Campbell-scientific CR1000 Measurement and Control System Manual de usuario descargar pdf (Pagina 117)

100

101

Section 7. Installation

117

In this example, a For/Next structure with a changing variable is used to specify

which elements of the array will have the logical operation applied to them. The

CRBasic For/Next function will only operate on array elements that are clearly

specified and ignore the rest. If an array element is not specifically referenced,

e.g., TempC(), CRBasic references only the first element of the array, TempC(1).

CRBasicExample7. UsingaVariableArrayinCalculations

Public TempC(4)

Public TempF(4)

Dim T

BeginProg

Scan(1,Sec,0,0)

Therm107(TempC(),4,1,Vx1,0,250,1.0,0)

For T = 1 To 4

TempF(T) = TempC(T) * 1.8 + 32

Next T

NextScan

EndProg



Dimensions

Some applications require multi-dimension arrays. Array dimensions are

analogous to spatial dimensions (distance, area, and volume). A single-dimension

array, declared as VariableName(x), with (x) being the index, denotes x number

of variables as a series. A two-dimensional array, declared as

Public (or Dim) VariableName(x,y)

with (x,y) being the indices, denotes (x * y) number of variables in a square x-by-

y matrix. Three-dimensional arrays (VariableName (x,y,z), (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 the dimension indices, e.g., CRBasic

example Using variable array dimension indices

(p. 117), declaring the indices As

Long variables is recommended as doing so allows for more efficient use of

CR1000 resources.

CRBasicExample8. UsingVariableArrayDimensionIndices

Dim aaa As Long

Dim bbb As Long

Dim ccc As Long

Public VariableName(4,4,4) As Float

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Campbell-scientific CR1000 Measurement and Control System Manual de usuario Pagina 117

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