f$IsUndef (f$IstUndef)
f$IsUndef (f$IstUndef)
Verification of a parameter for its UNDEF state.
Please note: the parameter name is usually given as string constants, i.e. in quotation marks. If a string parameter is entered - like in the syntax description - then the value of the parameter entered is considered as the parameter name (as long as it is a string).
Syntax: | IsUndef = f$IsUndef( ParaName ) | ||
| Argument | Type | Meaning |
| ParaName | String | Parameter to be inspected for UNDEF |
Result: | Logical | true (1) for parameter value UNDEF, otherwise false (0) | |
Example: | TestRes = f$IsUndef( 'Ident' ) → TestRes = 1 | ||