Error Messages/40616
Error Message Examples
You cannot assign to a slice or subscript of a global variable object.
Cause
You are trying to assign a value to a slice (subscripted element) of a global variable. This is not permitted, since it would contravene Analytica's general principle of no side-effects. You may assign to a slice of a local variable.
This example triggers this error. Here Object2 is assigning to a slice of the global variable object, Object1.
Definition of Index1:
1..9
Definition of Object1:
Table(Index1)(7, 8, 3, 2, 5, 4, 9, 1, 5)
Definition of Object2:
Object[Index1 = 5] := 6
Remedies
You may assign to a global variable in a Button script or in a Function called from a Button script Scripts and Buttons, directly or indirectly. The rationale is that this does not violate the No-side effects principle because clicking a button means the user is causing the effect directly.
You can often work around this issue by copying the global array into a local, assigning to a slice of the array, and then assigning the local back to the global within a function called from a Button script. For example, suppose you want to assign 999 to the 10th element over I of global variable X. If you define a variable
Variable TrytoAssignX := X[I=10] := 999
it will give the error above. So instead define
Function AssigntoX(v)
Definition: Variable local_X:= X;
local_X[i=10] := v;
X := local_X
Button Assign_to_X
Script: Assign_to_X(999)
When you press the button, it will call Assign_to_X(999) and make the assignment.
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