How to Store values in 2 dimensional array in vb.net

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How to Store values in 2 dimensional array in vb.net.I written like this but its not correct

C#

Dim arr(,) As String
For i As Integer = 0 To 10
   For j As Integer = 0 To 1
      ReDim Preserve arr(alX(i), alY(i))
   Next
Next

Posted 17-Sep-13 20:44pm

MAKReddy

Updated 17-Sep-13 20:55pm

Thanks7872

v2

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CPallini 18-Sep-13 3:21am

What is your purpose? Please elaborate.

1 solution

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Rakesh Meel · Answer 1 · 2013-09-17T21:20:00

Solution 1

you Can use this code.....

VB

Const ARR_SIZE_X As Integer = 9999999
Const ARR_SIZE_y As Integer = 5
Dim a2(ARR_SIZE_y, ARR_SIZE_X) As Double

        For y = 0 To ARR_SIZE_y
            For x = 0 To ARR_SIZE_X
              Redim preserve a2(ARR_SIZE_y,ARR_SIZE_X)             
              a2(y, x) = a1(x)
            Next
        Next

Posted 17-Sep-13 21:20pm

Rakesh Meel

Updated 17-Sep-13 21:21pm

v2

Comments

CPallini 18-Sep-13 3:32am

Now could you explain me, please, why are you calling Redim about 50,000,000 times?

[no name] 18-Sep-13 4:28am

Thats common sense and understoodable you can define length as your requirement. ie. 1,10 or 20.

CPallini 18-Sep-13 4:47am

No, that is not common-sense. That makes no sense (*). If you need to initialize an array with say 100 items then you:
(1) Call Redim just one time with the right size.
(2) Initialize with a loop (or whatever) the array items.

(*) Unless your aim is to deliberately waste system resources, of course.

F. Xaver 18-Sep-13 5:15am

CPallini is right!

just redim it once, particularly when you know the dimensions
calling it repeatedly with Preserve is really really extremly slow, especially for large Arrays.