This manual relates to an old release of the Library.
The documentation for the current release is also available on this site.
NAG Library Manual, Mark 27.3
Interfaces:  FL   CL   CPP   AD 
NAG FL Interface Introduction
X01 (Math) Chapter Contents
X01 (Math) Chapter Introduction
x01aa:  FL   CL   CPP   AD 

NAG FL Interface
x01aaf (pi)

NAG Library Manual, Mark 27.3
Interfaces:  FL   CL   CPP   AD 
NAG FL Interface Introduction
X01 (Math) Chapter Contents
X01 (Math) Chapter Introduction
x01aa:  FL   CL   CPP   AD 

▸▿ Contents

© The Numerical Algorithms Group Ltd. 2021
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1 Purpose

x01aaf returns the numerical value of π.

2 Specification

Fortran Interface
Function x01aaf ( x)
Real (Kind=nag_wp) :: x01aaf
Real (Kind=nag_wp), Intent (In) :: x
C Header Interface
#include <nag.h>
double  x01aaf_ (double *x)
The routine may be called by the names x01aaf or nagf_math_pi.

3 Description

None.

4 References

None.

5 Arguments

1: x – Real (Kind=nag_wp) Dummy

6 Error Indicators and Warnings

None.

7 Accuracy

The result should be correct to machine precision (see Chapter X02).

8 Parallelism and Performance

x01aaf is not threaded in any implementation.

9 Further Comments

None.

10 Example

None.
NAG Library Manual, Mark 27.3
Interfaces:  FL   CL   CPP   AD 
NAG FL Interface Introduction
X01 (Math) Chapter Contents
X01 (Math) Chapter Introduction
x01aa:  FL   CL   CPP   AD 
© The Numerical Algorithms Group Ltd. 2021