Logical Variables (LOGICAL)

Logical variables are discussed within this section

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LOGICAL

Allowed values for the logical variables are TRUE, FALSE and UNSET. The value is determined by the comparison of two numerical variables (DEF_TYPE = BASE) or by combining several logical variables (DEF_TYPE = BOOLEAN).

The permitted operators for two numerical variables are: GE (= greater or equal than), LE, GT, LT and EQ. The comparison of the two numerical variables, Var1 > Var2, sets the status TRUE, FALSE or UNSET depending on whether Var1 > Var2, Var1 < Var2 or one of the variables is not defined. The status can also be determined with an AND or OR condition using 1 to 4 logical variables. In this way very simple as well as very complex logical variables can be constructed.

Examples

 

(Var1 Δ Var2)

Var1

Var2

Δ = AND

Δ = OR

True

True

True

True

True

False

False

True

False

False

False

False

True

Unset

Unset

True

False

Unset

Unset

False

Unset

Unset

Unset

Unset

In the above table, the result of combination of two logical variables Var1 and Var2 using AND or OR operation is listed for all possible values of Var1 and Var2.

The logical variables are used in SIMULIA Tosca Structure, for example, for the definition of the stop conditions. It is also possible to control the dynamic model modification (in OPT_PARAM) with logical variables.

Logical variables are defined with the LOGICAL command.

If one of the logical variables is UNSET, the second variable in AND operation is ignored, see the above figure.