NAG Library Routine Document

X07ABF

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X07ABF determines whether a floating-point number is a NaN (Not A Number).

FUNCTION X07ABF ( X)

LOGICAL X07ABF

REAL (KIND=nag_wp) X

X07ABF returns .TRUE. if and only if X is a NaN, and returns .FALSE. otherwise.

IEEE (2008) Standard for Floating-Point Arithmetic IEEE Standard 754-2008 IEEE, New York.

1: X – REAL (KIND=nag_wp)Input: On entry: the number whose status is to be determined.

None.

Not applicable.

None.

See Section 9 in X07AAF.