Not A Number/Path/Refnum? Function

LabVIEW 2013 Help

Edition Date: June 2013

Part Number: 371361K-01

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Owning Palette: Comparison Functions

Requires: Base Development System

Returns TRUE if number/path/refnum is not a number (NaN), <Not a Path>, or not a refnum. Otherwise, this function returns FALSE.

Use this function to make sure a reference to an object, such as a VI, application, or control, still resides in system memory and was not closed.

The connector pane displays the default data types for this polymorphic function.


number/path/refnum can be a scalar number, path, or refnum, or it can be a cluster or array of numbers, paths, or refnums.
NaN/Path/Refnum? is a Boolean value of the same data type structure as number/path/refnum.

Not A Number/Path/Refnum? Details

This function works only on references generated by LabVIEW functions. Do not use this function to determine the validity of a rendezvous refnum, semaphore refnum, or any refnum created by the GOOP wizard, LabVIEW Database Connectivity Toolkit, or LabVIEW Internet Toolkit. For rendezvous refnums, use the Not A Rendezvous VI. For semaphore refnums, use the Not A Semaphore VI. For all other GOOP refnums or toolkit refnums, use the VIs defined by the refnum creator.


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