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Designer File Formats > Evaluation of ExpressionsWith two exceptions, an expression is evaluated once at the beginning of simulation and the resulting value is used thereafter. The two exceptions are expressions in sweep specifications and expressions in the instance statements for behavioral devices. An expression in a sweep specification (see Variable Sweeps) is evaluated once on every sweep step. Note that an expression in one level of a multi-level sweep cannot depend either on a sweep value that is set in another level of the same sweep, or on a value that is set in any level of another sweep statement. An expression that determines the value of a behavioral device such as an expression-based resistor or behavioral voltage source is evaluated continuously, that is, on every Newton-Raphson iteration and every step of a discrete-time simulation. A .OPTION statement cannot contain an expression.
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