Array 1D - 2D, i'm confused

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```#include <Array.au3>

Local \$aArray1D[3] = [1, 2, 3]
Local \$aArray2D[3][3] = [[1, 2, 3],[2, 3, 4],[3, 4, 5]]

ReDim \$aArray2D[3][1]
_ArrayDisplay(\$aArray1D)
_ArrayDisplay(\$aArray2D)

ReDim \$aArray2D[3]
_ArrayDisplay(\$aArray2D)```

The first ReDim, from what i see \$aArray1D and \$aArray2D are equal. So why if i'll try to ReDim the 2D in 1D i lost the data? There is a way to convert a 2D array to 1D without loop and having only the value like the 1D one?

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MyEarth,

Although the 2 arrays look identical, they are in fact very different. A 1D array is perhaps best thought of as a simple list, whereas a 2D array can be thought of as a grid with a variable number of columns. If you look at the bottom left of each _ArrayDisplay dialog you will see that the arrays are different ([3] for the 1D and [3][1] for the 2D).

As you have discovered, you cannot change the number of dimensions with ReDim and retain the existing data - mainly because of the way AutoIt stores the data for the 2 types of array - although you can change the number of rows/columns within each dimension.

However, there is a way to get a 2D array into a 1D array - just use _ArrayColDelete to delete the unwanted columns and set the \$bConvert parameter to True:

```#include <Array.au3>

Local \$aArray2D[3][3] = [[1, 2, 3],[4, 5, 6],[7, 8, 9]]

_ArrayColDelete(\$aArray2D, 1, True)
_ArrayColDelete(\$aArray2D, 1, True)
_ArrayDisplay(\$aArray2D)```

How does that work for you?

M23

Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

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Hi,

_ArrayColDelete work but will loop everything. I know the array are different [3] and [3][1] but they not both store the information in the same index? So in theory ReDim, since the index is the same, need to store the information not delete them...i think

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You think incorrectly. If using ReDim to convert a 2D to a 1D array, you WILL lose the information in the array. The help file explains this. Whether you'd like it to work that way or not isn't a valid point, because it doesn't work that way.

If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
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MyEarth,

As I explained above, you cannot change the number of dimensions with ReDim and also retain the existing data. Once again: 1D and 2D arrays are not the same and \$aArray1D[1] is not the same as \$aArray2D[1][0] as (to the best of my knowledge) AutoIt stores the data internally in a completely different manner.

M23

Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

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