4D v13.4
ARRAY BOOLEAN
- 4D Language Reference
-
- Arrays
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- Arrays
- Creating Arrays
- Arrays and Form Objects
- Arrays and the 4D Language
- Arrays and Pointers
- Using the element zero of an array
- Two-dimensional Arrays
- Arrays and Memory
- APPEND TO ARRAY
- ARRAY BOOLEAN
- ARRAY DATE
- ARRAY INTEGER
- ARRAY LONGINT
- ARRAY PICTURE
- ARRAY POINTER
- ARRAY REAL
- ARRAY STRING
- ARRAY TEXT
- ARRAY TO LIST
- ARRAY TO SELECTIONUpd
- BOOLEAN ARRAY FROM SET
- COPY ARRAY
- Count in array
- DELETE FROM ARRAY
- DISTINCT VALUES
- Find in array
- INSERT IN ARRAY
- LIST TO ARRAY
- LONGINT ARRAY FROM SELECTION
- MULTI SORT ARRAY
- SELECTION RANGE TO ARRAYUpd
- SELECTION TO ARRAYUpd
- Size of array
- SORT ARRAY
- TEXT TO ARRAYNew
ARRAY BOOLEAN
| ARRAY BOOLEAN ( arrayName ; size {; size2} ) | ||||||||
| Parameter | Type | Description | ||||||
| arrayName | Array |
|
Name of the array | |||||
| size | Longint |
|
Number of elements in the array or Number of rows if size2 is specified | |||||
| size2 | Longint |
|
Number of columns in a two-dimensional array | |||||
The ARRAY BOOLEAN command creates and/or resizes an array of Boolean elements in memory.
The arrayName parameter is the name of the array.
The size parameter is the number of elements in the array.
The size2 parameter is optional; if size2 is specified, the command creates a two-dimensional array. In this case, size specifies the number of rows and size2 specifies the number of columns in each array. Each row in a two-dimensional array can be treated as both an element and an array. This means that while working with the first dimension of the array, you can use other array commands to insert and delete entire arrays in a two-dimensional array.
While applying ARRAY BOOLEAN to an existing array:
- If you enlarge the array size, the existing elements are left unchanged, and the new elements are initialized to False.
- If you reduce the array size, the last elements deleted from the array are lost.
Tip: In some contexts, an alternative to using Boolean arrays is using an Integer array where each element “means true” if different from zero and “means false” if equal to zero.
This example creates a process array of 100 Boolean elements:
ARRAY BOOLEAN(abValues;100)This example creates a local array of 100 rows of 50 Boolean elements:
ARRAY BOOLEAN($abValues;100;50)This example creates an interprocess array of 50 Boolean elements and sets each even element to True:
ARRAY BOOLEAN(◊abValues;50)
For($vlElem;1;50)
◊abValues{$vlElem}:=(($vlElem%2)=0)
End for
Product: 4D
Theme: Arrays
Number:
223
Created: < 4D v6
