NAG Library Manual, Mark 27
Interfaces:  FL   CL   CPP   AD 
NAG FL Interface Introduction
X07 (Ieee) Chapter Contents
X07 (Ieee) Chapter Introduction
x07ba:  FL   CL   CPP   AD 

NAG FL Interface
x07baf (create_​infinity)

NAG Library Manual, Mark 27
Interfaces:  FL   CL   CPP   AD 
NAG FL Interface Introduction
X07 (Ieee) Chapter Contents
X07 (Ieee) Chapter Introduction
x07ba:  FL   CL   CPP   AD 

▸▿ Contents

© The Numerical Algorithms Group Ltd. 2019

1 Purpose

x07baf creates a signed infinite value.

2 Specification

Fortran Interface
Subroutine x07baf ( isign, x)
Integer, Intent (In) :: isign
Real (Kind=nag_wp), Intent (Out) :: x
C Header Interface
#include <nag.h>
void  x07baf_ (const Integer *isign, double *x)
The routine may be called by the names x07baf or nagf_ieee_create_infinity.

3 Description

x07baf sets x to be positive or negative infinity.

4 References

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

5 Arguments

1: isign – Integer Input
On entry: determines the sign of the infinity to be created.
If isign is greater than or equal to 0, a positive infinity is returned, otherwise a negative infinity is returned.
2: x – Real (Kind=nag_wp) Output
On exit: the required infinite value.

6 Error Indicators and Warnings

None.

7 Accuracy

Not applicable.

8 Parallelism and Performance

x07baf is not threaded in any implementation.

9 Further Comments

None.

10 Example

See Section 10 in x07aaf.
NAG Library Manual, Mark 27
Interfaces:  FL   CL   CPP   AD 
NAG FL Interface Introduction
X07 (Ieee) Chapter Contents
X07 (Ieee) Chapter Introduction
x07ba:  FL   CL   CPP   AD 
© The Numerical Algorithms Group Ltd. 2019