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Topic: Multidimensional (2D) Array in C. Date: 12-May-2020. Multidimensional Array: The array which is used to represent and store data in a tabular form is
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spreadsheet which need a two-dimensional array. Two-dimensional (2D) arrays are indexed by two ... Create a 2D array with 3 rows and 4 columns and.
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Thus far you have used one-dimensional arrays to model linear collections of elements. You can use a two-dimensional array to represent a matrix or a table
Programming Excel/VBA Part II (A. Fring)
? Multidimensional arrays are VBA variables which can hold more than one item related to several index sets (up to 60). · e.g. a two dimensional array is a
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Multi-Dimensional Arrays . At this point VBA is aware that myIntegerArray will be an array containing Integers but it doesn't know how large we want it ...
Introduction One-dimensional arrays
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Object Oriented Programming in VBA. • Array Indexing. • 2D Arrays. Textbook(s):. Excel and Excel VBA Programming for Beginners – 3rd Edition for Office 2013
Declare An Array In Vba
Training excel macro vba visual basic array arrays dynamic declare create. One item to a worksheet and multidimensional arrays are using a code then.
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7.5 Two-Dimensional Arrays. 377. 7.6 A Case Study: A Sophisticated Cash Register. 392. Page 1 of 115. Chapter 7. Arrays. 9/12/2013.
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Multidimensional arrays – Dim MyTable(1 To 101 To 10) As Integer • Assignment – MyTable(2)=17 'one dimension – MyTable(34) = 125 'two dimensions
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The opening and closing parenthesis after the variable name are the indicator that myIntegerArray is an array At this point VBA is aware that myIntegerArray
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Les tableaux en VBA le tableau à deux dimensions le tableau dynamique les fonctions Ubound Array Split Join
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Access VBA Made Easy
Arrays and
Collections
08 www.accessallinone.com1 | P a g e
This guide was prepared for AccessAllInOne.com by:Robert Austin
This is one of a series of guides pertaining to the use of Microsoft Access.© AXLSolutions 2012
All rights reserved. No part of this work may be reproduced in any form, or by any means, without permission in writing.2 | P a g e
Contents
Arrays and Collections ................................................................................................... 3
Declaring Arrays ......................................................................................................... 3
Referencing Arrays ..................................................................................................... 5
Fixed Length and Dynamic Arrays ............................................................................. 5
ReDim and Preserve ............................................................................................... 5
Variant Arrays ......................................................................................................... 6
Erasing an Array ......................................................................................................... 7
Split Function ............................................................................................................. 7
Join Function .............................................................................................................. 7
Multi-Dimensional Arrays .......................................................................................... 8
Collections ................................................................................................................ 10
Relationship with Objects ........................................................................................ 10
Properties Associated with Objects .......................................................................... 10
Practical Uses of Collections : Form and Report Controls ....................................... 11Collections: Control. ControlType ........................................................................ 12
Checking if a Form is loaded .................................................................................... 12
Referencing Controls ................................................................................................ 13
Me keyword ........................................................................................................... 13
Full Form Reference ............................................................................................. 13
Sub Form Reference ............................................................................................. 14
Common Errors ........................................................................................................ 14
Not Releasing Memory ............................................................................................. 14
Out of Memory .......................................................................................................... 14
Sloooooow Response Times ..................................................................................... 14
Exception: Out of Bounds ........................................................................................ 14
Questions .................................................................................................................. 15
Answers ..................................................................................................................... 19
3 | P a g e
Arrays and Collections
Computing is all about sets of similar looking data; appointments, files, pictures, addresses, UDP packets, tracks, database records, patient records, library records, lots of records. These different data structures inside our programs, computers, hard-drives and memory will be stored as repeating rows making up arrays and collections. somewhat extended variant. This will lay the foundation for understanding Collections and appreciating the differences between the two structures and be able to choose which best suits your particular task. Traditionally, an Array has always been a block of memory put aside to hold values of a particular type. Its size is set at the time it is initiated and any element within it may be accessed randomly or sequentially. The best way to envisage an Array is like a table of data that is held in memory. A Collection is an object that holds references to other objects of a similar type. It is somewhat similar to an array, in that it holds a list of things, but a collection is normally dynamic in size and, over all, easier to use than an Array. Objects in a collection can also be randomly or sequentially accessed.Declaring Arrays
You can think of an array as a row of boxes with a number on each, 0 to n. When we first declare an array we must at least state its type and may also state its size (we can set the size later if we wish). Firstly, we will create an array that will hold Integer types (whole numbers). 1Dim myIntegerArray() as Integer
myIntegerArray : Array of IntegersFigure 8.1
The opening and closing parenthesis after the variable name are the indicator that myIntegerArray is an array. At this point, VBA is aware that myIntegerArray will be an array In this example we will set the size of the array when we declare it. We will make a 10 integer array. Each Integer takes up 4 bytes. 1Dim myIntegerArray(10) as Integer
myIntegerArray: Array of Integers (0..9)0 1 2 3 4 5 6 7 8 9
0 0 0 0 0 0 0 0 0 0
Figure 8.2
4 | P a g e
indicating the total items it can hold and use a redim statement to set the size later on in the code. 1 2Dim myStringArray() as String
ReDim myStringArray(10)
myStringArray: Array of Strings (0..9)0 1 2 3 4 5 6 7 8 9
Figure 8.3
9%$ LQLPLMOLVHV 6PULQJV PR ³´ MQ HPSP\ 6PULQJB (MŃO ŃOMUMŃPHU RI M VPULQJ PMNHV XS MP OHMVP 2
bytes. 1 2Dim myFloatArray() as Float
ReDim myFloatArray(10)
myFloatArray: Array of Floats (0..9)0 1 2 3 4 5 6 7 8 9
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Figure 8.4
VBA initialises Floats to 0.0. A float takes up 8 bytes. 1 2Dim myDateArray() as Date
ReDim myDateArray (10)
myDateArray: Array of Dates (0..9)0 1 2 3 4 5 6 7 8 9
00:00:00 00:00:00 00:00:00 00:00:00 00:00:00 00:00:00 00:00:00 00:00:00 00:00:00 00:00:00
Figure 8.5
VBA initialises Dates to 00:00:00. A date takes up 8 bytes. 1 2Dim myBooleanArray() as Boolean
ReDim myBooleanArray (10)
myBooleanArray: Array of Boolean (0..9)0 1 2 3 4 5 6 7 8 9
False False False False False False False False False FalseFigure 8.6
VBA initialises Boolean values to False. A Boolean takes up 1 byte.5 | P a g e
Referencing Arrays
Continuing with our row of boxes analogy, an array is referenced by its name and the box we wish to work with. For example, to get the value of box 0 we use myIntegerArray(0); to reference box 9 we use myIntegerArray(9). 3 4 5 6 7 myIntegerArray(0) = 10 myIntegerArray(1) = 36 myIntegerArray(2) = 77 myIntegerArray(4) = 87 myIntegerArray(5) = -10 myIntegerArray: Array of Integers (0..9)0 1 2 3 4 5 6 7 8 9
10 36 77 87 -10 0 0 0 0 0
Figure 8.7
Here are some useful Strings, 10 Top-Level Domains: 3 4 5 6 7 P\6PULQJ$UUM\ 0 ³8.´ P\6PULQJ$UUM\ D ³0(´ P\6PULQJ$UUM\ 1 ³58´ P\6PULQJ$UUM\ 6 ³F20´ P\6PULQJ$UUM\ 2 ³+5´ P\6PULQJ$UUM\ 7 ³H1)2´ P\6PULQJ$UUM\ 3 ³G(´ P\6PULQJ$UUM\ 8 ³1(7´ P\6PULQJ$UUM\ 4 ³)5´ P\6PULQJ$UUM\ E ³(8´ myStringArray: Array of Strings (0..9)0 1 2 3 4 5 6 7 8 9
UK RU HR DE FR ME COM INFO NET EU
Figure 8.8
Fixed Length and Dynamic Arrays
One of the headaches with arrays is that they are static blocks of memory and are not designed to change in size. If we want to add another 5 domain names to myStringArray we have to re-declare the array. Oh, and by the way, doing so usually gives you back a new clean array!ReDim and Preserve
VBA offers the ReDim function which performs much of the leg-work involved in changing array as you change its size. 1 2 3 4 Dim myIntegerArray() as Integer µ GHILQH MUUM\ YMULMNOH ReDim myIntegerArray(10) µ VHP MUUM\ VL]H MQG PHPRU\ MOORŃMPLRQ myIntegerArray(0) = 22 µ VHP 0 PR 22 ReDim Preserve myIntegerArray(20)µ H[PHQG MUUM\ SUHVHUYLQJ 0 22Figure 8.9
The standard ReDim function would destroy the old array and make a new one; with the Preserve keyword included, VBA creates the new array of the new size and copies over the previous arrays values, making them available to us.6 | P a g e
A fixed-length array is what the above arrays are called ± they cannot be changed. A dynamic array is more flexible allowing the array to grow and shrink in size over time without having to recreate the array data and structure.Variant Arrays
Another type of array that VBA implements, is the Variant Array. Variant arrays handle all primitive types and each element of the array can be loaded with any data type. This ŃRQPUMVPV RLPO ³VPMQGMUG´ MUUM\V ROLŃO ŃMQ OROG RQO\ RQH SULPLPLYH GMPM P\SHB Variant arrays handle just like regular arrays, requiring us to ReDim to change the number of variables it can store. 1 2 3 4 5 6 7 8 µ $ YMULMQP MUUM\ ŃMQ OROG MQ\ SULPLPLYH GMPM P\SH NXP LP LVµ MŃPXMOO\ VPRUHG MV MQ RNÓHŃP
Dim myVariableArray As Variant
myVariableArray = Array(10)P\9MULMNOH$UUM\0 ³)LUVP HOHPHQP´
myVariableArray(1) = 2 myVariableArray(2) = new Date(#12-09-1989#)Figure 8.11
7 | P a g e
Erasing an Array
Erasing an array is so important that VBA ± a language that usually makes things easy for programmers ± provides a dedicated function to release memory held by an array. If you scope, but you are advised to explicitly erase array structures when finished with them. Once 1 2 3 4 5 6 7 8Dim myVariableArray() As Variant
ReDim myVariableArray(10)
myVariableArray(0) = 1 myVariableArray(1) = 2 myVariableArray(2) = 3 Erase myVariableArray µ P\9MULMNOH$UUM\ OMV QR PRUH GMPM MQG PXVP NHFigure 8.12
Split Function
The split function splits a string into an array of strings based on some delimiter. The following example demonstrates splitting a string based on spaces. 1 2 3 4 5 6 7 8Sub SplitFunction()
Dim i As Integer
Dim myArray() As String
myArray = Split("here;we;go;again!", ";")For i = LBound(myArray) To UBound(myArray)
Debug.Print myArray(i)
Next i
End Sub
Figure 8.13
Join Function
Join does the exact opposite of split; it requires an array and a delimiter and returns a single string. 1 2 3 4 5Sub JoinFunction()
Dim myArray() As Variant
myArray() = Array("here", "we", "go", "again", "!")Debug.Print Join(myArray(), " ")
End Sub
Figure 8.14
8 | P a g e
Multi-Dimensional Arrays
All the arrays shown above are one-dimensional arrays. It is also possible to create an array with more than one dimension. For example, you may have an array of week numbers with days to hold an Integer number. 1 2Dim myIntegerArray() as Integer
ReDim myIntegerArray(52,7)
Figure 8.15
In the above code, we tell Access to create an array of 364 elements (7×52). In the code below, we create a 3×5 array, fill certain elements with values and print it to the immediate window. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15quotesdbs_dbs17.pdfusesText_23[PDF] multigraph
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