# C# Vector Slice Example

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```using System;

using CenterSpace.NMath.Core;

namespace CenterSpace.NMath.Examples.CSharp
{
/// <summary>
/// A .NET example in C# showing how to use the indexing class Slice with the vector classes.
/// </summary>
public class VectorSliceExample
{
static void Main( string[] args )
{
int length = 10;

Console.WriteLine();

var u = new FloatVector( length, 0, 1 );
Console.WriteLine( "u = {0}", u.ToString() ); // u = [0 1 2 3 4 5 6 7 8 9]

// Last five elements of the vector u:
FloatVector uLast5 = u[new Slice( 5, 5 )];
Console.WriteLine( "uLast5 = {0}", uLast5.ToString() ); // uLast5 = [5 6 7 8 9]

// You can use negative strides too. Here is the vector u, reversed.
FloatVector uRev = u[new Slice( length - 1, length, -1 )];
Console.WriteLine( "uRev = {0}", uRev.ToString() ); // uRev = [9 8 7 6 5 4 3 2 1 0]

// Notice that when you create a new FloatVector using the Range or Slice class,
// you are creating a different "view" of the vectors data. That is, the
// FloatVector instance returned by the indexing operator taking a Range object,
// and the FloatVector instance being indexed share the same data:
uRev[0] = 0;
Console.WriteLine( "uRev = {0}", uRev.ToString() ); // uRev = [0 8 7 6 5 4 3 2 1 0]
Console.WriteLine( "u = {0}", u.ToString() ); // u = [0 1 2 3 4 5 6 7 8 0]

// Finally, we use the FloatVector method Set(Slice) to change the contents of u
// to alternate values 0 and 1
var evenElts = new Slice( 0, length / 2, 2 );
var oddElts = new Slice( 1, length / 2, 2 );
u.Set( evenElts, 0 );
u.Set( oddElts, 1 );
Console.WriteLine( "u = {0}", u.ToString() ); // u = [0 1 0 1 0 1 0 1 0 1]

Console.WriteLine();
Console.WriteLine( "Press Enter Key" );
Console.Read();

} // Main

}// class

}// namespace

```
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