nanp

Arguments: object

Returns true if object is a floating-point nan. Returns nil otherwise.

The actual value when true should not be depended upon, beyond its not being nil. The actual value may change in a new release or in an update without notice.

See also exceptional-floating-point-number-p and infinityp and the section on Floating-point infinities and NaNs, and floating-point underflow and overflow in implementation.htm.

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This page is new in the 8.2 release.
Created 2016.6.21.