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Tip of the Day
Language: VB6
Expertise: Intermediate
Nov 25, 2000

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TransposeMatrix - Rotate a bi-dimensional array

' evaluate the transposed matrix
'
' a transposed matrix is the array you get when
' you "rotate" a bi-dimensional array

Function TransposeMatrix(arr() As Double) As Double()
    Dim startRow As Long, startCol As Long
    Dim endRow As Long, endCol As Long
    Dim r As Long, c As Long
    Dim tmp As Double
    
    ' get size of original matrix
    startRow = LBound(arr)
    endRow = UBound(arr)
    startCol = LBound(arr, 2)
    endCol = UBound(arr, 2)
    ' prepare the result matrix
    ReDim res(startCol To endCol, startRow To endRow) As Double
    
    ' transpose the matrix
    For r = startRow To endRow
        For c = startCol To endCol
            res(c, r) = arr(r, c)
        Next
    Next
    
    ' return the transposed result
    TransposeMatrix = res

End Function

Francesco Balena
 
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