← All NMath Core Code Examples

```using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using CenterSpace.NMath.Core;
using System.IO;

{
/// <summary>
/// A .NET example in C# showing how to display a DataFrame in an ADO.NET DataGrid.
/// </summary>
/// <remarks>
/// Changes to the grid are fed back into a new DataFrame.
/// Descriptive statistics are calculated and displayed next to the grid.
/// </remarks>
{
private DataFrame data;

private System.Windows.Forms.DataGrid dataGrid1;
private System.Windows.Forms.Label title;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Label recordLongJumpLabel;
private System.Windows.Forms.Label averageLongJumpLabel;
private System.Windows.Forms.Label shortestLabel;
private System.Windows.Forms.Label varianceLabel;
private System.Windows.Forms.TextBox variance;
private System.Windows.Forms.TextBox shortest;
private System.Windows.Forms.TextBox record;
private System.Windows.Forms.TextBox average;

/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;

{
// Required for Windows Form Designer support
InitializeComponent();

// Data consists of high jump, discus throw, long jump marks set
// during Olympic years from 1896 - 1984.

// Adjust year to 4 digits.  Eg. -4 => 1896.
int yearColumn = data.IndexOfColumn( "Olympic_Year" );
for ( int i = 0; i < data.Rows; i++ )
{
double original = (double) data[i, yearColumn];
data[i, yearColumn] = original + 1900;
}

// Permute columns so year comes first.
data.PermuteColumns( 1, 0 );

// Convert my DataFrame to a DataTable.
DataTable table = data.ToDataTable();

// Remove the index column.

// Bind to DataGrid.
dataGrid1.DataSource = table;

Recompute();
}

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if ( disposing )
{
if ( components != null )
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.dataGrid1 = new System.Windows.Forms.DataGrid();
this.title = new System.Windows.Forms.Label();
this.button1 = new System.Windows.Forms.Button();
this.recordLongJumpLabel = new System.Windows.Forms.Label();
this.averageLongJumpLabel = new System.Windows.Forms.Label();
this.record = new System.Windows.Forms.TextBox();
this.average = new System.Windows.Forms.TextBox();
this.shortestLabel = new System.Windows.Forms.Label();
this.varianceLabel = new System.Windows.Forms.Label();
this.variance = new System.Windows.Forms.TextBox();
this.shortest = new System.Windows.Forms.TextBox();
( (System.ComponentModel.ISupportInitialize) ( this.dataGrid1 ) ).BeginInit();
this.SuspendLayout();
//
// dataGrid1
//
this.dataGrid1.BackgroundColor = System.Drawing.Color.White;
this.dataGrid1.CaptionVisible = false;
this.dataGrid1.DataMember = "";
this.dataGrid1.Location = new System.Drawing.Point( 24, 80 );
this.dataGrid1.Name = "dataGrid1";
this.dataGrid1.Size = new System.Drawing.Size( 168, 312 );
this.dataGrid1.TabIndex = 0;
//
// title
//
this.title.Font = new System.Drawing.Font( "Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ( (System.Byte) ( 0 ) ) );
this.title.Location = new System.Drawing.Point( 72, 16 );
this.title.Name = "title";
this.title.Size = new System.Drawing.Size( 272, 23 );
this.title.TabIndex = 1;
this.title.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
//
// button1
//
this.button1.Location = new System.Drawing.Point( 232, 320 );
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size( 112, 24 );
this.button1.TabIndex = 2;
this.button1.Text = "Recompute";
this.button1.Click += new System.EventHandler( this.RecomputeValues );
//
// recordLongJumpLabel
//
this.recordLongJumpLabel.Location = new System.Drawing.Point( 232, 96 );
this.recordLongJumpLabel.Name = "recordLongJumpLabel";
this.recordLongJumpLabel.Size = new System.Drawing.Size( 80, 32 );
this.recordLongJumpLabel.TabIndex = 3;
this.recordLongJumpLabel.Text = "Record";
//
// averageLongJumpLabel
//
this.averageLongJumpLabel.Location = new System.Drawing.Point( 232, 144 );
this.averageLongJumpLabel.Name = "averageLongJumpLabel";
this.averageLongJumpLabel.Size = new System.Drawing.Size( 56, 24 );
this.averageLongJumpLabel.TabIndex = 4;
this.averageLongJumpLabel.Text = "Average";
//
// record
//
this.record.Location = new System.Drawing.Point( 320, 96 );
this.record.Name = "record";
this.record.Size = new System.Drawing.Size( 72, 20 );
this.record.TabIndex = 5;
this.record.Text = "";
//
// average
//
this.average.Location = new System.Drawing.Point( 320, 144 );
this.average.Name = "average";
this.average.Size = new System.Drawing.Size( 72, 20 );
this.average.TabIndex = 6;
this.average.Text = "";
//
// shortestLabel
//
this.shortestLabel.Location = new System.Drawing.Point( 232, 192 );
this.shortestLabel.Name = "shortestLabel";
this.shortestLabel.Size = new System.Drawing.Size( 56, 16 );
this.shortestLabel.TabIndex = 7;
this.shortestLabel.Text = "Shortest";
//
// varianceLabel
//
this.varianceLabel.Location = new System.Drawing.Point( 232, 240 );
this.varianceLabel.Name = "varianceLabel";
this.varianceLabel.Size = new System.Drawing.Size( 72, 24 );
this.varianceLabel.TabIndex = 8;
this.varianceLabel.Text = "Variance";
//
// variance
//
this.variance.Location = new System.Drawing.Point( 320, 240 );
this.variance.Name = "variance";
this.variance.Size = new System.Drawing.Size( 72, 20 );
this.variance.TabIndex = 9;
this.variance.Text = "";
//
// shortest
//
this.shortest.Location = new System.Drawing.Point( 320, 192 );
this.shortest.Name = "shortest";
this.shortest.Size = new System.Drawing.Size( 72, 20 );
this.shortest.TabIndex = 10;
this.shortest.Text = "";
//
//
this.AutoScaleBaseSize = new System.Drawing.Size( 5, 13 );
this.ClientSize = new System.Drawing.Size( 418, 416 );
this.shortest,
this.variance,
this.varianceLabel,
this.shortestLabel,
this.average,
this.record,
this.averageLongJumpLabel,
this.recordLongJumpLabel,
this.button1,
this.title,
this.dataGrid1} );
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
( (System.ComponentModel.ISupportInitialize) ( this.dataGrid1 ) ).EndInit();
this.ResumeLayout( false );

}
#endregion

static void Main()
{
}

private void RecomputeValues( object sender, System.EventArgs e )
{
Recompute();
}

private void Recompute()
{
data = new DataFrame( (DataTable) dataGrid1.DataSource );
average.Text = StatsFunctions.Mean( data["Long_Jump"] ).ToString();
record.Text = StatsFunctions.MaxValue( data["Long_Jump"] ).ToString();
shortest.Text = StatsFunctions.MinValue( data["Long_Jump"] ).ToString();
variance.Text = StatsFunctions.Variance( data["Long_Jump"] ).ToString();
}

}  // class

}  // namespace

```
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