.NET數學庫NMath使用教程——矩陣

NMath是一個適用於全部.NET語言，如C＃、Visual Basic、F＃和.NET的數學庫，它包含了.NET平臺上的面向對象數字計算的基礎類。咱們將以連載的形式向你們介紹NMath的實用教程。本節展現在NMatht數學庫中的矩陣類函數。

最新版NMath點擊下載

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NMath矩陣類是在返回IEnumerator對象時，會提供的標準.NET GetEnumerator（）方法。

例：    

代碼示例 - C＃

int rows = 13，cols = 3; var A = new DoubleMatrix（rows，cols，0，.25）; IEnumerator elements = A.GetEnumerator（）; var data = new double [rows * cols]; i = 0; while（elements.MoveNext（））{ 
  data [i ++] =（double）elements.Current; }

代碼示例 - VB

Dim Rows As Integer = 13
Dim Cols As Integer = 3
Dim A As New DoubleMatrix(Rows, Cols, 0.0, 0.25)
Dim Elements As IEnumerator = A.GetEnumerator()

Dim Data(Rows * Cols) As Double

Dim I As Integer = 0
While Elements.MoveNext()
  I += 1
  Data(I) = CType(Elements.Current, Double)
End While

    注意：IEnumerator 上的Current屬性會返回集合中的當前對象，因此必須將其強制轉換爲適當的類型。NMath 還提供自定義strongly-typed示例：IFloatEnumerator， IDoubleEnumerator，IFloatComplexEnumerator和IDoubleComplexEnumerator，這種形式的出現能夠避免本身製做時出現的錯誤。   

例：

代碼示例 - C＃ 

int rows = 13, cols = 3;
var A = new DoubleMatrix( rows, cols, 0, .25 );IDoubleEnumerator elements = A.GetDoubleEnumerator();

var data = new double[rows*cols];
i = 0;
while ( elements.MoveNext() )
{
  data[i++] = elements.Current;       // No need to cast to double
}

  代碼示例 - VB

Dim Rows As Integer = 13
Dim Cols As Integer = 3
Dim A As New DoubleMatrix(Rows, Cols, 0.0, 0.25)
Dim Elements As IDoubleEnumerator = A.GetDoubleEnumerator()

Dim Data(Rows * Cols) As Double
Dim I As Integer = 0
While Elements.MoveNext()
  I += 1
  Data(I) = Elements.Current ' No need to cast to Double
End While