1. Two-Dimensional Arrays

2. Two-dimensional arrays variables store the contents of tables or matrices. Example: Dim arrTable(1 to 5, 1 to 5) As Integer first row last row first column last column

3. Using For Loops to Manipulate Arrays You can efficiently process a multidimensional array by using nested For loops. The outer loop of the For loop controls the rows, and the inner loop of the For loop controls the columns

4. Private Sub FillArray(A() As Double) Dim I As Integer, J As Integer For I = 1 To 5 For J = 1 To 5 A(I, J) = I * 10 + J Next J Next I End Sub

5. Private Sub DisplayArray(A() As Double) Dim I As Integer, J As Integer For I = 1 To 5 For J = 1 To 5 picOutput.Print A(I, J); Next J picOutput.Print Next I End Sub Private Sub Command1_Click() Dim MatrixA(1 To 5, 1 To 5) As Double Call FillArray(MatrixA()) Call DisplayArray(MatrixA()) End Sub

6. Reading Table Data from a Data File into a Two-Dimensional Array Chicago Los Angles New York Philadelphia Chicago 0 2054 802 738 Los Angles 2054 0 2786 2706 New York 802 2786 0 100 Philadelphia 738 2706 100 0

7. Data File for the Table Data 0, 2054, 802, 738 2054, 0, 2786, 2706 802, 2786, 0, 100 738, 2706, 100, 0

8. Sub Procedure to Input Data from the Data File into a Two-dimensional Array Private Sub Form_Load() Dim arrTable(1 To 4, 1 To 4) As Single Dim row As Integer, col As Integer 'Fill two-dimensional array with intercity mileages 'Assume the data has been placed in the file "DISTANCE.TXT" '(First line of the file is 0, 2054, 802, 738) Open App.Path & "\DISTANCE.TXT" For Input As #1 For row = 1 To 4 For col = 1 To 4 Input #1, arrTable(row, col) Next col Next row Close #1 End Sub