Campbell CR800 Series, Operator'S Manual

Page: 132 / 598

Section 7. Installation
132
with (x,y,z) being the indices, have (x • y • z) number of variables in a cubic x-by-
y-by-z matrix. Dimensions greater than three are not permitted by CRBasic.
When using variables in place of integers as dimension indices (see CRBasic
example
Using Variable Array Dimension Indices
(p. 132))
, declaring the indices As
Long variables is recommended. Doing so allows for more efficient use of
CR800 resources.
Using Variable Array Dimension Indices
'This program example demonstrates the use of dimension indices in arrays. The variable
'VariableName is declared with three dimensions with 4 in each index. This indicates the
'array has means it has 64 elements. Element 24 is loaded with the value 2.718.
'
Dim aaa As Long
Dim bbb As Long
Dim ccc As Long
Public VariableName(4,4,4) As Float
BeginProg
Scan (1,sec,0,0)
aaa = 3
bbb = 2
ccc = 4
VariableName(aaa,bbb,ccc) = 2.718
NextScan
EndProg
7.6.3.3.3 Dimensioning String Variables
Strings can be declared to a maximum of two dimensions. The third "dimension"
is used for accessing characters within a string. See String Operations
(p. 303).
String length can also be declared. See table
Data Types in Variable Memory.
(p.
127)
A one-dimension string array called StringVar , with five elements in the array
and each element with a length of 36 characters, is declared as
Public StringVar(5) As String * 36
Five variables are declared, each 36 characters long:
StringVar(1)
StringVar(2)
StringVar(3)
StringVar(4)
StringVar(5)
7.6.3.3.4 Declaring Flag Variables
A flag is a variable, usually declared As Boolean
(p. 491),
that indicates True or
False, on or off, go or not go, etc. Program execution can be branched based on
the value in a flag. Sometime flags are simply used to inform an observer that an
event is occurring or has occurred. While any variable of any data type can be
used as a flag, using Boolean variables, especially variables named "Flag", usually