# sisnan.f man page

sisnan.f —

## Synopsis

### Functions/Subroutines

LOGICAL functionsisnan(SIN)SISNANtests input for NaN.

## Function/Subroutine Documentation

### LOGICAL function sisnan (realSIN)

**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.

**Date:**

September 2012

Definition at line 60 of file sisnan.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

sisnan(3) is an alias of sisnan.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK