# Deleting blanks from 2D arrays

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New to this, so if its out there I couldn't find it.

Did see topic regarding 1D array.

looking to code the most efficient way to delete blanks from 2D array.

this is what I thought would work, but please shoot holes in it but do so with comments that would allow me to understand what and why.

Thanks.

Array:

col 0   col1   col2

abc     efg    123

blank blank blank

hij      456   xyz

```For \$i = UBound(\$aArray1) - 1 To 0 Step -1
\$j = ""
If \$aArray1[\$i] [\$j] = "" Then
_ArrayDelete(\$aArray1, \$i)
EndIf
Next

;looking for the simplest yet efficient way of doing this
;the entire row has to be blank before any deletion should occur.
;wasn't sure what to do about \$j as for a loop. got errors.```

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Stoex,

This works for me:

```#include <Constants.au3>
#include <Array.au3>

Global \$aArray[4][3] = [["col 0", "col1", "col2"], ["abc", "efg", "123"], ["", "", ""], ["hij", "", "xyz"]]

For \$i = UBound(\$aArray, \$UBOUND_ROWS) - 1 To 0 Step -1
; Create a blank variable
\$sTemp = ""
For \$j = 0 To UBound(\$aArray, \$UBOUND_COLUMNS) - 1
; Add each of the elements in the row
\$sTemp &= \$aArray[\$i][\$j]
; If it contains something then ignore this row
If \$sTemp <> "" Then ContinueLoop 2
Next
; There was nothing at all in that row
_ArrayDelete(\$aArray, \$i)
Next

_ArrayDisplay(\$aArray, "", Default, 8)```

M23

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

Open spoiler to see 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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And if you get an error -like I did- just use this

```For \$i = UBound(\$aArray) - 1 To 0 Step -1
; Create a blank variable
\$sTemp = ""
For \$j = 0 To UBound(\$aArray, 2) - 1
;... etc```

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mikell,

Best use the Beta - you know how guinness HATES "magic numbers"!

M23

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

Open spoiler to see 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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A true const-mania

At least let us write codes able to work with the releases

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These Const are ridiculous. How are you going to name the 16 - 2 = 14 next possible dimensions?

The parameter is an integer denoting the dimension index.

My (late) \$0.02

This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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Hurray!

Added obfuscation. 'Rows' is not a suitable description for the dimension of an array. It's good for tables and that's about as far as it goes.

Edited by czardas

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These Const are ridiculous. How are you going to name the 16 - 2 = 14 next possible dimensions?

The parameter is an integer denoting the dimension index.

My (late) \$0.02

...and what would you suggest?

A true const-mania

At least let us write codes able to work with the releases

I am not forcing you to use constants, but I prefer readable code over...going back and forth to the help file. Edited by guinness

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Without _ArrayDelete :

```#include <Constants.au3>
#include <Array.au3>

Local \$aArray[4][3] = [["col 0", "col1", "col2"], ["abc", "efg", "123"], ["", "", ""], ["hij", "", "xyz"]]
Local \$iCount = 0, \$sTemp

For \$i = 0 To UBound(\$aArray, 1) - 1
\$sTemp = ""
For \$j = 0 To UBound(\$aArray, 2) - 1
\$aArray[ \$iCount][\$j] = \$aArray[\$i][\$j]
\$sTemp &= \$aArray[\$i][\$j]
Next

If \$sTemp <> "" Then  \$iCount += 1
Next

Redim \$aArray[ \$iCount][UBound(\$aArray, 2) ]
_ArrayDisplay(\$aArray)```

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Guinness - 1st dimension, 2nd dimension 3rd dimension etc... ==> no constants needed.

The 'number of dimensions' could be a named constant, if you really think it's necessary (the number zero is not descriptive). The numbers 1, 2, 3 etc... are not really magic numbers. They are just numbers - nothing more, nothing less. Changing them is counter-intuitive, or ridiculous as jchd puts it.

In any case, magic numbers have their place, although it doesn't apply here.

Edited by czardas

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For the new user 2nd dimension doesn't really say much.

Anyhow I am not working on AutoIt so someone else will have to change it.

Edited by guinness

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If a user is unable to understand the term 'second dimension', they really need to learn some elementary maths terminology before learning about multidimensional arrays. If a person is new to programming; then clear, descriptive, consistent and correct terminology will be an enormous asset to them. Things have improved a lot regarding this - much thanks to you. I seem to remember a time when the Help file said something about the 0th dimension. I fell off my chair laughing - an inappropriate theoretical concept used to describe a real world item.

Edited by czardas

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Thanks to everybody.

As a newbie I'm amazed at the wealth of knowledge all of you have.

btw - not sure if i clicked the "mark solved" button in the right manner, but MY problem was resolved thanks to everyone's code input so I clicked all of them and now think it must mean a particular response.  Any way you all helped me.

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Ok, just dropped the solutions into test file of 1500 records.

The code by jguinch processed much faster.  Just looking at how fast Array displays on screen (before and after), did not use timer.

So as a beginner, can either author lend some comment on this?

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gunness - I think I was being over critical about the constants. It's not something I would have included but perhaps it's not such a bad thing for beginners after all.

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