing the original v2 no longer changes v7:
            v2[1] = 4;
            Console.WriteLine("v7[1] = {0}", v7[1]);
            // The CopyTo method copies the components of a Vector
            // to a variety of destinations. It may be a Vector:
            Console.WriteLine("CopyTo:");
            v6.CopyTo(v1);
            Console.WriteLine("v6 = {0}", v6);
            Console.WriteLine("v1 = {0}", v1);
            // You can specify an index where to start copying
            // in the destination vector:
            v6.CopyTo(v1, 1);
            Console.WriteLine("v1 = {0}", v1);
            // Or you can copy to a double array:
            v6.CopyTo(components);

            Console.Write("Press Enter key to exit...");
            Console.ReadLine();
        }
    }
}

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