Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 117

Section 7. Installation 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. Public TempC(4) Public TempF(4) Dim T Using a Variable Array in Calculations 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-byy 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 117