NMath User's Guide

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52.1 Creating ADO.NET Objects from Vectors and Matrices (.NET, C#, CSharp, VB, Visual Basic, F#)

Real-value NMath vector and matrix classes provide ToDataTable() methods for creating ADO.NET DataTable objects. Complex number vector and matrix classes provide paired methods ­ToRealDataTable() and ToImagDataTable() for creating DataTable objects containing the real and imaginary parts, respectively.

NOTE—Values are copied by all methods that create data tables.

For example, this code creates a data table of one column containing the values in a vector:

Code Example – C#

using System.Data;





var v = new FloatVector( "45.4 -0.032 99 2.34" );




DataTable table = v.ToDataTable();




Code Example – VB


Imports System.Data








Dim V As New FloatVector("45.4 -0.032 99 2.34")




Dim Table As DataTable = V.ToDataTable()




By default, the table is named Table.
You can also pass a non-default table name to the ToDataTable()
method. Thus, this code creates a data table named MyMatrixTable
containing the values in a DoubleMatrix:


Code Example – C#


using System.Data;








var A = new DoubleMatrix( 8, 5, 3.1415 );




DataTable table = A.ToDataTable( "MyMatrixTable" );




Code Example – VB


Imports System.Data








Dim A As New DoubleMatrix(8, 5, 3.1415)




Dim Table As DataTable = A.ToDataTable("MyMatrixTable")




This code illustrates creating paired data tables containing
the real and imaginary parts a FloatComplexMatrix:


Code Example – C#


using System.Data;








string s =




   "2 x 2 [ (4.54,9.78) (3.2,-4.78) (-4.32,2.23) (4.3234,-1.0) ]";




var A = new FloatComplexMatrix( s );




     




DataTable reals = A.ToRealDataTable( "RealParts" );




DataTable imags = A.ToImagDataTable( "ImaginaryParts" );




Code Example – VB


Imports System.Data








Dim S As String =




  "2 x 2 [ (4.54,9.78) (3.2,-4.78) (-4.32,2.23) (4.3234,-1.0) ]"




Dim A As New FloatComplexMatrix(S)








Dim Reals As DataTable = A.ToRealDataTable("RealParts")




Dim Images As DataTable = A.ToImagDataTable("ImaginaryParts")




By default, the columns in a data table created from
a vector or matrix are named column1, column2, and so on. If you wish to specify non-default
column names, call Columns() on the returned
DataTable object to obtain a DataColumnCollection, then iterate over the
collection and set the ColumnName property
on each DataColumn object to the desired
name. 





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