Question

How to sum 2D array (matrix) rows in VB.NET

Answer 1

Module Module1

    Sub Main()

        Dim matrix(,) As Integer = New Integer(,) {{13, 22, 43, 34},
                                                   {43, 54, 67, 98},
                                                   {88, 79, 11, 998}}

        Dim rows_sum() As Integer = New Integer() {0, 0, 0}

        sum_matrix_rows(matrix, rows_sum)

        For i As Integer = 0 To 2
            Console.WriteLine(rows_sum(i))
        Next

    End Sub

    Sub sum_matrix_rows(matrix(,) As Integer, rows_sum() As Integer)

        Dim rows = matrix.GetUpperBound(0)
        Dim cols = matrix.GetUpperBound(1)

        For i As Integer = 0 To rows
            For j As Integer = 0 To cols
                rows_sum(i) += matrix(i, j)
            Next
        Next
    End Sub

End Module

' run:
' 
' 112
' 262
' 1176

 

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