Expression

A mathematical expression which can be executed. The result of an expression is either assigned to a variable or used in the OE trial command as the condition for actions. See appendix for syntax and valid commands.

Expressions may include variables or parameters defined at the ERTS script level. Variable names must be led by ‘@’ symbol to identify them as ERTS Variables or Parameters. You can also define placeholders without a variable name ‘@?’ and insert any text via variable arguments at the trial level as part of the OE trial command.

Any variable name which has not been defined by a VARIABLE command, will be instantiated automatically as a local variable which only exist for the duration of the execution of the expression block.