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isnan(3)

LAPACK

isnan(3)

NAME

isnan - isnan: test for NaN

SYNOPSIS

Functions

logical function disnan (din)
DISNAN tests input for NaN. logical function sisnan (sin)
SISNAN tests input for NaN.

Detailed Description

Function Documentation

logical function disnan (double precision, intent(in) din)

DISNAN tests input for NaN.

Purpose:



 DISNAN returns .TRUE. if its argument is NaN, and .FALSE.


 otherwise.  To be replaced by the Fortran 2003 intrinsic in the


 future.

Parameters

DIN



          DIN is DOUBLE PRECISION


          Input to test for NaN.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 58 of file disnan.f.

logical function sisnan (real, intent(in) sin)

SISNAN tests input for NaN.

Purpose:



 SISNAN returns .TRUE. if its argument is NaN, and .FALSE.


 otherwise.  To be replaced by the Fortran 2003 intrinsic in the


 future.

Parameters

SIN



          SIN is REAL


          Input to test for NaN.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 58 of file sisnan.f.

Author

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Sun Jan 12 2025 15:13:37

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