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Tech Tip: Adding elements into 2D array
PRODUCT: 4D | VERSION: 14.0 | PLATFORM: Mac & Win
Published On: March 7, 2014
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According to the 4D docs, a 2D array can be denoted like: $arr2d{$x}{$y}, where $x is the number of rows, and $y is the number of columns.


  • To add an element to the first row second column, do the following: $arr2d{1}{2}:=1.

  • To add rows into an 2D array, use the following command: INSERT IN ARRAY($arr2D;$x).

  • To add columns into an 2D array, use the following command: APPEND TO ARRAY($arr2d{$x};$y), where $x is the row you want to add a column to.


Below is an example of how to insert values into a 2D array.

C_LONGINT($x;$y)
ARRAY LONGINT($arr2D;0;0)
$x:=1
$y:=1
For ($x;1;10)
  INSERT IN ARRAY($arr2D;$x)
  For ($y;1;5)
    Append To ARRAY($arr2D{$x};$y)
  End For
End for


The end result is a 2D array with 10 rows and 5 columns.