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 Home » Tip Bank » .NET » VB.NET » Arrays
Language: VB7
Expertise: Intermediate
Oct 13, 2003

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# TransposeMatrix - Evaluate the transposed matrix

``````' Evaluate the transposed matrix
' A transposed matrix is the array you get when you "rotate" a bi-dimensional
' array
'
' Example
'   Dim arr(,) As Double = {{0.0, 0.1, 0.2}, {1.0, 1.1, 1.2}}
'   Dim i, j As Integer

'   ' print the original matrix
'   Debug.WriteLine("Original matrix")
'   For i = 0 To arr.GetUpperBound(0)
'       For j = 0 To arr.GetUpperBound(1)
'           Debug.Write(arr(i, j) & " - ")
'       Next
'       Debug.WriteLine("")
'   Next

'   ' transpose the matrix and print it
'   Dim arr2(,) As Double = TransposeMatrix(arr)
'   Debug.WriteLine("Transposed matrix")
'   For i = 0 To arr2.GetUpperBound(0)
'       For j = 0 To arr2.GetUpperBound(1)
'           Debug.Write(arr2(i, j) & " - ")
'       Next
'       Debug.WriteLine("")
'   Next

Function TransposeMatrix(ByVal arr(,) As Double) As Double(,)
Dim startRow As Integer, startCol As Integer
Dim endRow As Integer, endCol As Integer
Dim row As Integer, col As Integer

' get size of original matrix
startRow = arr.GetLowerBound(0)
endRow = arr.GetUpperBound(0)
startCol = arr.GetLowerBound(1)
endCol = arr.GetUpperBound(1)

' prepare the result matrix
Dim res(endCol, endRow) As Double

' transpose the matrix
For row = startRow To endRow
For col = startCol To endCol
res(col, row) = arr.GetValue(row, col)
Next
Next

' return the transposed result
Return res
End Function
``````
Marco Bellinaso

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