next up previous contents index
Next: .param Line Up: Parameters and Expressions Previous: Parameters and Expressions   Contents   Index


Single-Quoted Expressions

Text enclosed in single quotes (') will be evaluated as an expression as the file is read and the string will be replaced by the result. Single-quoted expressions outside of .subckt blocks are expanded before variable substitution and subcircuit expansion. In this case, since evaluation is performed before shell substitution, the expression can not contain shell variables or other `$' references, but it can contain vectors (which must be defined before the circuit is read). Single-quoted expressions that appear within .subckt blocks are evaluated after variable substitution during subcircuit expansion. Thus, these expressions can contain shell '$' constructs.

If the single-quoted expression appears to the left of an '=' sign, as an assignment, no substitution is done. In this case, the quotes are ignored.



Stephen R. Whiteley 2006-10-23